IDCC


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue
us-gaap:StatementEquityComponents
us-gaap:SharesOutstanding
us-gaap:StatementEquityComponents
us-gaap:SharesIssued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:EarningsPerShareBasic
us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:EarningsPerShareDiluted

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:CostsAndExpenses

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaid
us-gaap:IncomeTaxAuthority

us-gaap:InterestExpense

us-gaap:InterestExpenseDebt
us-gaap:BusinessAcquisition
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
dei:LegalEntity
us-gaap:StatementEquityComponents

us-gaap:OperatingIncomeLoss

us-gaap:OtherIncome

us-gaap:ProfitLoss

us-gaap:ResearchAndDevelopmentExpense

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ContractWithCustomerBasisOfPricing
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:ContractWithCustomerDuration

us-gaap:Revenues

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:Assets
us-gaap:ConsolidatedEntities

us-gaap:Liabilities
us-gaap:ConsolidatedEntities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:CashAndCashEquivalents
us-gaap:ConsolidatedEntities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:FinancialInstrument

us-gaap:ShortTermInvestments

us-gaap:OtherAssetsCurrent
us-gaap:Restatement

us-gaap:PrepaidExpenseAndOtherAssetsCurrent
us-gaap:Restatement

us-gaap:MachineryAndEquipmentGross
us-gaap:StatementGeographical
us-gaap:NoncurrentAssets
us-gaap:StatementGeographical, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AssetsNoncurrent

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:FurnitureAndFixturesGross

us-gaap:LeaseholdImprovementsGross

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:LongTermInvestments

us-gaap:Goodwill
us-gaap:Restatement

us-gaap:OperatingLeaseRightOfUseAsset
us-gaap:BalanceSheetLocation
us-gaap:Restatement

us-gaap:OtherAssetsNoncurrent
us-gaap:ConsolidatedEntities
us-gaap:Restatement

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:LiabilitiesCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent
us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:LongtermDebtType
us-gaap:LongTermDebt
us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:LongTermDebtNoncurrent
us-gaap:LongtermDebtType

us-gaap:MinorityInterest

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:CumulativeEffectPeriodOfAdoption
us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:TreasuryStockValue

us-gaap:MinorityInterest

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:AmortizationOfFinancingCosts
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ProfitLoss

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsOfDividends

us-gaap:Dividends
us-gaap:StatementEquityComponents

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:ProceedsFromSaleOfShortTermInvestments

idcc:CapitalizedPatentCosts

idcc:DilutiveSecuritiesEffectOnBasicEarningsPerSharePerShare

idcc:DiscreteTaxExpenseBenefit

idcc:IncreaseDecreaseInCapitalAndIntangibleAssetExpendituresIncurredButNotYetPaid

idcc:IncreaseDecreaseInDisaggregatedRevenue
us-gaap:ContractWithCustomerBasisOfPricing
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:ContractWithCustomerDuration

idcc:IncreaseDecreaseInInterestAndInvestmentIncome

idcc:IncreaseDecreaseinDisaggregatedRevenue
us-gaap:ProductOrService

idcc:NonCashChangeinFairValue

idcc:PatentAdministrationAndLicensing

idcc:PercentageIncreaseDecreaseInDisaggregatedRevenue
us-gaap:ContractWithCustomerBasisOfPricing
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:ContractWithCustomerDuration

idcc:PercentageIncreaseDecreaseinDisaggregatedRevenue
us-gaap:ProductOrService

idcc:RestructuringAndRelatedActivitiesReimbursementArrangements

idcc:UnsettledRepurchasesOfCommonStock

us-gaap:AmortizationOfDebtDiscountPremium
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:AmortizationOfFinancingCostsAndDiscounts
us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationIntegrationRelatedCosts

us-gaap:CommonStockDividendsPerShareDeclared
us-gaap:MajorCustomers, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:ConcentrationRiskPercentage1

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:DividendsCommonStockCash

us-gaap:EquitySecuritiesFvNiUnrealizedGain

us-gaap:GainLossOnSaleOfInvestments

us-gaap:ImpairmentOfIntangibleAssetsExcludingGoodwill
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:IncreaseDecreaseInAccruedTaxesPayable

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInDeferredRevenue

us-gaap:IncreaseDecreaseInOtherAccruedLiabilities

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInReceivables

us-gaap:InterestAndOtherIncome

us-gaap:InterestExpenseDebtExcludingAmortization
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:OtherOperatingIncomeExpenseNet

us-gaap:OtherRestructuringCosts

us-gaap:PaymentsForProceedsFromLongtermInvestments

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsToAcquireShortTermInvestments

us-gaap:PaymentsToMinorityShareholders

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:RestructuringCostsAndAssetImpairmentCharges

us-gaap:SeveranceCosts1
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockSharesAcquired

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment
us-gaap:ConsolidatedEntities
idcc:AccountsReceivableAfterAllowanceForCreditLossAndPrepaidAssets

idcc:ComputerEquipmentAndSoftwareGross
us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:LongtermDebtType
idcc:DebtIssuanceCostsEquityComponent
us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

idcc:DeferredTaxAssetAmortizationOfIntangibles

idcc:DeferredTaxAssetLiabilityDepreciationNet

idcc:DeferredTaxAssetOTTI

idcc:DeferredTaxAssetOperatingLeaseLiability

idcc:DeferredTaxAssetsForeignTaxWithholding

idcc:DeferredTaxAssetsLiabilitiesOtherNet

idcc:ErrorCorrectionAdjustmentTaxReceivablesAsAPercentOfTotalAssets

idcc:FiniteLivedPatentsNet
us-gaap:ConsolidatedEntities
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:LitigationCase, us-gaap:LitigationStatus, us-gaap:SubsequentEventType
idcc:LossContingencyNumberOfPatentsAllegedInfringement

idcc:MinimumExercisePricePerCommonShareOptions

idcc:OperatingLeaseLiabilityExcludingPrepaidReceivable

idcc:OperatingLeaseReceivable
us-gaap:Restatement

idcc:ProceedsFromStockOptionsIfExercised

idcc:ReceivableFromSaleOfLongTermInvestmentsCurrent

idcc:UnsettledRepurchaseOfCommonStock

us-gaap:AccountsPayableCurrentAndNoncurrent

us-gaap:AccountsReceivableNet
us-gaap:ConsolidatedEntities

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:BalanceSheetLocation
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument

us-gaap:BuildingsAndImprovementsGross

us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:CashAndCashEquivalents
us-gaap:CashAndCashEquivalents, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument

us-gaap:CommercialPaper
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:InvestmentType

us-gaap:ContractWithCustomerAssetNetCurrent

us-gaap:ContractWithCustomerAssetNetNoncurrent

us-gaap:ContractWithCustomerLiabilityNoncurrent
us-gaap:LongtermDebtType
us-gaap:ConvertibleDebt

us-gaap:DebtInstrumentCarryingAmount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentInterestRateEffectivePercentage
us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentUnamortizedDiscount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

us-gaap:DeferredFinanceCostsGross
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DeferredFinanceCostsNet
us-gaap:LongtermDebtType

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredTaxAssetsDeferredIncome

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
us-gaap:BusinessAcquisition
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:BusinessAcquisition
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:BusinessAcquisition
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:BusinessAcquisition
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:BusinessAcquisition
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:BusinessAcquisition
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:BusinessAcquisition
us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsAccumulatedBenefitObligation
us-gaap:BusinessAcquisition
us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation

us-gaap:DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsCurrent

us-gaap:DividendsPayableCurrentAndNoncurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
us-gaap:MajorCustomers, us-gaap:FairValueByAssetClass
us-gaap:FiniteLivedIntangibleAssetsFairValueDisclosure
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedPatentsGross

us-gaap:IncomeTaxReceivable

us-gaap:IncomeTaxesReceivable
us-gaap:Restatement

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
us-gaap:BusinessAcquisition
us-gaap:LongTermDebtFairValue
us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards

us-gaap:OtherAccruedLiabilitiesCurrentAndNoncurrent

us-gaap:OtherAssetsMiscellaneousNoncurrent
us-gaap:Restatement

us-gaap:OtherLongTermInvestments
us-gaap:Restatement

us-gaap:PrepaidExpenseCurrent
us-gaap:Restatement

us-gaap:PurchaseObligationDueInNextTwelveMonths

us-gaap:RestrictedCash

us-gaap:RestrictedCashCurrent

us-gaap:RestrictedCashNoncurrent

us-gaap:RestructuringReserve

us-gaap:RevenueRemainingPerformanceObligation
us-gaap:BusinessAcquisition
us-gaap:SeniorNotes
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber

us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

us-gaap:StockholdersEquityBeforeTreasuryStock

us-gaap:TaxesPayableCurrentAndNoncurrent

us-gaap:TreasuryStockCommonShares

us-gaap:UnamortizedDebtIssuanceExpense

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance

Plots across concepts


IncomeStatement
Income Loss From Continuing Operations 
Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
Expenses
Income Tax Expense Benefit
Balance Sheet
Operating Lease Right Of Use Asset
Assets
Property Plant And Equipment Net
Current Assets
Other Assets Current
NonCurrent Assets
Property Plant And Equipment Net
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Dividends Payable Current And Noncurrent
Current Liabilities
Operating Lease Liability Current
Noncurrent Liabilities
Minority Interest
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
Per Share
Earnings Per Share Diluted
CashFlow
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInInvestingActivities
Payments To Acquire Property Plant And Equipment
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
DividendsAndRepurchase
Payments For Repurchase Of Common Stock
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Next Twelve Months

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockValue █▆▆▃▃▃▁▁0.7150.7140.7140.7130.7130.7130.7120.712NANA0.711NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA0.6890.686NANANA
 us-gaap:SharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStockNANANA71.37971.37771.32271.26871.26771.2671.2571.13471.11771.05970.95770.749NANANA70.318NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:SharesOutstanding us-gaap:StatementEquityComponents us-gaap:TreasuryStockNANANA40.57340.57340.573-40.56740.13440.13439.1937.60536.67536.25136.21136.127NANANA-36.02NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:SharesIssued us-gaap:StatementEquityComponents us-gaap:CommonStock█▄▁71.58871.47671.389NA71.37771.32271.268NANANA71.134NANANA70.749NANANANANANANANANANANANANANANANANANANANANANANANANANANA68.602NANANA
 us-gaap:SharesIssued us-gaap:StatementEquityComponents us-gaap:TreasuryStock█▅▁40.74640.66440.573NA40.57340.57340.567NANANA37.605NANANA36.127NANANANANANANANANANANANANANANANANANANANANANANANANANANA23.57NANANA
us-gaap:CommonStockSharesIssued ██▇▇▇▇▇▇▇▇▆▆▆▆▅▅▅▅▃▃▃▃▂▂▂▂▁71.58871.47671.38971.37971.37771.32271.26871.26771.2671.2571.13471.11771.05970.95770.74970.7370.72970.69970.31870.30370.26970.24970.1370.12470.11870.05869.8NANA69.7869.614NA69.5969.3569.45969.3569.34169.29369.11869.06268.96868.91768.602NA68.602NA
us-gaap:CommonStockSharesOutstanding ▁▁▁▁▁▁▁▁▁▃▄▅▆▆▅▆▆▅▅▅▅▅▆▆▇▇█30.84230.81230.81630.80630.80430.74930.70131.13331.12632.0633.52934.44234.80834.74634.62234.7134.70934.67934.29834.28234.35134.66335.41435.55535.92136.22636.92NANA40.45440.288NA41.1840.9441.0540.9443.38445.06245.54845.49245.39845.34745.032NA45.032NA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█31.18931.195NA31.11931.04530.92NA31.30831.77632.611NA35.60735.63135.606NA35.38835.90236.22NA34.95334.94535.377NA36.20536.44237.329NA40.19140.82240.444NA41.44841.45641.138NA42.35344.13945.946NA46.28145.84345.872NA44.81144.70644.383
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁█30.80430.836NA30.80430.75730.722NA31.1331.54732.611NA34.65134.76934.641NA34.70934.68634.37NA34.2834.49935.045NA35.79836.02236.954NA39.6240.44340.444NA41.18541.16141.138NA42.02443.87645.401NA45.46345.36945.306NA44.07643.97143.614
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount ▁█4.9515.041NA10.39611.41212.796NA12.67510.1259.282NA4.483NANANANANANANANANANANANANANANANANANANANANANANANANANANANA0.00.0NANA0.1NA
us-gaap:EarningsPerShareBasic ▁▂▁▂▂▁▂▁▂▁▁▂▂▂▃▃▃▃▆▅▃▂▂▂▂▂▂▂▄▁▂▂▂▁▂█▂▂▂▂▂▂▂▂▂▃0.050.18-0.040.770.720.00.440.070.25-0.090.050.620.310.861.521.021.510.983.983.051.160.80.930.680.910.790.370.341.95-0.050.350.650.22-0.30.385.610.220.240.50.580.380.520.770.810.81.12
 us-gaap:EarningsPerShareBasic us-gaap:AdjustmentsForNewAccountingPronouncements us-gaap:AccountingStandardsUpdate2020060.09NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareDiluted ▁▂▁▂▂▁▂▁▂▁▁▂▂▂▃▃▃▂▆▅▃▂▂▂▂▂▂▂▄▁▂▂▂▁▂█▂▂▂▂▂▂▂▂▂▃0.050.18-0.040.760.720.00.440.070.24-0.090.050.60.30.841.481.01.460.933.852.991.140.790.920.680.890.780.360.341.93-0.050.350.640.22-0.30.385.560.220.240.490.570.370.510.760.790.781.1
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:ComprehensiveIncomeNetOfTax ▁▁▁▂▂▁▂▁▂▁▁▂▂▂▃▂▃▂▅▄▂▂▂▂▂▂▂▂▄▁▂▂▂▁▂█▂▂▂▂▂▂▂▂▂1.5495.501-1.54223.42222.6630.14813.7852.4798.819-1.758-1.59821.87411.08228.17847.53535.44252.45733.711132.411104.2840.13828.32330.03524.38832.61529.0611.15412.97679.671-2.24911.88625.7029.331-12.11415.389236.3789.67311.66722.75725.73317.07723.35134.13835.48235.03NA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest ▁██▇█▇▇█████-8.415-1.613-1.541-1.882-1.66-1.777-1.802-1.399-1.365-1.411-1.223-1.642NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▁▁▁▂▂▁▂▁▂▁▂▂▂▂▃▂▃▂▅▄▂▂▂▂▂▂▂▂▄▁▂▂▂▁▂█▂▂-6.8663.888-3.08321.5421.003-1.62911.9831.087.454-3.1696.21820.57710.15226.98253.85834.63151.50232.733138.76103.33739.17327.40334.97823.65631.96828.32716.43612.09978.882-2.94316.18425.1528.699-12.74815.389236.3789.67311.667NANANANANANANANA
us-gaap:CostsAndExpenses █▅█▆▆▅▆▅▅▅▅▄▃▄▄▃▃▄▅▃▃▄▄▃▄▄▄▄▅▄▄▄▃▄▅▅▃▃▂▂▁▁▂▁▁90.88470.37487.6572.06372.58171.52976.86568.74966.69468.78171.48162.15953.87557.29459.656.4554.83160.56264.71951.58952.83259.40858.75855.02159.97359.13460.83362.28165.86257.88561.70361.49555.062.40769.04570.79154.29749.941.46544.30240.06641.15241.63537.45238.079NA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▁▂▁▂▂▁▂▁▂▁▁▁▂▂▄▂▃▂▅▄▂▂▂▂▂▂▂▂▄▁▂▂▂▁▂█▂▂▂▂▂▂▂▂▂▃-6.7765.723-3.669.05925.7350.15919.9360.65711.362-6.013-1.556-1.03310.83323.814143.9338.68878.61831.154205.755152.9222.37741.21946.89637.27950.83246.00820.58912.174124.77-4.00524.27446.17815.591-24.52416.362360.51115.0916.67132.81429.00426.42636.36454.17655.02753.96375.281
us-gaap:IncomeTaxExpenseBenefit ▂▂▂▁▂▂▂▂▂▂▂▁▂▂▆▂▃▂▅▄▁▃▃▃▃▃▂▂▄▂▄▃▂▁▂█▂▂▂▂▂▃▃▃▃▃0.0211.765-0.769-12.8435.1441.827.984-0.1784.984-1.799-2.416-21.1431.057-4.91592.2633.96327.074-1.62469.97849.397-16.65214.06814.57713.49118.87717.6767.361-0.46146.658-1.4541.26820.0686.985-11.6210.83124.8425.4175.74110.0472.7989.2713.02519.86519.51219.026.454
us-gaap:IncomeTaxesPaid ▁▁▂▁▂▁▂▂▂▁▂▂▁▂▅▃▂▁▇▂▅▃▆▂▄▂▄█▂▂▃▁0.4654.3288.0224.42311.562.2287.7466.7136.5743.1969.44513.662.7468.05337.6215.06311.122.9950.0096.34137.86214.42341.9477.06924.0512.71428.88563.16812.43310.3921.630.247NANANANANANANANANANANANANANA
us-gaap:InterestExpense ██████████▁██▇▇▇▇▇▇▇▇████▇6.6666.999.91810.3659.97110.54510.6510.929.9079.478-63.1989.0398.964.5654.5374.484.4414.3864.0564.3044.2778.4898.4638.3328.1515.474NA4.0194.0193.943NA3.8693.8693.798NA3.7293.7283.663NANANANANANANANA
us-gaap:InterestExpenseDebt NANANA5.625.5466.486NA6.8285.512NANA4.6564.626NANANANANANANANANANANANANANANANANANANANANANANANANANANA1.438NANANANANA
 us-gaap:InterestExpenseDebt us-gaap:BusinessAcquisition idcc:TechnicolorPatentAcquisition████▄▄▄▄▁▁0.80.80.80.80.70.70.70.70.60.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestExpenseDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType idcc:ConvertibleNotes2020,us-gaap:ConvertibleDebtNANA0.00.00.00.9761.4641.4643.7134.7474.7154.6564.626NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InterestExpenseDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType idcc:ConvertibleNotes2024,us-gaap:ConvertibleDebt▂▂█████▇▁2.4022.3985.6575.625.5465.515.4135.3641.799NANA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InterestPaidNet NANA4.00.04.00.7123.9560.7120.8482.370.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▁▂▁▂▂▁▂▁▂▁▁▂▂▂▃▂▃▂▅▄▂▂▂▂▂▂▂▂▄▁▂▂▂▁▂█▂▂▂▂▂▂▂▂▂▃1.6185.571-1.3523.78422.2510.11613.7542.2347.743-2.8031.8321.40710.70629.92552.50235.53652.49933.756136.47104.46639.99428.07133.03824.5232.60229.06513.7913.51278.901-1.86114.53626.669.238-12.26915.532235.6699.67310.9322.76726.20617.15623.33934.31135.51534.96348.827
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▁▇▇▆▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇█▇▇▇▇█▇▇████-8.415-1.613-1.541-1.882-1.66-1.777-1.802-1.399-1.365-1.411-0.97-1.297-0.93-1.196-0.835-0.811-0.955-0.978-0.693-0.943-0.965-0.92-0.719-0.732-0.647-0.733-0.562-0.877-0.789-0.694-0.666-0.55-0.632-0.6340.00.00.00.0NANANANANANANANA
 us-gaap:NetIncomeLossAttributableToNoncontrollingInterest dei:LegalEntity idcc:Chordant▁▆▇█▇▇▇██▇-2.2-0.10.20.40.20.30.30.50.40.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLossAttributableToNoncontrollingInterest dei:LegalEntity idcc:Convida▁▅█████▇██-6.2-1.51.31.51.51.51.50.91.01.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLossAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterest▁█-8.415-1.613NA-1.882-1.66-1.777NA-1.399-1.365-1.411NA-1.642-1.19-1.501NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingIncomeLoss ▁▂▁▂▂▁▂▁▁▁▁▂▂▂▄▂▃▂▅▄▂▂▂▂▂▂▂▂▄▁▂▂▂▁▂█▂▂▂▂▂▂▂▂▂▃-3.14911.9893.1415.4331.9174.68125.2963.7748.915-0.153.84512.9215.6830.15145.70440.87580.94833.968209.149156.71823.08348.35653.3445.38758.57851.24425.28815.341128.372-0.04137.9849.12812.692-15.04418.832363.21917.57419.40535.49132.15329.80737.30653.64754.47153.07474.681
us-gaap:OtherIncome █▆█████▄▆▆▆▁▆2.5930.1712.5013.1692.4473.1463.005-4.3960.0750.463-0.264-8.654-0.237NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss ▁▁▁▂▂▁▂▁▂▁▁▂▂▂▃▂▃▂▅▄▂▂▂▂▂▂▂▂▄▁▂▂▂▁▂█▂▂-6.7973.958-2.89121.90220.591-1.66111.9520.8356.378-4.2140.8620.119.77628.72955.24634.72551.54432.778139.298103.52339.02927.15135.1523.78831.95528.33216.1512.63578.112-2.55516.35226.118.606-12.90315.532235.6699.67310.93NANANANANANANANA
us-gaap:ResearchAndDevelopmentExpense ▇██▆▇▅▅▆▄▅▆▄▃▃▅▃▄▅▅▃▂▆▆▃▅▄▄▅█▂▄▃▁▃▃▃▄▄▁▄▃▄▇▄▃▃21.8722.58322.89120.84522.09218.81818.83220.50617.02718.49520.41917.27615.82916.17418.4815.92417.78318.52118.29515.5614.60920.26919.76716.61818.32617.99117.76619.19122.90815.43517.93515.77213.47716.14616.82116.37517.17717.48913.56117.01515.76317.42421.47917.45716.36416.164
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▂▂▂▂▂▂▂▁▂▁▂▂▁▂▄▂▃▂▅▄▂▂▂▂▂▂▂▂▄▁▂▂▁▁▂█▁▁▂▂▁▂▂▂▂▂87.73582.36390.7987.493104.49876.21102.16172.52375.60968.63175.32675.07969.55587.444205.30497.325135.77994.53273.868208.30775.915107.764112.098100.408118.551110.37886.12177.622194.23457.84499.683110.62367.69247.36387.877434.0171.87169.30576.95676.45569.87378.45895.28291.92391.153116.187
us-gaap:Revenues ▂▂▂▂▂▂▂▁▂▁▂▂▁▂▄▂▃▂▅▄▂▂▂▂▂▂▂▂▄▁▂▂▁▁▂█▁▁▂▂▁▂▂▂▂▂87.73582.36390.7987.493104.49876.21102.16172.52375.60968.63175.32675.07969.55587.444205.30497.325135.77994.53273.868208.30775.915107.764112.098100.408118.551110.37886.12177.622194.23457.84499.683110.62367.69247.36387.877434.0171.87169.30576.95676.45569.87378.45895.28291.92391.153116.187
us-gaap:SellingGeneralAndAdministrativeExpense █▅▇▅▅▆▅▇▆█▆▆▅▇▇▅▅▆█▄▄▆▄▄▄▄▁▄▆▃▂▃▃▂▃▃▅▃▁▃▂▂▁▂▁▂14.79911.21713.74810.85411.79412.60311.28913.47112.31414.21512.46112.80611.55914.20413.52211.85311.56912.63414.4819.889.93811.9729.7910.0410.4359.5186.889.63612.0859.1527.5568.9378.3597.8428.3838.86510.929.1836.7729.3877.5477.786.5517.2237.0087.519
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets ▅▆▆▆▅▅▆▆▆▅▆▇▆▆▇█▇█▇▅▅▄▅▅▅▅▃▄▅▃▃▃▃▂▂▃▁▂▂▂▂▁▁1497.0831561.8741616.2751640.4941538.7651464.731612.0821628.3021545.0661479.7511626.5581788.0881619.651626.1581854.421936.1221838.8991865.3881727.8531442.851469.7111274.6611474.4851448.6921461.1221457.7731194.5911297.3941423.3291080.3591113.1831129.5851153.9031014.6871056.6091115.606860.265932.417996.9681022.0121040.022839.432874.643NANANA
us-gaap:Liabilities ▅▅▅▅▄▄▅▅▄▃▄▄▂▂▇█▇█▇▅▆▄▆▆▇▇▄▄▅▂▂▂▃▂▂▂▁▁▂▂▃▁▂780.838829.301819.709837.818748.059689.134825.801825.003744.826654.238688.545773.039583.426590.426981.2721104.1061033.2431105.247973.485827.578946.553769.493952.59957.082968.291973.436718.914767.152823.005551.097579.363582.261635.675509.039537.904548.652452.158479.145525.286573.422618.381462.728521.527NANANA
us-gaap:LiabilitiesAndStockholdersEquity ▅▆▆▆▅▅▆▆▆▅▆▇▆▆▇█▇█▇▅▅▄▅▅▅▅▃▄▅▃▃▃▃▂▂▃▁▂▂▂▂▁▁1497.0831561.8741616.2751640.4941538.7651464.731612.0821628.3021545.0661479.7511626.5581788.0881619.651626.1581854.421936.1221838.8991865.3881727.8531442.851469.7111274.6611474.4851448.6921461.1221457.7731194.5911297.3941423.3291080.3591113.1831129.5851153.9031014.6871056.6091115.606860.265932.417996.9681022.0121040.022839.432874.643NANANA
us-gaap:StockholdersEquity ▅▅▅▆▅▅▅▅▆▆▇███▆▆▆▅▅▄▃▂▃▂▂▂▂▃▄▃▃▃▃▃▃▃▂▂▂▂▂▁▁704.185712.098773.369783.271769.419752.649761.557782.106788.898812.806927.0251000.5911020.4691019.047855.267820.101792.93746.46739.709606.724513.667494.712510.519486.323484.311476.446468.328523.607594.087523.511528.65542.764514.393506.282518.705566.954408.107453.272471.682448.59421.641376.704353.116NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AssetsCurrent ▄▄▅▅▄▃▅▅▄▃▅▆▆▆██▇▇▆▄▄▃▄▅▅▅▃▄▅▃▃▃▄▂▃▃▁▂▂▂▃▁▁922.703984.881026.8791031.957921.012875.8451016.3321022.523940.998875.9461024.251190.9121200.5191208.3981395.7941420.3041336.0211342.2351221.119974.738966.481798.0961010.9671086.281117.1941117.116843.179959.9931117.091815.446857.514879.294903.878761.514814.347881.663622.526705.843768.887782.059793.451611.493619.556NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▄▄▅█▇▅██▆▅▅▅▅▄▄▃▁▁▄▂▆▅▅▅▅▇▄▄▄▄▅▆▅▄▃▅▁▂▃▄▄▂▂▃▂▂410.144396.156473.474746.561670.292515.793745.491735.886531.698503.24488.733508.829523.779417.481433.014283.557180.952139.073404.074187.162601.388524.307510.207477.643507.036687.2428.567368.799383.046391.453497.714555.543459.023368.688349.843520.892168.985268.628342.211409.653379.589200.117215.451313.62217.431214.368
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▁▁▃█▆▄██▄▃▂▃411.966400.925477.663752.043677.279529.725757.098746.195543.163516.612475.056524.771NA417.481433.014283.557NANA404.074NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ShortTermInvestments ▄▅▅▁▁▂▂▂▃▃▅▆▆▇█▇██▆▆▂▁▄▄▄▂▃▄▃▃▂425.759488.559453.173172.822168.953265.107179.204211.737299.461289.805470.724549.521576.782699.136724.981683.655704.435747.067548.687594.387212.51134.387423.501389.801400.559223.981275.361363.893289.856293.14200.737NA310.769267.12227.436260.435355.134347.374335.783280.938321.524327.324326.218NANANA
us-gaap:OtherAssetsCurrent █▁▁11.9223.292.916NANANA8.53NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA10.4929.119NANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▆▇▆▆▅▅▅▄▄▃▃█▁▁▁▄▄▄▃▃▃▁▁▂▂▂▂▃▃▂▃74.79787.66384.22484.29262.38769.33763.36551.54552.65649.57943.438102.79321.9724.99221.50652.96651.5953.56239.89446.30648.40224.79423.39133.88432.47336.70133.5347.76843.17738.56640.036NA31.41631.03930.1978.8598.6246.2398.82431.47810.85NA9.119NANANA
us-gaap:MachineryAndEquipmentGross NANA1.183NANANA1.333NANANA4.168NANANA4.034NANANA3.767NANANA12.321NANANA11.97NANANA11.631NANANA11.604NANANA11.021NANANA9.339NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical idcc:CanadaAndEuropeNANA23.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NoncurrentAssets us-gaap:StatementGeographical,us-gaap:PropertyPlantAndEquipmentByType country:US,idcc:PropertyPlantAndEquipmentAndPatentsNetNANA435.0NANANA446.6NANANA464.6NANANA336.1NANANA287.2NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AssetsNoncurrent ▇▇▇██▇██████▄▄▅▆▆▆▆▅▆▅▅▃▃▃▃▃▂▂▂▁▁▁▁▁▁▁▁▁▁▁▂574.38576.994589.396608.537617.753588.885595.75605.779604.068603.805602.308597.176419.131417.76458.626515.818502.878523.153506.734468.112503.23476.565463.518362.412343.928340.657351.412337.401306.238264.913255.669250.291250.025253.173242.262233.943237.739226.574228.081239.953246.571227.939255.087NANANA
us-gaap:PropertyPlantAndEquipmentGross NANA32.861NANANA28.791NANANA41.668NANANA38.651NANANA36.762NANANA63.495NANANA60.117NANANA53.239NANANA54.475NANANA51.104NANANA47.265NANANA
us-gaap:FurnitureAndFixturesGross NANA1.051NANANA1.121NANANA1.549NANANA1.279NANANA1.247NANANA1.513NANANA1.292NANANA1.166NANANA1.578NANANA1.357NANANA1.202NANANA
us-gaap:LeaseholdImprovementsGross NANA11.076NANANA11.315NANANA11.364NANANA9.711NANANA9.692NANANA7.544NANANA7.406NANANA6.477NANANA4.655NANANA4.53NANANA4.287NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NANA16.231NANANA18.574NANANA31.617NANANA27.978NANANA24.136NANANA51.347NANANA47.571NANANA43.704NANANA46.651NANANA43.107NANANA38.921NANANA
us-gaap:PropertyPlantAndEquipmentNet ▆▇██▄▂▂▂▃▂▂▂▂▂▂▃▃▄▄▃▃▄▄▃▃▃▄▁▁▁▁14.58815.62616.6316.24411.91810.24310.21710.01810.73610.58110.05110.27810.57510.18510.67311.09711.31912.03312.62611.28211.58312.80212.14811.07211.47910.83612.5469.3149.3699.0989.535NA7.1957.3187.8247.0796.9527.2297.9977.457.6097.8928.344NANANA
us-gaap:LongTermInvestments NANA15.5NANANA14.2NANANA17.4NANANA19.2NANANA14.6NANANA12.6NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Goodwill 22.421NA22.4NANANA22.4NANANA22.42122.421NANA16.0NANANA16.2NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset 19.091NA23.273NANANA24.51316.58717.5312.898NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent █▆▆▇▇▇▇▅▆▆▅▆▅▄▄▄▃▃▃▂▂▂▂▁▁▁▁▁▁▁▁95.40271.4274.04376.08378.74479.14676.02661.36771.39866.74260.46563.87750.21947.66437.96337.07433.90834.06933.80815.29915.22413.31213.2197.430.8050.9561.5432.0642.1672.2993.137NA19.08719.5926.19426.55426.9727.5528.01128.27647.90443.28244.684NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:ContractWithCustomerLiabilityCurrent ▃▅▆█▂▁▂▄158.899192.422219.935248.086141.528126.298146.654171.433NANA111.672NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesCurrent ▄▄▅▅▃▃▅▆▄█▃▅▁▁▇█▇▇█▄▆▂▇▇▇▇▃▃▄▁▁▁▂▂▂▅▂▂▂▂▂▂▂234.221253.234295.762317.412203.93185.833305.558334.299242.898448.153179.395293.552128.297126.19376.441440.439379.678414.665425.48238.243371.375171.225399.973406.582398.353385.664205.169217.689245.423105.846126.438126.547166.047164.338172.913279.666165.427141.558173.153167.626164.78160.236178.56NANANA
us-gaap:OperatingLeaseLiabilityCurrent NANA3.17NANANA3.4373.6243.9633.382NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent █▁▂27.17519.92721.289NANANA11.382NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA7.424.762NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:LongTermDebt us-gaap:AdjustmentsForNewAccountingPronouncements,us-gaap:LongtermDebtType idcc:AccountingStandardsUpdate202006,us-gaap:ConvertibleDebtNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:AdjustmentsForNewAccountingPronouncements,us-gaap:LongtermDebtType us-gaap:AccountingStandardsUpdate202006,us-gaap:ConvertibleDebtNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:AdjustmentsForNewAccountingPronouncements,us-gaap:LongtermDebtType,us-gaap:SubsequentEventType idcc:AccountingStandardsUpdate202006,us-gaap:ConvertibleDebt,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtNoncurrent ██▇▇▇▇▇▇▇▁▆▆▆▆▆▆▆▅▅▅▅▅▅▅▅▅▄▄▄▄▄420.598419.396367.992363.523359.119354.823350.588346.397342.41719.061317.377313.527291.947288.506285.126281.774278.479275.222272.021268.847265.728262.635259.595256.56253.593250.674217.835215.502213.247210.992208.813NA204.53202.425200.391198.357196.392194.4192.529NANA0.1040.18NANANA
us-gaap:MinorityInterest ▁▆▇▅▆▇█▆12.0620.47523.19719.40521.28722.94724.72421.193NANA1.284NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▇▇███▇█▆▆█▆▅▂▂▂▂▃▃▃▃▃▂▂▂▂▂▁▁▁▁▁43.57344.51847.88648.29645.61443.98146.00236.80938.03448.45734.13930.4959.8869.76410.0348.84416.71716.414.97110.97510.7754.4713.9833.843.7533.962.5681.6920.9880.9040.248NA0.00.02.783.3772.9222.4795.6519.3914.22812.60510.613NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent NANA23.043NANANA24.14215.86716.9212.915NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA5.463NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA4.727NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA4.508NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA3.585NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA8.795NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity ▅▅▅▆▅▅▅▅▆▆▇███▆▆▆▅▅▄▃▂▃▂▂▂▂▃▄▃▃▃▃▃▃▃▂▂▂▂▂▁▁704.185712.098773.369783.271769.419752.649761.557782.106788.898812.806927.0251000.5911020.4691019.047855.267820.101792.93746.46739.709606.724513.667494.712510.519486.323484.311476.446468.328523.607594.087523.511528.65542.764514.393506.282518.705566.954408.107453.272471.682448.59421.641376.704353.116NANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest ▄▄▅▅▅▅▅▅▅▅▇███▆▅▅▅▄▃▂▁▂▁▁▁▁▂▃▂▂▂▂▁▂716.245732.573796.566802.676790.706775.596786.281803.299800.24825.513938.0131015.0491036.2241035.732873.148832.016805.656760.141754.368615.272523.158505.168521.895491.61492.831484.337475.677530.242600.324529.262533.82547.324518.228505.648518.705NANANANANANANANANANANA
us-gaap:CommonStockValue █▆▆▃▃▃▁▁0.7150.7140.7140.7130.7130.7130.7120.712NANA0.711NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA0.6890.686NANANA
us-gaap:AdditionalPaidInCapital ████▇▇▇▇▇▅▅▅▅▅▅▅▄▄▅▅▄▄▄▄▄▄▂▂▁▁▁745.472738.619738.481735.922734.565729.541727.402725.891724.17683.615685.512683.14678.434672.692680.04675.872671.783667.152683.549675.825670.893666.426663.073657.322653.892651.344614.162611.251607.231599.493598.325NA586.7583.755579.852577.24575.681573.708573.95568.985563.128NA525.767NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▁▂▆▇▆▅▆▆▇▇█1349.0731358.381413.9691426.2391413.3821402.0481412.7791409.871418.6281421.8841435.97NA1435.9941437.283-1249.091NANANANANANANANANANANANANANANANANANANANANANANANANANA414.506395.799NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▇▇▇▇█▇▇▇▇▅▄▂▂▁▄▆▇▇▇▇██▇▇███▇█▇▇-0.323-0.254-0.1840.0080.37-0.042-0.074-0.105-0.35-1.426-2.471-3.436-3.903-4.279-2.083-0.695-0.601-0.559-0.5140.0240.210.074-0.178-0.0060.1260.1130.118-0.1680.368-0.402-0.014NA1.1121.0190.8641.0070.2980.298-0.439-0.4290.0440.1230.111NANANA
us-gaap:TreasuryStockValue █████████▇▆▅▅▅▅▄▄▄▄▄▄▄▄▄▃▃▃▂▁▁▁1390.7521385.3611379.6111379.6111379.6111379.6111379.2621354.2621354.2621291.9791182.9931115.9951081.661078.5121072.4881064.7951064.7951064.7951064.7951064.7951059.1051040.5091000.11992.752974.272954.431903.7839.097759.53751.075751.075NA721.941721.941721.941721.941646.992594.572569.247569.247569.247569.247569.247NANANA
us-gaap:MinorityInterest ▁▆▇▅▆▇█▆12.0620.47523.19719.40521.28722.94724.72421.193NANA1.284NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue █▁3.7752.153NA1.2674.6292.003NA1.805-2.116-2.096NA2.239-1.8210.816NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders NA1.109NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterestNA1.109NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂▃▃▄▄▂▃▅▃▂▂▅▃▃▆▄▃▂▆▃▆▃▄▃▃▃▄▅▃▃▃▃▅▄▁█▃▂▃▃▂▃▂▄▃▄-27.259-9.84219.255101.34269.755-26.88517.457125.499-22.742-30.781-29.825170.3856.827-0.595217.459104.74919.447-25.855233.282-10.171191.43416.23386.7770.65625.2951.77155.984155.74833.14-2.859-0.545-1.03143.51276.238-122.814341.752-15.625-25.705-1.778-1.303-26.05-5.207-29.22181.5968.84672.702
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▅▂▅▆▄▅▆▅▇▆▄▆▅▅▅▅▃▅▁▄█▅▅▃▅▆▄▅▄▅▆▅▅▅▆▅▅▄▅▅▅▄▅▅▄51.509-47.026-288.07-15.74288.302-94.53624.06289.681-18.524173.03772.747-125.245110.96411.518-54.78.31533.069-206.981-13.696-391.581-89.062275.334-46.918-4.355-184.81222.1175.905-83.708-30.399-102.107-25.655100.22-55.138-57.74220.66489.413-27.497-19.614-63.91632.859-1.364-8.731-85.16211.591-7.933-76.42
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▅▅▅▅▃▄▅▆▃▄▄▅▄▅▅▅▄▅▅▄▁▅▄▅█▄▄▅▅▄▅▅▅▄▄▄▄▅▅█▅▅▅▅▅-13.209-19.87-5.565-10.836-10.503-105.952-30.616-12.14867.817-114.377-78.96-44.148-11.493-26.456-13.302-10.459-10.637-32.165-2.674-12.474-25.291-277.467-7.295-25.694-20.647234.752-72.121-86.287-11.148-1.295-31.629-2.671.9610.349-68.899-79.258-56.521-28.264-1.748-1.492206.886-1.39616.2143.0022.157.223
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▅▄▁▆▇▂▅█▅▅▄11.041-76.738-274.3874.764147.554-227.37310.903203.03226.55127.879-36.038NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AmortizationOfFinancingCosts NANANA0.2970.2910.3580.4090.380.364NA0.3480.3470.3470.3470.3470.3480.3470.3470.3480.3470.3470.6730.6950.6750.6750.4420.3260.3260.3260.3260.3250.3260.3260.3260.3250.3260.3260.3260.3250.3260.3260.00.00.0NANA
 us-gaap:AmortizationOfFinancingCosts us-gaap:DebtInstrument,us-gaap:LongtermDebtType idcc:ConvertibleNotes2020,us-gaap:ConvertibleDebtNANA0.00.00.00.070.1040.1040.2660.3470.3480.3470.3470.3470.3470.3480.3470.347NA0.3470.3470.347NA0.3490.3490.116NA0.00.00.0NANANANANANANANANANANANANANANANA
 us-gaap:AmortizationOfFinancingCosts us-gaap:DebtInstrument,us-gaap:LongtermDebtType idcc:ConvertibleNotes2024,us-gaap:ConvertibleDebt██▆▆▅▅▅▅▁0.4020.3980.30.2970.2910.2880.280.2760.098NANA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DeferredIncomeTaxExpenseBenefit NANA-1.3561.402-6.169-0.75110.384-2.3-2.913-2.801-22.022-18.306-3.816-5.55178.282-1.68615.277-21.44424.06239.22-29.709-11.291-24.6885.984-7.988-6.559-30.0-25.244-7.306-7.593-5.80919.8664.972-10.59441.428-9.5693.3363.977-8.7449.133-12.59810.77519.432-18.810.09-7.45
us-gaap:DepreciationDepletionAndAmortization ▇▇▇██▇█▇▇▇▇▆▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁19.68919.86120.01420.6621.20719.1620.18719.26519.12818.51419.08417.68614.63914.69914.24414.55413.72714.52813.60313.20813.06612.87612.47911.89111.78311.6411.52412.359.0219.3519.3227.8518.2337.9797.0356.6276.2996.2876.0795.9755.9095.8425.675.6525.3215.482
us-gaap:IncreaseDecreaseInAccountsPayable ▄▄▄▅▄▄▅▅▂▆▅▆▄▅▄▄▃▅▅▃▅▄▅▅▅▃▅▄▅▁█▄▆▄▃▆▅▄▅▄▄▄▄▅▄▅-0.084-0.291-1.1751.9-1.098-2.4771.9090.558-9.2746.1690.5638.498-3.9411.083-0.5910.039-5.7532.5161.64-6.4440.472-1.2322.4941.4622.926-4.3793.62-1.5732.176-14.61915.182-2.4425.452-3.537-5.8857.4322.385-1.4791.696-0.163-1.154-0.95-1.8170.531-0.7642.467
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂▃▃▄▄▂▃▅▃▂▂▅▃▃▆▄▃▂▆▃▆▃▄▃▃▃▄▅▃▃▃▃▅▄▁█▃▂▃▃▂▃▂▄▃▄-27.259-9.84219.255101.34269.755-26.88517.457125.499-22.742-30.781-29.825170.3856.827-0.595217.459104.74919.447-25.855233.282-10.171191.43416.23386.7770.65625.2951.77155.984155.74833.14-2.859-0.545-1.03143.51276.238-122.814341.752-15.625-25.705-1.778-1.303-26.05-5.207-29.22181.5968.84672.702
us-gaap:NetIncomeLoss ▁▂▁▂▂▁▂▁▂▁▁▂▂▂▃▂▃▂▅▄▂▂▂▂▂▂▂▂▄▁▂▂▂▁▂█▂▂▂▂▂▂▂▂▂▃1.6185.571-1.3523.78422.2510.11613.7542.2347.743-2.8031.8321.40710.70629.92552.50235.53652.49933.756136.47104.46639.99428.07133.03824.5232.60229.06513.7913.51278.901-1.86114.53626.669.238-12.26915.532235.6699.67310.9322.76726.20617.15623.33934.31135.51534.96348.827
us-gaap:ProfitLoss ▁▁▁▂▂▁▂▁▂▁▁▂▂▂▃▂▃▂▅▄▂▂▂▂▂▂▂▂▄▁▂▂▂▁▂█▂▂-6.7973.958-2.89121.90220.591-1.66111.9520.8356.378-4.2140.8620.119.77628.72955.24634.72551.54432.778139.298103.52339.02927.15135.1523.78831.95528.33216.1512.63578.112-2.55516.35226.118.606-12.90315.532235.6699.67310.93NANANANANANANANA
us-gaap:ShareBasedCompensation ▄▄▄▃▅▄▄▄▄▄▄▄▄▃▅▄▅▅▅▅▄▅▅▄▄▄▅▄▆▄█▁▄▅▄▄▄▄▄▄▄▄▄▃▃▄3.7752.1532.5431.2684.6282.0031.5861.8052.1162.0962.2142.2381.8210.8164.1613.9234.6615.3176.5394.7213.9376.6435.4483.3923.3212.9785.0363.7377.6122.10913.332-5.1832.2735.5181.8581.5021.5631.5722.0792.6691.6911.6761.8671.31.1921.442
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▅▂▅▆▄▅▆▅▇▆▄▆▅▅▅▅▃▅▁▄█▅▅▃▅▆▄▅▄▅▆▅▅▅▆▅▅▄▅▅▅▄▅▅▄51.509-47.026-288.07-15.74288.302-94.53624.06289.681-18.524173.03772.747-125.245110.96411.518-54.78.31533.069-206.981-13.696-391.581-89.062275.334-46.918-4.355-184.81222.1175.905-83.708-30.399-102.107-25.655100.22-55.138-57.74220.66489.413-27.497-19.614-63.91632.859-1.364-8.731-85.16211.591-7.933-76.42
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▂▁▃█▃▃▃▁▂▃▂▁▂▁▂▁▂▁▄▂▂▃▃▁▁▂▅▃▁▂▃▃▂▁▃▂▁▁▂▂▂▂▂▂▂▁0.550.3871.9186.1042.1681.6031.4470.21.2781.5840.6940.341.1430.3991.1290.1170.5570.2682.4051.2110.6721.5941.8650.5060.4910.8383.8991.730.2461.221.8591.5520.7510.4291.6420.9490.4990.5311.3120.6970.8950.9310.7820.650.6460.442
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▅▅▅▅▃▄▅▆▃▄▄▅▄▅▅▅▄▅▅▄▁▅▄▅█▄▄▅▅▄▅▅▅▄▄▄▄▅▅█▅▅▅▅▅-13.209-19.87-5.565-10.836-10.503-105.952-30.616-12.14867.817-114.377-78.96-44.148-11.493-26.456-13.302-10.459-10.637-32.165-2.674-12.474-25.291-277.467-7.295-25.694-20.647234.752-72.121-86.287-11.148-1.295-31.629-2.671.9610.349-68.899-79.258-56.521-28.264-1.748-1.492206.886-1.39616.2143.0022.157.223
us-gaap:RepaymentsOfLongTermDebt NANA0.00.00.094.9090.00.0221.10.00.00.0NANA0.00.00.00.00.00.00.0230.00.00.00.00.0NANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsOfDividends ▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁█▁▁▁▁▁▁▁▁▁10.73910.78610.78210.78110.76210.74710.89710.89411.1611.62911.99612.15312.16412.15512.14810.41310.40210.29210.2866.8586.9237.0687.0937.1797.2327.4337.6098.0324.0454.0434.1214.1184.1150.069.6894.3484.474.574.5484.544.5364.5260.00.0NANA
us-gaap:Dividends █▁10.76710.766NA10.78210.78110.763NA10.89710.89511.18-84.23411.99712.15312.164-78.08812.14910.41310.404-58.4310.2856.8616.923-50.2067.1837.2437.2327.57.3178.2914.0454.0334.11912.348-4.115NANANANANANANANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock ▁▁▁▁▁▁▃▁▅█▅▃▁▁▁▁▁▁▁▁▂▄▁▂▂▄▅▆▂▁▃▁▁▁▁▆▄▃▁▁▁▁5.3915.750.00.00.00.34925.00.062.283108.98666.99734.3363.1486.0247.6930.00.00.00.05.6918.59640.3997.35818.4819.84150.73164.60379.5688.4540.029.1340.00.00.00.074.94952.4225.3250.00.00.00.0NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312011-03-312010-12-312009-12-31
Value715000.0714000.0714000.0713000.0713000.0713000.0712000.0712000.0711000.0689000.0686000.0668000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.10.10.1

Shares Outstanding

us-gaap:SharesOutstanding us-gaap:StatementEquityComponents

us-gaap:SharesOutstanding

us-gaap:CommonStock


Shares
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value71717171717171717171707070
Percentage of SharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStock


Shares
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value404040-40.5674040393736363636-36.02
Percentage of SharesOutstanding56.856.856.9-56.956.356.355.052.951.651.051.051.1-51.2

Shares Issued

us-gaap:SharesIssued us-gaap:StatementEquityComponents

us-gaap:SharesIssued

us-gaap:CommonStock


Shares
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312018-12-312017-12-312010-12-312009-12-312008-12-312007-12-31
Value717171717171717068666565
Percentage of SharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStock


Shares
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312018-12-312017-12-312010-12-312009-12-312008-12-312007-12-31
Value404040404040373623232218
Percentage of SharesIssued56.956.956.856.856.956.952.951.134.435.334.228.8

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-06-302009-12-31
Value717171717171717171717171717070707070707070707070707069696969696969696969696868686866
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-06-302009-12-31
Value303030303030303131323334343434343434343434343535353636404041404140434545454545454543
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value3131313130313132353535353536343435363637404040414141424445464545444444
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value3030303030313132343434343434343435353636394040414141424345454545444343
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302011-06-302011-03-312010-06-30
Value4.9515.04110111212109.2824.4830.00.00.1
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

idcc:RestrictedStockUnitsRSUsAndShareBasedPaymentArrangementOption


Antidilutive
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.030.120.2180.26
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount0.62.41.92.0

us-gaap:ConvertibleDebtSecurities


Antidilutive
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302012-03-312011-09-30
Value4.9214.9216.2686.264.9864.440.00.00.00.00.00.04.3664.3667.7248.4964.3665.14.04.04.134.04.04.03.7
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount47.343.149.049.449.247.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RestrictedStockUnitsRSU


Antidilutive
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value0.1560.2180.260.1550.1530.4020.078
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount1.51.92.01.21.54.31.7

us-gaap:Warrant


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-30
Value4.9214.9215.3196.2736.2686.264.9864.444.4054.4054.4034.3864.3680.04.3668.4558.4968.4968.4965.14.04.04.134.04.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount99.497.651.255.049.049.449.247.898.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.050.18-0.040.770.7200.440.070.25-0.090.050.620.310.861.521.021.510.983.983.051.160.80.930.680.910.790.370.341.95-0.050.350.650.22-0.30.385.610.220.240.50.580.380.520.770.810.81.12
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EarningsPerShareBasic us-gaap:AdjustmentsForNewAccountingPronouncements

idcc:AccountingStandardsUpdate202006


Earnings
Period End2021-03-31
Value0.09
Percentage of EarningsPerShareBasic50.0

us-gaap:AccountingStandardsUpdate202006


Earnings
Period End2021-06-30
Value0.09
Percentage of EarningsPerShareBasic180.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.050.18-0.040.760.7200.440.070.24-0.090.050.60.30.841.481.01.460.933.852.991.140.790.920.680.890.780.360.341.93-0.050.350.640.22-0.30.385.560.220.240.490.570.370.510.760.790.781.1
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1.5495.501-1.54223220.148132.4798.819-1.758-1.59821112847355233132104402830243229111279-2.24911259.331-12.114152369.6731122251723343535
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.86.7-1.726.821.70.213.53.411.7-2.6-2.129.115.932.223.236.438.635.748.350.152.926.326.824.327.526.313.016.741.0-3.911.923.213.8-25.617.554.513.516.829.633.724.429.835.838.638.4

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-8415000.0-1613000.0-1541000.0-1882000.0-1660000.0-1777000.0-1802000.0-1399000.0-1365000.0-1411000.0-1223000.0-1642000.0
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-9.6-2.0-1.7-2.2-1.6-2.3-1.8-1.9-1.8-2.1-1.6-2.2

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-6.8663.888-3.0832121-1.629111.087.454-3.1696.21820102653345132138103392734233128161278-2.94316258.699-12.748152369.67311
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-7.84.7-3.424.620.1-2.111.71.59.9-4.68.327.414.630.926.235.637.934.650.749.651.625.431.223.627.025.719.115.640.6-5.116.222.712.9-26.917.554.513.516.8

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value907087727271766866687162535759565460645152595855595960626557616155626970544941444041413738
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax103.685.496.582.469.593.975.294.888.2100.294.982.877.565.529.058.040.464.123.624.869.655.152.454.850.653.670.680.233.9100.161.955.681.3131.878.616.375.572.053.957.957.352.543.740.741.8

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-6.7765.723-3.669.059250.159190.65711-6.013-1.556-1.03310231433878312051522241463750462012124-4.005244615-24.5241636015163229263654555375
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-7.76.9-4.010.424.60.219.50.915.0-8.8-2.1-1.415.627.270.139.857.933.075.173.429.538.241.837.142.941.723.915.764.2-6.924.441.723.0-51.818.683.121.024.142.637.937.846.356.959.959.264.8

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.0211.765-0.769-12.8435.1441.827.984-0.1784.984-1.799-2.416-21.1431.057-4.915923.96327-1.6246949-16.65214141318177.361-0.46146-1.4541206.985-11.6210.831245.4175.741102.7989.271319191926
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.02.1-0.8-14.74.92.47.8-0.26.6-2.6-3.2-28.21.5-5.644.94.119.9-1.725.623.7-21.913.113.013.415.916.08.5-0.624.0-2.541.418.110.3-24.50.928.87.58.313.13.713.316.620.821.220.822.8

Income Taxes Paid

us-gaap:IncomeTaxesPaid

us-gaap:IncomeTaxesPaid


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.4654.3288.0224.423112.2287.7466.7136.5743.1969.445132.7468.0533715112.99506.3413714417.069241228631210210.247
Percentage of IncomeTaxesPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.55.38.85.111.12.97.69.38.74.712.518.23.99.218.315.58.23.218.33.049.913.437.47.020.311.533.581.46.418.021.70.2

us-gaap:IncomeTaxesPaid us-gaap:IncomeTaxAuthority

us-gaap:ForeignCountry


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value0.43.68.14.4112.07.36.42.03.18.67.01.77.8356.81.93.0296.32914247.1111218374.99.2200.20.81.82.20.10.40.90.70.01.83.0
Percentage of IncomeTaxesPaid86.083.2101.099.598.689.894.295.330.497.091.151.261.996.993.045.117.1100.359.899.477.799.157.7100.448.696.765.159.839.488.594.881.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.54.48.95.010.92.67.18.82.64.511.49.32.48.917.07.01.43.210.93.038.713.321.67.19.911.121.848.72.515.920.60.21.23.82.50.00.61.30.90.02.63.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ForeignCountry0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value6.6666.999.918109.9711010109.9079.478-63.1989.0398.964.5654.5374.484.4414.3864.0564.3044.2778.4898.4638.3328.1515.4744.0194.0193.9433.8693.8693.7983.7293.7283.663
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.68.510.911.89.513.810.415.113.113.8-83.912.012.95.22.24.63.34.61.52.15.67.97.58.36.95.05.22.16.83.55.78.00.95.25.3

Interest Expense Debt

us-gaap:InterestExpenseDebt

us-gaap:InterestExpenseDebt


Interest
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302018-09-302018-06-302011-06-30
Value5.625.5466.4866.8285.5124.6564.6261.438
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.45.38.59.47.36.26.72.1

us-gaap:InterestExpenseDebt us-gaap:BusinessAcquisition

idcc:TechnicolorPatentAcquisition


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.80.80.80.80.70.70.70.70.60.6
Percentage of InterestExpenseDebt0.00.00.014.212.610.80.010.310.90.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.91.00.90.90.70.90.71.00.80.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:TechnicolorPatentAcquisition0.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpenseDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

idcc:ConvertibleNotes2020, us-gaap:ConvertibleDebt


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.00.00.00.9761.4641.4643.7134.7474.7154.6564.626
Percentage of InterestExpenseDebt0.00.00.015.00.021.467.40.00.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.01.31.42.04.96.96.36.26.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:ConvertibleNotes2020 us-gaap:ConvertibleDebt0.00.00.00.00.00.00.00.00.00.00.0

idcc:ConvertibleNotes2024, us-gaap:ConvertibleDebt


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-09-30
Value2.4022.3985.6575.625.5465.515.4135.3641.7990.0
Percentage of InterestExpenseDebt0.00.00.0100.0100.085.00.078.632.60.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.72.96.26.45.37.25.37.42.40.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:ConvertibleNotes2024 us-gaap:ConvertibleDebt0.00.00.00.00.00.00.00.00.00.0

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value4000000.004000000.0712000.03956000.0712000.0848000.02370000.00
Percentage of InterestPaidNet100.00.0100.0100.0100.0100.0100.0100.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.40.03.80.93.91.01.13.50.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.6185.571-1.3523220.116132.2347.743-2.8031.8321102952355233136104392833243229131378-1.86114269.238-12.269152359.673102226172334353448
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.86.8-1.527.221.30.213.53.110.2-4.12.428.515.434.225.636.538.735.749.850.252.726.029.524.427.526.316.017.440.6-3.214.624.113.6-25.917.754.313.515.829.634.324.629.736.038.638.442.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1.6185.57123220.1162.2347.743-2.803211030
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0101.6102.4101.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.86.827.221.30.23.110.2-4.129.015.834.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-8415000.0-1613000.0-1541000.0-1882000.0-1660000.0-1777000.0-1802000.0-1399000.0-1365000.0-1411000.0-970000.0-1297000.0-930000.0-1196000.0-835000.0-811000.0-955000.0-978000.0-693000.0-943000.0-965000.0-920000.0-719000.0-732000.0-647000.0-733000.0-562000.0-877000.0-789000.0-694000.0-666000.0-550000.0-632000.0-634000.00000
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-9.6-2.0-1.7-2.2-1.6-2.3-1.8-1.9-1.8-2.1-1.3-1.7-1.3-1.4-0.4-0.8-0.7-1.0-0.3-0.5-1.3-0.9-0.6-0.7-0.5-0.7-0.7-1.1-0.4-1.2-0.7-0.5-0.9-1.30.00.00.00.0

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest dei:LegalEntity

idcc:Chordant


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-2200000.0-100000.0200000.0400000.0200000.0300000.0300000.0500000.0400000.0300000.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest26.16.2-13.0-21.3-12.0-16.9-16.6-35.7-29.3-21.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.5-0.10.20.50.20.40.30.70.50.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:Chordant0.00.00.00.00.00.00.00.00.00.0

idcc:Convida


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-6200000.0-1500000.01300000.01500000.01500000.01500000.01500000.0900000.01000000.01100000.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest73.793.0-84.4-79.7-90.4-84.4-83.2-64.3-73.3-78.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-7.1-1.81.41.71.42.01.51.21.31.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:Convida0.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-8415000.0-1613000.0-1882000.0-1660000.0-1777000.0-1399000.0-1365000.0-1411000.0-1642000.0-1190000.0-1501000.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0126.6128.0125.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-9.6-2.0-2.2-1.6-2.3-1.9-1.8-2.1-2.2-1.7-1.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-3.149113.1415314.681253.7748.915-0.153.8451215301454080332091562348534558512515128-0.041374912-15.0441836317193532293753545374
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.614.63.517.630.56.124.85.211.8-0.25.117.222.534.571.042.059.635.976.475.230.444.947.645.249.446.429.419.866.1-0.138.144.418.7-31.821.483.724.528.046.142.142.747.556.359.358.264.3

Other Income

us-gaap:OtherIncome

us-gaap:OtherIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2.5930.1712.5013.1692.4473.1463.005-4.3960.0750.463-0.264-8.654-0.237
Percentage of OtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.00.22.83.62.34.12.9-6.10.10.7-0.4-11.5-0.3

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-6.7973.958-2.8912120-1.661110.8356.378-4.2140.86209.7762855345132139103392735233128161278-2.55516268.606-12.903152359.67310
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-7.74.8-3.225.019.7-2.211.71.28.4-6.11.126.814.132.926.935.738.034.750.949.751.425.231.423.727.025.718.816.340.2-4.416.423.612.7-27.217.754.313.515.8

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense

us-gaap:ResearchAndDevelopmentExpense


Research
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value21222220221818201718201715161815171818151420191618171719221517151316161617171317151721171616
Percentage of ResearchAndDevelopmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.927.425.223.821.124.718.428.322.526.927.123.022.818.59.016.413.119.66.77.519.218.817.616.615.516.320.624.711.826.718.014.319.934.119.13.823.925.217.622.322.622.222.519.018.013.9

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value87829087104761027275687575698720597135942732087510711210011811086771945799110674787434716976766978959191116
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ContractWithCustomerBasisOfPricing

idcc:VariablePriceContract


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value7.3237.0964.5975.946
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.38.64.47.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.38.64.47.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:VariablePriceContract100.0100.0100.0100.0

us-gaap:FixedPriceContract


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value69697766
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax79.084.174.087.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax79.084.174.087.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:FixedPriceContract100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

idcc:CurrentPatentRoyalties


Revenue
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value848172746872727173
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax96.878.494.973.294.395.7105.194.598.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax96.878.494.973.294.395.7105.194.598.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:CurrentPatentRoyalties100.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:CurrentTechnologySolutions


Revenue
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value2.2713.3143.2122.7243.7242.0422.0282.5341.034
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.63.24.22.75.12.73.03.41.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.63.24.22.75.12.73.03.41.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:CurrentTechnologySolutions100.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:FixedFeeRoyaltyRevenue


Revenue
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value777766666363626160
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax88.474.087.165.587.984.391.681.280.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax88.474.087.165.587.984.391.681.280.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:FixedFeeRoyaltyRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:NonCurrentPatentRoyalties


Revenue
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.507190.70524-0.371.237-5.7750.840.128
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.618.40.924.2-0.51.6-8.41.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.618.40.924.2-0.51.6-8.41.10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:NonCurrentPatentRoyalties100.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:PatentLicensingRoyalties


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value8680878510172996873667274
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax98.397.396.197.496.895.897.393.897.396.795.698.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax98.397.396.197.496.895.897.393.897.396.795.698.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:PatentLicensingRoyalties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:TechnologySolutions


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value1.532.193.3143.212
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.72.73.24.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.72.73.24.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:TechnologySolutions100.0100.0100.0100.0

idcc:VariablePatentRoyaltyRevenue


Revenue
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value7.3774.5975.9467.8714.6838.5949.281013
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.44.47.87.76.511.413.513.418.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.44.47.87.76.511.413.513.418.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:VariablePatentRoyaltyRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:ContractWithCustomerDuration

idcc:PatentLicensingRoyalties, us-gaap:LongTermContractWithCustomer


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value9.5863.781190.705
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.94.618.40.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.94.618.40.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:PatentLicensingRoyalties us-gaap:LongTermContractWithCustomer100.0100.0100.0100.0

idcc:PatentLicensingRoyalties, us-gaap:ShortTermContractWithCustomer


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value76768172
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax87.392.878.494.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax87.392.878.494.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax idcc:PatentLicensingRoyalties us-gaap:ShortTermContractWithCustomer100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value87829087104761027275687575698720597135942732087510711210011811086771945799110674787434716976766978959191116
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense


Selling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value141113101112111312141212111413111112149.889.938119.7910109.5186.889.636129.1527.5568.9378.3597.8428.3838.865109.1836.7729.3877.5477.786.5517.2237.0087.519
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.913.615.112.411.316.511.118.616.320.716.517.116.616.26.612.28.513.45.34.713.111.18.710.08.88.68.012.46.215.87.68.112.316.69.52.015.213.38.812.310.89.96.97.97.76.5

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value14971561161616401538146416121628154514791626178816191626185419361838186517271442146912741474144814611457119412971423108011131129115310141056111586093299610221040839874908
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value41566258626560
Percentage of Assets2.83.63.83.54.14.53.8
Percentage of Assets2.83.63.83.54.14.53.8
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value780829819837748689825825744654688773583590981110410331105973827946769952957968973718767823551579582635509537548452479525573618462521738
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets52.253.150.751.148.647.051.250.748.244.242.343.236.036.352.957.056.259.356.357.464.460.464.666.166.366.860.259.157.851.052.051.555.150.250.949.252.651.452.756.159.555.159.681.3

us-gaap:Liabilities us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value5.76.15.85.85.33.95.4
Percentage of Liabilities0.70.70.70.70.70.60.7
Percentage of Assets0.40.40.40.40.30.30.3
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary13.810.89.410.08.56.08.9

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value14971561161616401538146416121628154514791626178816191626185419361838186517271442146912741474144814611457119412971423108011131129115310141056111586093299610221040839874908
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value70471277378376975276178278881292710001020101985582079274673960651349451048648447646852359452352854251450651856640845347144842137635316987137
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets47.045.647.847.750.051.447.248.051.154.957.056.063.062.746.142.443.140.042.842.135.038.834.633.633.132.739.240.441.748.547.548.044.649.949.150.847.448.647.343.940.544.940.418.70.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value922984102610319218751016102294087510241190120012081395142013361342122197496679810101086111711178439591117815857879903761814881622705768782793611619702
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets61.663.163.562.959.959.863.062.860.959.263.066.674.174.375.373.472.772.070.767.665.862.668.675.076.576.670.674.078.575.577.077.878.375.077.179.072.475.777.176.576.372.870.877.3

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value41039647374667051574573553150348850852341743328318013940418760152451047750768742836838339149755545936834952016826834240937920021531321721421010092
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets27.425.429.345.543.635.246.245.234.434.030.028.532.325.723.414.69.87.523.413.040.941.134.633.034.747.135.928.426.936.244.749.239.836.333.146.719.628.834.340.136.523.824.60.00.00.023.20.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:CashAndCashEquivalents

us-gaap:CommercialPaper


Cash
Period End2021-06-302020-12-31
Value0.080
Percentage of CashAndCashEquivalentsAtCarryingValue0.016.9
Percentage of Assets0.05.0
Percentage of Assets us-gaap:CommercialPaper0.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value16182418222318
Percentage of CashAndCashEquivalentsAtCarryingValue3.94.85.22.43.34.62.5
Percentage of Assets1.11.21.51.11.41.61.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary39.233.539.531.235.636.430.5

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-12-312017-09-302016-12-31
Value411400477752677529757746543516475524417433283404
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets27.525.729.645.844.036.247.045.835.234.929.229.325.723.414.623.4

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents us-gaap:FinancialInstrument

idcc:MoneyMarketFundsAndDemandDeposits


Cash
Period End2020-12-312019-12-312018-12-312017-12-31
Value397757488417
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents83.2100.0102.996.4
Percentage of Assets24.647.030.022.5
Percentage of Assets idcc:MoneyMarketFundsAndDemandDeposits0.00.00.00.0

us-gaap:CommercialPaper


Cash
Period End2021-03-312020-12-312019-12-312018-12-312017-12-31
Value14800.00.015
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents3.516.80.00.03.6
Percentage of Assets0.95.00.00.00.8
Percentage of Assets us-gaap:CommercialPaper0.00.00.00.00.0

Short Term Investments

us-gaap:ShortTermInvestments

us-gaap:ShortTermInvestments


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value425488453172168265179211299289470549576699724683704747548594212134423389400223275363289293200310267227260355347335280321327326198
Percentage of ShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets28.431.328.010.511.018.111.113.019.419.628.930.735.643.039.135.338.340.031.841.214.510.528.726.927.415.423.128.020.427.118.026.926.321.523.341.337.333.727.530.939.037.321.9

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312019-12-312011-03-312010-12-312009-12-31
Value113.292.9168.53109.11911
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.20.20.51.21.01.2

us-gaap:OtherAssetsCurrent us-gaap:Restatement

srt:ScenarioPreviouslyReported


Other
Period End2020-12-31
Value2.916
Percentage of OtherAssetsCurrent100.0
Percentage of Assets0.2
Percentage of Assets srt:ScenarioPreviouslyReported0.0

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7487848462696351524943102212421525153394648242333323633474338403131308.8598.6246.2398.82431109.119
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.05.65.25.14.14.73.93.23.43.42.75.71.41.51.22.72.82.92.33.23.31.91.62.32.22.52.83.73.03.63.62.73.12.90.81.00.70.93.11.01.0

us-gaap:PrepaidExpenseAndOtherAssetsCurrent us-gaap:Restatement

srt:ScenarioPreviouslyReported


Prepaid
Period End2020-12-31
Value84
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0
Percentage of Assets5.2
Percentage of Assets srt:ScenarioPreviouslyReported0.0

Machinery And Equipment Gross

us-gaap:MachineryAndEquipmentGross

us-gaap:MachineryAndEquipmentGross


Machinery
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1.1831.3334.1684.0343.76712111111119.339
Percentage of MachineryAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.30.20.20.81.01.01.11.11.1

Noncurrent Assets

us-gaap:NoncurrentAssets us-gaap:StatementGeographical

us-gaap:NoncurrentAssets

idcc:CanadaAndEurope


Noncurrent
Period End2020-12-31
Value23
Percentage of NoncurrentAssets100.0
Percentage of Assets1.4
Percentage of Assets idcc:CanadaAndEurope0.0

us-gaap:NoncurrentAssets us-gaap:StatementGeographical, us-gaap:PropertyPlantAndEquipmentByType

country:US, idcc:PropertyPlantAndEquipmentAndPatentsNet


Noncurrent
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value435446464336287
Percentage of NoncurrentAssets1883.10.00.00.00.0
Percentage of Assets26.927.728.618.116.6
Percentage of Assets country:US idcc:PropertyPlantAndEquipmentAndPatentsNet0.00.00.00.00.0

Assets Noncurrent

us-gaap:AssetsNoncurrent

us-gaap:AssetsNoncurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value574576589608617588595605604603602597419417458515502523506468503476463362343340351337306264255250250253242233237226228239246227255206
Percentage of AssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets38.436.936.537.140.140.237.037.239.140.837.033.425.925.724.726.627.328.029.332.434.237.431.425.023.523.429.426.021.524.523.022.221.725.022.921.027.624.322.923.523.727.229.222.7

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value3228413836636053545147
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.01.82.62.12.14.35.04.85.25.15.4

Furniture And Fixtures Gross

us-gaap:FurnitureAndFixturesGross

us-gaap:FurnitureAndFixturesGross


Furniture
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1051000.01121000.01549000.01279000.01247000.01513000.01292000.01166000.01578000.01357000.01202000.0
Percentage of FurnitureAndFixturesGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.1

Leasehold Improvements Gross

us-gaap:LeaseholdImprovementsGross

us-gaap:LeaseholdImprovementsGross


Leasehold
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1111119.7119.6927.5447.4066.4774.6554.534.287
Percentage of LeaseholdImprovementsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.70.50.60.50.60.60.40.50.5

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1618312724514743464338
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.21.91.51.43.54.03.94.44.34.4

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1415161611101010101010101010101111121211111212111110129.3149.3699.0989.5357.1957.3187.8247.0796.9527.2297.9977.457.6097.8928.34410
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.01.01.00.80.70.60.60.70.70.60.60.70.60.60.60.60.60.70.80.81.00.80.80.80.71.10.70.70.80.90.60.70.70.60.80.80.80.70.70.91.01.1

Long Term Investments

us-gaap:LongTermInvestments

us-gaap:LongTermInvestments


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value151417191412
Percentage of LongTermInvestments100.0100.0100.0100.0100.0100.0
Percentage of Assets1.00.91.11.00.80.9

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302020-12-312019-12-312018-12-312018-09-302017-12-312016-12-31
Value22222222221616
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.41.41.41.30.90.9

us-gaap:Goodwill us-gaap:Restatement

srt:ScenarioPreviouslyReported


Goodwillus-gaap:
Period End2020-12-31
Value22
Percentage of Goodwill100.1
Percentage of Assets1.4
Percentage of Assets srt:ScenarioPreviouslyReported0.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302020-12-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value19232416171213
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.31.41.51.01.10.90.0

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:BalanceSheetLocation

us-gaap:OtherNoncurrentAssets


Operating
Period End2020-12-312019-12-31
Value2224
Percentage of OperatingLeaseRightOfUseAsset96.5100.0
Percentage of Assets1.41.5
Percentage of Assets us-gaap:OtherNoncurrentAssets0.00.0

us-gaap:PrepaidExpensesAndOtherCurrentAssets


Operating
Period End2020-12-31
Value0.817
Percentage of OperatingLeaseRightOfUseAsset3.5
Percentage of Assets0.1
Percentage of Assets us-gaap:PrepaidExpensesAndOtherCurrentAssets0.0

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:Restatement

srt:ScenarioPreviouslyReported


Operating
Period End2020-12-31
Value22
Percentage of OperatingLeaseRightOfUseAsset96.5
Percentage of Assets1.4
Percentage of Assets srt:ScenarioPreviouslyReported0.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value95717476787976617166606350473737333433151513137.430.8050.9561.5432.0642.1672.2993.137191926262627282847434444
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.44.64.64.65.15.44.73.84.64.53.73.63.12.92.01.91.81.82.01.11.01.00.90.50.10.10.10.20.20.20.31.71.92.52.43.13.02.82.84.65.25.14.9

us-gaap:OtherAssetsNoncurrent us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Other
Period End2020-12-312019-12-31
Value0.01.3
Percentage of OtherAssetsNoncurrent0.01.7
Percentage of Assets0.00.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary0.02.1

us-gaap:OtherAssetsNoncurrent us-gaap:Restatement

srt:ScenarioPreviouslyReported


Other
Period End2020-12-31
Value74
Percentage of OtherAssetsNoncurrent100.0
Percentage of Assets4.6
Percentage of Assets srt:ScenarioPreviouslyReported0.0

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:ContractWithCustomerLiabilityCurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value158192219248141126146171111
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.612.313.615.19.28.69.110.56.9

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value234253295317203185305334242448179293128126376440379414425238371171399406398385205217245105126126166164172279165141173167164160178252
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets15.616.218.319.313.312.719.020.515.730.311.016.47.97.820.322.720.622.224.616.525.313.427.128.127.326.517.216.817.29.811.411.214.416.216.425.119.215.217.416.415.819.120.427.8

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value3170000.03437000.03624000.03963000.03382000.03519000.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.30.20.0

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312019-12-312011-03-312010-12-312009-12-31
Value271921117.424.7627.866
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.81.31.30.70.90.50.9

Long Term Debt

us-gaap:LongTermDebt us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:LongtermDebtType

us-gaap:LongTermDebt

idcc:AccountingStandardsUpdate202006, us-gaap:ConvertibleDebt


Long
Period End2021-01-01
Value-50.2
Percentage of LongTermDebt100.0
Percentage of Assets0.0
Percentage of Assets idcc:AccountingStandardsUpdate202006 us-gaap:ConvertibleDebt0.0

us-gaap:AccountingStandardsUpdate202006, us-gaap:ConvertibleDebt


Long
Period End2021-01-01
Value-50.2
Percentage of LongTermDebt100.0
Percentage of Assets0.0
Percentage of Assets us-gaap:AccountingStandardsUpdate202006 us-gaap:ConvertibleDebt0.0

us-gaap:LongTermDebt us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

idcc:AccountingStandardsUpdate202006, us-gaap:ConvertibleDebt, us-gaap:SubsequentEvent


Long
Period End2021-01-01
Value50
Percentage of LongTermDebt-100.0
Percentage of Assets0.0
Percentage of Assets idcc:AccountingStandardsUpdate202006 us-gaap:ConvertibleDebt us-gaap:SubsequentEvent0.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-03-312010-12-312009-12-31
Value420419367363359354350346342193173132912882852812782752722682652622592562532502172152132102082042022001981961941920.1040.180.468
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets28.126.922.822.223.324.221.721.322.21.319.517.518.017.715.414.615.114.815.718.618.120.617.617.717.417.218.216.615.019.518.817.719.919.017.822.820.819.30.00.00.1

us-gaap:LongTermDebtNoncurrent us-gaap:LongtermDebtType

us-gaap:ConvertibleDebt


Long
Period End2020-12-312019-12-31
Value343329
Percentage of LongTermDebtNoncurrent93.494.0
Percentage of Assets21.320.4
Percentage of Assets us-gaap:ConvertibleDebt0.00.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value12202319212224211.284
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.81.31.41.21.41.61.51.30.1

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value4344474845434636384834309.8869.764108.84416161410104.4713.9833.843.7533.962.5681.6920.9880.9040.2480.00.02.783.3772.9222.4795.6519.3914121011
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.92.93.02.93.03.02.92.32.53.32.11.70.60.60.50.50.90.90.90.80.70.40.30.30.30.30.20.10.10.10.00.00.00.30.30.30.30.60.91.41.51.21.2

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value232415161213
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0
Percentage of Assets1.41.51.01.10.90.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value5463000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets0.3

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value4727000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.3

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value4508000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.3

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value3585000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.2

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value8795000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.5

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value262719201617
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0
Percentage of Assets1.61.71.21.41.10.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value30
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets1.9

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value5423000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.3

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value70471277378376975276178278881292710001020101985582079274673960651349451048648447646852359452352854251450651856640845347144842137635316987137
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets47.045.647.847.750.051.447.248.051.154.957.056.063.062.746.142.443.140.042.842.135.038.834.633.633.132.739.240.441.748.547.548.044.649.949.150.847.448.647.343.940.544.940.418.70.00.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value716732796802790775786803800825938101510361035873832805760754615523505521491492484475530600529533547518505518
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets47.846.949.348.951.453.048.849.351.855.857.756.864.063.747.143.043.840.743.742.635.639.635.433.933.733.239.840.942.249.048.048.544.949.849.1

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:CumulativeEffectPeriodOfAdoption

srt:CumulativeEffectPeriodOfAdoptionAdjustment


Stockholders
Period End2020-12-312017-12-31
Value-50.184161
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-6.318.5
Percentage of Assets-3.18.7
Percentage of Assets srt:CumulativeEffectPeriodOfAdoptionAdjustment0.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:StatementEquityComponents

srt:CumulativeEffectPeriodOfAdoptionAdjustment, us-gaap:RetainedEarnings


Stockholders
Period End2020-12-312017-12-31
Value-50.184161
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-6.318.5
Percentage of Assets-3.18.7
Percentage of Assets srt:CumulativeEffectPeriodOfAdoptionAdjustment us-gaap:RetainedEarnings0.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value-0.323-0.254-0.1840.0080.37-0.042-0.074-0.105-0.35-1.426-2.471-3.436-3.903-4.279-2.083-0.514
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.0-0.0-0.00.00.0-0.0-0.0-0.0-0.0-0.2-0.3-0.3-0.4-0.4-0.2-0.1
Percentage of Assets-0.0-0.0-0.00.00.0-0.0-0.0-0.0-0.0-0.1-0.2-0.2-0.2-0.3-0.1-0.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value745738738735734729727725724683685683678672680683
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest104.1100.892.791.792.994.192.590.490.582.873.167.365.564.977.990.6
Percentage of Assets49.847.345.744.947.749.845.144.646.946.242.138.241.941.436.739.6
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value0.7150.7140.7140.7130.7130.7130.7120.7120.7120.7120.7110.7110.710.7090.7070.703
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value122023192122242111121.2845.0076.6497.8399.348.045
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest1.72.82.92.42.73.03.12.61.41.50.10.50.60.81.11.1
Percentage of Assets0.81.31.41.21.41.61.51.30.70.90.10.30.40.50.50.5
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value1349135814131426141314021412140914181421143514451435143712571127
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest188.4185.4177.5177.7178.7180.8179.7175.5177.3172.2153.1142.4138.6138.8144.0149.4
Percentage of Assets90.187.087.586.991.995.787.686.691.896.188.380.888.788.467.865.2
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value-1390.752-1385.361-1379.611-1379.611-1379.611-1379.611-1379.262-1354.262-1354.262-1291.979-1182.993-1115.995-1081.66-1078.512-1072.488-1064.795
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-194.2-189.1-173.2-171.9-174.5-177.9-175.4-168.6-169.2-156.5-126.1-109.9-104.4-104.1-122.8-141.2
Percentage of Assets-92.9-88.7-85.4-84.1-89.7-94.2-85.6-83.2-87.7-87.3-72.7-62.4-66.8-66.3-57.8-61.6
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312011-03-312010-12-312009-12-31
Value715000.0714000.0714000.0713000.0713000.0713000.0712000.0712000.0711000.0689000.0686000.0668000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.10.10.1

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value745738738735734729727725724683685683678672680675671667683675670666663657653651614611607599598586583579577575573573568563525
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets49.847.345.744.947.749.845.144.646.946.242.138.241.941.436.734.936.535.839.646.845.652.345.045.444.844.751.447.142.755.553.750.857.554.951.766.961.557.655.754.160.1

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-312017-12-312011-03-312010-12-312009-12-31
Value1349135814131426141314021412140914181421143514351437-1249.091414395246
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets90.187.087.586.991.995.787.686.691.896.188.388.788.4-67.449.445.327.2

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-323000.0-254000.0-184000.08000.0370000.0-42000.0-74000.0-105000.0-350000.0-1426000.0-2471000.0-3436000.0-3903000.0-4279000.0-2083000.0-695000.0-601000.0-559000.0-514000.024000.0210000.074000.0-178000.0-6000.0126000.0113000.0118000.0-168000.0368000.0-402000.0-14000.01112000.01019000.0864000.01007000.0298000.0298000.0-439000.0-429000.044000.0123000.0111000.0277000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.0-0.0-0.00.00.0-0.0-0.0-0.0-0.0-0.1-0.2-0.2-0.2-0.3-0.1-0.0-0.0-0.0-0.00.00.00.0-0.0-0.00.00.00.0-0.00.0-0.0-0.00.10.10.10.10.00.0-0.0-0.00.00.00.00.0

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value13901385137913791379137913791354135412911182111510811078107210641064106410641064105910401000992974954903839759751751721721721721646594569569569569569569
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets92.988.785.484.189.794.285.683.287.787.372.762.466.866.357.855.057.957.161.673.872.181.667.868.566.765.575.664.753.469.567.562.671.168.364.775.263.857.155.754.767.865.162.7

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value12202319212224211.284
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.81.31.41.21.41.61.51.30.1

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value3.7752.1531.2674.6292.0031.805-2.116-2.0962.239-1.8210.816
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value3.7752.1531.2674.6292.0031.8052.1162.0962.2391.8210.816
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0-100.0-100.0100.0-100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.0

Minority Interest Decrease From Distributions To Noncontrolling Interest Holders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders


Minority
Period End2021-03-31
Value1109000.0
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0
Percentage of Assets0.0

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Minority
Period End2021-03-31
Value1109000.0
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0
Percentage of Assets0.0
Percentage of Assets us-gaap:NoncontrollingInterest0.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-27.259-9.8421910169-26.88517125-22.742-30.781-29.8251706.827-0.59521710419-25.855233-10.17119116860.656251.7715515533-2.859-0.545-1.0314376-122.814341-15.625-25.705-1.778-1.303-26.05-5.207-29.221818.84672
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-31.1-11.921.2115.866.8-35.317.1173.0-30.1-44.8-39.6226.99.8-0.7105.9107.614.3-27.485.2-4.9252.215.177.40.721.31.665.0200.617.1-4.9-0.5-0.9212.0161.0-139.878.7-21.7-37.1-2.3-1.7-37.3-6.6-30.788.89.762.6

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value51-47.026-288.07-15.74288-94.5362489-18.52417372-125.24511011-54.78.31533-206.981-13.696-391.581-89.062275-46.918-4.355-184.8122275-83.708-30.399-102.107-25.655100-55.138-57.7422089-27.497-19.614-63.91632-1.364-8.731-85.16211-7.933-76.42
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax58.7-57.1-317.3-18.084.5-124.023.6123.7-24.5252.196.6-166.8159.513.2-26.68.524.4-219.0-5.0-188.0-117.3255.5-41.9-4.3-155.920.088.1-107.8-15.7-176.5-25.790.6-81.5-121.923.520.6-38.3-28.3-83.143.0-2.0-11.1-89.412.6-8.7-65.8

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-13.209-19.87-5.565-10.836-10.503-105.952-30.616-12.14867-114.377-78.96-44.148-11.493-26.456-13.302-10.459-10.637-32.165-2.674-12.474-25.291-277.467-7.295-25.694-20.647234-72.121-86.287-11.148-1.295-31.629-2.671.9610.349-68.899-79.258-56.521-28.264-1.748-1.492206-1.396163.0022.157.223
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-15.1-24.1-6.1-12.4-10.1-139.0-30.0-16.889.7-166.7-104.8-58.8-16.5-30.3-6.5-10.7-7.8-34.0-1.0-6.0-33.3-257.5-6.5-25.6-17.4212.7-83.7-111.2-5.7-2.2-31.7-2.42.90.7-78.4-18.3-78.6-40.8-2.3-2.0296.1-1.817.03.32.46.2

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value11-76.738-274.3874147-227.373102032627-36.038
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.6-93.2-302.285.5141.2-298.410.7280.035.140.6-47.8

Amortization Of Financing Costs

us-gaap:AmortizationOfFinancingCosts

us-gaap:AmortizationOfFinancingCosts


Amortization
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value297000.0291000.0358000.0409000.0380000.0364000.0348000.0347000.0347000.0347000.0347000.0348000.0347000.0347000.0348000.0347000.0347000.0673000.0695000.0675000.0675000.0442000.0326000.0326000.0326000.0326000.0325000.0326000.0326000.0326000.0325000.0326000.0326000.0326000.0325000.0326000.0326000.0000
Percentage of AmortizationOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:AmortizationOfFinancingCosts us-gaap:DebtInstrument, us-gaap:LongtermDebtType

idcc:ConvertibleNotes2020, us-gaap:ConvertibleDebt


Amortization
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value00070000.0104000.0104000.0266000.0347000.0348000.0347000.0347000.0347000.0347000.0348000.0347000.0347000.0347000.0347000.0347000.0349000.0349000.0116000.0000
Percentage of AmortizationOfFinancingCosts0.00.00.019.625.427.473.10.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.051.651.751.726.20.00.00.0

idcc:ConvertibleNotes2024, us-gaap:ConvertibleDebt


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-09-30
Value402000.0398000.0300000.0297000.0291000.0288000.0280000.0276000.098000.00
Percentage of AmortizationOfFinancingCosts0.00.00.0100.0100.080.468.572.626.90.0

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1.3561.402-6.169-0.75110-2.3-2.913-2.801-22.022-18.306-3.816-5.55178-1.68615-21.4442439-29.709-11.291-24.6885.984-7.988-6.559-30.0-25.244-7.306-7.593-5.809194.972-10.59441-9.5693.3363.977-8.7449.133-12.5981019-18.810.09-7.45
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value191920202119201919181917141414141314131313121211111111129.0219.3519.3227.8518.2337.9797.0356.6276.2996.2876.0795.9755.9095.8425.675.6525.3215.482
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-0.084-0.291-1.1751.9-1.098-2.4771.9090.558-9.2746.1690.5638.498-3.9411.083-0.5910.039-5.7532.5161.64-6.4440.472-1.2322.4941.4622.926-4.3793.62-1.5732.176-14.61915-2.4425.452-3.537-5.8857.4322.385-1.4791.696-0.163-1.154-0.95-1.8170.531-0.7642.467
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-27.259-9.8421910169-26.88517125-22.742-30.781-29.8251706.827-0.59521710419-25.855233-10.17119116860.656251.7715515533-2.859-0.545-1.0314376-122.814341-15.625-25.705-1.778-1.303-26.05-5.207-29.221818.84672
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-31.1-11.921.2115.866.8-35.317.1173.0-30.1-44.8-39.6226.99.8-0.7105.9107.614.3-27.485.2-4.9252.215.177.40.721.31.665.0200.617.1-4.9-0.5-0.9212.0161.0-139.878.7-21.7-37.1-2.3-1.7-37.3-6.6-30.788.89.762.6

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.6185.571-1.3523220.116132.2347.743-2.8031.8321102952355233136104392833243229131378-1.86114269.238-12.269152359.673102226172334353448
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.86.8-1.527.221.30.213.53.110.2-4.12.428.515.434.225.636.538.735.749.850.252.726.029.524.427.526.316.017.440.6-3.214.624.113.6-25.917.754.313.515.829.634.324.629.736.038.638.442.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1.6185.57123220.1162.2347.743-2.803211030
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0101.6102.4101.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.86.827.221.30.23.110.2-4.129.015.834.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-6.7973.958-2.8912120-1.661110.8356.378-4.2140.86209.7762855345132139103392735233128161278-2.55516268.606-12.903152359.67310
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-7.74.8-3.225.019.7-2.211.71.28.4-6.11.126.814.132.926.935.738.034.750.949.751.425.231.423.727.025.718.816.340.2-4.416.423.612.7-27.217.754.313.515.8

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.7752.1532.5431.2684.6282.0031.5861.8052.1162.0962.2142.2381.8210.8164.1613.9234.6615.3176.5394.7213.9376.6435.4483.3923.3212.9785.0363.7377.6122.10913-5.1832.2735.5181.8581.5021.5631.5722.0792.6691.6911.6761.8671.31.1921.442
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value51-47.026-288.07-15.74288-94.5362489-18.52417372-125.24511011-54.78.31533-206.981-13.696-391.581-89.062275-46.918-4.355-184.8122275-83.708-30.399-102.107-25.655100-55.138-57.7422089-27.497-19.614-63.91632-1.364-8.731-85.16211-7.933-76.42
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax58.7-57.1-317.3-18.084.5-124.023.6123.7-24.5252.196.6-166.8159.513.2-26.68.524.4-219.0-5.0-188.0-117.3255.5-41.9-4.3-155.920.088.1-107.8-15.7-176.5-25.790.6-81.5-121.923.520.6-38.3-28.3-83.143.0-2.0-11.1-89.412.6-8.7-65.8

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.550.3871.9186.1042.1681.6031.4470.21.2781.5840.6940.341.1430.3991.1290.1170.5570.2682.4051.2110.6721.5941.8650.5060.4910.8383.8991.730.2461.221.8591.5520.7510.4291.6420.9490.4990.5311.3120.6970.8950.9310.7820.650.6460.442
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-13.209-19.87-5.565-10.836-10.503-105.952-30.616-12.14867-114.377-78.96-44.148-11.493-26.456-13.302-10.459-10.637-32.165-2.674-12.474-25.291-277.467-7.295-25.694-20.647234-72.121-86.287-11.148-1.295-31.629-2.671.9610.349-68.899-79.258-56.521-28.264-1.748-1.492206-1.396163.0022.157.223
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-15.1-24.1-6.1-12.4-10.1-139.0-30.0-16.889.7-166.7-104.8-58.8-16.5-30.3-6.5-10.7-7.8-34.0-1.0-6.0-33.3-257.5-6.5-25.6-17.4212.7-83.7-111.2-5.7-2.2-31.7-2.42.90.7-78.4-18.3-78.6-40.8-2.3-2.0296.1-1.817.03.32.46.2

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-05-312019-05-292019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.00.00.0940.00.02212212210.00.00.00.00.00.00.00.00.00.02300.00.00.00.0
Percentage of RepaymentsOfLongTermDebt0.00.00.0100.00.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.00.0

Payments Of Dividends

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value101010101010101011111112121212101010106.8586.9237.0687.0937.1797.2327.4337.6098.0324.0454.0434.1214.1184.1150.0694.3484.474.574.5484.544.5364.5260.00.0
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0

Dividends

us-gaap:Dividends

us-gaap:Dividends


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1010101010101011-84.234111212-78.088121010-58.43106.8616.923-50.2067.1837.2437.2327.57.3178.2914.0454.0334.11912-4.115
Percentage of Dividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Dividends us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Dividendsus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-0.158-0.21-0.145-0.136-0.084-0.0950.1040.103-0.1270.1020.115
Percentage of Dividends-1.5-2.0-1.3-1.3-0.8-0.91.00.9-1.10.80.9

us-gaap:RetainedEarnings


Dividendsus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1010101010101011121212
Percentage of Dividends101.5102.0101.3101.3100.8100.9101.0100.9101.1100.8101.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value5.3915.750.00.00.00.349250.06210866343.1486.0247.6930.00.00.00.05.6918407.35818195064798.4540.0290.00.00.00.07452250.00.00.00.0
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.00.00.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.00.00.0100.0100.0100.00.00.00.00.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-30
Value-38.016.531-11.17811.447-0.0771.096-0.296-0.299-1.5990.633-0.0950.2060.6140.034-0.2840.0520.493-0.2570.382-0.3410.730.0040.007-0.3840.6770.037-0.012-0.3620.8330.105-0.045-0.4740.6830.004-0.6950.344-0.082-0.0030.3580.001
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value711000.0825000.0695000.0531000.0515000.0421000.0336000.0245000.0210000.0342000.0675000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber us-gaap:PlanName

idcc:PriorThan2017Plan


Share
Period End2020-12-31
Value100000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber14.1

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value50.8558.8357.2139.5537.3831.1624.922.6116.3914.3713.94
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value807375691381591255564104103
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value14413312512389817170687864
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Proceeds From Sale Of Short Term Investments

us-gaap:ProceedsFromSaleOfShortTermInvestments

us-gaap:ProceedsFromSaleOfShortTermInvestments


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value21613761621082333888318381691291187332112423146364230821015034100131565511912518867629615271121187148182184111217119121
Percentage of ProceedsFromSaleOfShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:CapitalizedPatentCosts

idcc:CapitalizedPatentCosts


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value109.6026.8899.8777.5936.2567.3588.2839.3598.4818.2249.3386.4728.0358.6279.7558.7647.7878.3847.9068.3068.0625.767.8157.7648.4278.6076.2139.2297.883126.8029.8124.9238.5344.9186.2388.6277.7446.3026.4556.6717.8516.0957.0136.855
Percentage of CapitalizedPatentCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:DilutiveSecuritiesEffectOnBasicEarningsPerSharePerShare

idcc:DilutiveSecuritiesEffectOnBasicEarningsPerSharePerShare


Dilutive
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.010.0100-0.0100.0100.010.02
Percentage of DilutiveSecuritiesEffectOnBasicEarningsPerSharePerShare100.0100.00.00.0100.00.0100.00.0100.0100.0

idcc:DiscreteTaxExpenseBenefit

idcc:DiscreteTaxExpenseBenefit


Discrete
Period End2021-06-302021-03-312020-09-30
Value300000.0300000.0-18500000.0
Percentage of DiscreteTaxExpenseBenefit100.0100.0100.0

idcc:IncreaseDecreaseInCapitalAndIntangibleAssetExpendituresIncurredButNotYetPaid

idcc:IncreaseDecreaseInCapitalAndIntangibleAssetExpendituresIncurredButNotYetPaid


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1465000.02096000.0-17000.0323000.0-2030000.01288000.02009000.01520000.0-2966000.01056000.0-4302000.0
Percentage of IncreaseDecreaseInCapitalAndIntangibleAssetExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:IncreaseDecreaseInDisaggregatedRevenue

idcc:IncreaseDecreaseInDisaggregatedRevenue


Increase
Period End2021-06-302021-03-31
Value-16763000.06153000.0
Percentage of IncreaseDecreaseInDisaggregatedRevenue100.0100.0

idcc:IncreaseDecreaseInDisaggregatedRevenue us-gaap:ContractWithCustomerBasisOfPricing

idcc:VariablePriceContract


Increase
Period End2021-06-302021-03-31
Value2726000.01150000.0
Percentage of IncreaseDecreaseInDisaggregatedRevenue-16.318.7

us-gaap:FixedPriceContract


Increase
Period End2021-06-302021-03-31
Value-8042000.02949000.0
Percentage of IncreaseDecreaseInDisaggregatedRevenue48.047.9

idcc:IncreaseDecreaseInDisaggregatedRevenue us-gaap:ProductOrService

idcc:PatentLicensingRoyalties


Increase
Period End2021-06-302021-03-31
Value-14979000.07175000.0
Percentage of IncreaseDecreaseInDisaggregatedRevenue89.4116.6

idcc:TechnologySolutions


Increase
Period End2021-06-302021-03-31
Value-1784000.0-1022000.0
Percentage of IncreaseDecreaseInDisaggregatedRevenue10.6-16.6

idcc:IncreaseDecreaseInDisaggregatedRevenue us-gaap:ProductOrService, us-gaap:ContractWithCustomerDuration

idcc:PatentLicensingRoyalties, us-gaap:LongTermContractWithCustomer


Increase
Period End2021-06-302021-03-31
Value-9663000.03076000.0
Percentage of IncreaseDecreaseInDisaggregatedRevenue57.650.0

idcc:PatentLicensingRoyalties, us-gaap:ShortTermContractWithCustomer


Increase
Period End2021-06-302021-03-31
Value-5316000.04099000.0
Percentage of IncreaseDecreaseInDisaggregatedRevenue31.766.6

idcc:IncreaseDecreaseInInterestAndInvestmentIncome

idcc:IncreaseDecreaseInInterestAndInvestmentIncome


Increase
Period End2021-03-31
Value-2300000.0
Percentage of IncreaseDecreaseInInterestAndInvestmentIncome100.0

idcc:IncreaseDecreaseinDisaggregatedRevenue

idcc:IncreaseDecreaseinDisaggregatedRevenue


Increase
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value14287.579-2.5566.054-18.813-22.246
Percentage of IncreaseDecreaseinDisaggregatedRevenue100.0100.0100.0100.0100.0100.0100.0

idcc:IncreaseDecreaseinDisaggregatedRevenue us-gaap:ProductOrService

idcc:CurrentPatentRoyalties


Increase
Period End2020-09-302020-06-302020-03-312019-09-30
Value169.6050.14-5.498
Percentage of IncreaseDecreaseinDisaggregatedRevenue108.933.21.8215.1

idcc:CurrentTechnologySolutions


Increase
Period End2020-09-302020-06-302020-03-312019-09-30
Value-1.4531.2721.1842.69
Percentage of IncreaseDecreaseinDisaggregatedRevenue-9.74.415.6-105.2

idcc:FixedFeeRoyaltyRevenue


Increase
Period End2020-09-302020-06-302020-03-312019-09-30
Value13133.4743.464
Percentage of IncreaseDecreaseinDisaggregatedRevenue90.947.145.8-135.5

idcc:NonCurrentPatentRoyalties


Increase
Period End2020-09-302020-06-302020-03-312019-09-30
Value0.877186.48-0.498
Percentage of IncreaseDecreaseinDisaggregatedRevenue5.962.385.519.5

idcc:PatentLicensingRoyalties


Increase
Period End2020-09-302020-06-302020-03-312019-09-30
Value17276.62-5.996
Percentage of IncreaseDecreaseinDisaggregatedRevenue114.795.687.3234.6

idcc:PatentSales


Increase
Period End2020-09-302020-06-302020-03-312019-09-30
Value-0.750.0-0.2250.75
Percentage of IncreaseDecreaseinDisaggregatedRevenue-5.00.0-3.0-29.3

idcc:VariablePatentRoyaltyRevenue


Increase
Period End2020-09-302020-06-302020-03-312019-09-30
Value2.694-3.997-3.334-8.962
Percentage of IncreaseDecreaseinDisaggregatedRevenue18.0-13.8-44.0350.6

idcc:NonCashChangeinFairValue

idcc:NonCashChangeinFairValue


Non
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-87000.000-5501000.0000710000.03884000.0000
Percentage of NonCashChangeinFairValue100.00.00.0100.00.00.00.0100.0100.00.00.00.0

idcc:PatentAdministrationAndLicensing

idcc:PatentAdministrationAndLicensing


Patent
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value403651403840463437363832262627282529312628272928313136333033363633363145262321171615131214
Percentage of PatentAdministrationAndLicensing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:PercentageIncreaseDecreaseInDisaggregatedRevenue

idcc:PercentageIncreaseDecreaseInDisaggregatedRevenue


Percentage
Period End2021-06-302021-03-31
Value-16.08.0
Percentage of PercentageIncreaseDecreaseInDisaggregatedRevenue100.0100.0

idcc:PercentageIncreaseDecreaseInDisaggregatedRevenue us-gaap:ContractWithCustomerBasisOfPricing

idcc:VariablePriceContract


Percentage
Period End2021-06-302021-03-31
Value59.019.0
Percentage of PercentageIncreaseDecreaseInDisaggregatedRevenue-368.8237.5

us-gaap:FixedPriceContract


Percentage
Period End2021-06-302021-03-31
Value-10.04.0
Percentage of PercentageIncreaseDecreaseInDisaggregatedRevenue62.550.0

idcc:PercentageIncreaseDecreaseInDisaggregatedRevenue us-gaap:ProductOrService

idcc:PatentLicensingRoyalties


Percentage
Period End2021-06-302021-03-31
Value-15.010.0
Percentage of PercentageIncreaseDecreaseInDisaggregatedRevenue93.8125.0

idcc:TechnologySolutions


Percentage
Period End2021-06-302021-03-31
Value-54.0-32.0
Percentage of PercentageIncreaseDecreaseInDisaggregatedRevenue337.5-400.0

idcc:PercentageIncreaseDecreaseInDisaggregatedRevenue us-gaap:ProductOrService, us-gaap:ContractWithCustomerDuration

idcc:PatentLicensingRoyalties, us-gaap:LongTermContractWithCustomer


Percentage
Period End2021-06-302021-03-31
Value-50.0436.0
Percentage of PercentageIncreaseDecreaseInDisaggregatedRevenue312.55450.0

idcc:PatentLicensingRoyalties, us-gaap:ShortTermContractWithCustomer


Percentage
Period End2021-06-302021-03-31
Value-6.06.0
Percentage of PercentageIncreaseDecreaseInDisaggregatedRevenue37.575.0

idcc:PercentageIncreaseDecreaseinDisaggregatedRevenue

idcc:PercentageIncreaseDecreaseinDisaggregatedRevenue


Percentage
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value21.00.380.11-0.030.0900
Percentage of PercentageIncreaseDecreaseinDisaggregatedRevenue100.0100.0100.0100.0100.00.00.0

idcc:PercentageIncreaseDecreaseinDisaggregatedRevenue us-gaap:ProductOrService

idcc:CurrentPatentRoyalties


Percentage
Period End2020-09-302020-06-302020-03-312019-09-30
Value24.00.130-0.07
Percentage of PercentageIncreaseDecreaseinDisaggregatedRevenue114.334.20.0233.3

idcc:CurrentTechnologySolutions


Percentage
Period End2020-09-302020-06-302020-03-312019-09-30
Value-39.00.620.582.6
Percentage of PercentageIncreaseDecreaseinDisaggregatedRevenue-185.7163.2527.3-8666.7

idcc:FixedFeeRoyaltyRevenue


Percentage
Period End2020-09-302020-06-302020-03-312019-09-30
Value21.00.210.060.06
Percentage of PercentageIncreaseDecreaseinDisaggregatedRevenue100.055.354.5-200.0

idcc:NonCurrentPatentRoyalties


Percentage
Period End2020-09-302020-06-302020-03-312019-09-30
Value237.014.561.12-3.89
Percentage of PercentageIncreaseDecreaseinDisaggregatedRevenue1128.63831.61018.212966.7

idcc:PatentLicensingRoyalties


Percentage
Period End2020-09-302020-06-302020-03-312019-09-30
Value25.00.380.1-0.08
Percentage of PercentageIncreaseDecreaseinDisaggregatedRevenue119.0100.090.9266.7

idcc:VariablePatentRoyaltyRevenue


Percentage
Period End2020-09-302020-06-302020-03-312019-09-30
Value58.0-0.47-0.36-0.66
Percentage of PercentageIncreaseDecreaseinDisaggregatedRevenue276.2-123.7-327.32200.0

idcc:RestructuringAndRelatedActivitiesReimbursementArrangements

idcc:RestructuringAndRelatedActivitiesReimbursementArrangements


Restructuring
Period End2021-06-30
Value10
Percentage of RestructuringAndRelatedActivitiesReimbursementArrangements100.0

idcc:UnsettledRepurchasesOfCommonStock

idcc:UnsettledRepurchasesOfCommonStock


Unsettled
Period End2021-03-31
Value1994000.0
Percentage of UnsettledRepurchasesOfCommonStock100.0

us-gaap:AmortizationOfDebtDiscountPremium

us-gaap:AmortizationOfDebtDiscountPremium


Amortization
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302018-09-302018-06-30
Value3.3233.2553.8914.0923.6213.1243.094
Percentage of AmortizationOfDebtDiscountPremium100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfDebtDiscountPremium us-gaap:DebtInstrument, us-gaap:LongtermDebtType

idcc:ConvertibleNotes2020, us-gaap:ConvertibleDebt


Amortization
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.00.00.00.6691.0041.0042.523.2153.1823.1243.094
Percentage of AmortizationOfDebtDiscountPremium0.00.00.017.20.024.569.60.00.0100.0100.0

idcc:ConvertibleNotes2024, us-gaap:ConvertibleDebt


Amortization
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-09-30
Value3.3573.3233.2553.2223.1333.0881.1010.0
Percentage of AmortizationOfDebtDiscountPremium0.0100.0100.082.80.075.530.40.0

us-gaap:AmortizationOfFinancingCostsAndDiscounts

us-gaap:AmortizationOfFinancingCostsAndDiscounts


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value2.0421.8194.8914.5534.0124.6375.1235.0234.4814.0822.8253.8633.4413.383.3523.2953.2573.2013.1743.1193.0935.8665.8615.7085.6593.6412.662.582.582.5052.5042.4322.4312.3592.3592.2912.292.2252.223
Percentage of AmortizationOfFinancingCostsAndDiscounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfFinancingCostsAndDiscounts us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

idcc:AccountingStandardsUpdate202006, us-gaap:ConvertibleDebt, us-gaap:SubsequentEvent


Amortization
Period End2021-01-01
Value0.5
Percentage of AmortizationOfFinancingCostsAndDiscounts0.0

us-gaap:BusinessCombinationIntegrationRelatedCosts us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationIntegrationRelatedCosts

idcc:TechnicolorPatentAcquisition


Business
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.50.60.60.71.52.11.73.0
Percentage of BusinessCombinationIntegrationRelatedCosts100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStockDividendsPerShareDeclared


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.350.350.350.350.350.350.350.350.350.350.350.350.350.350.30.30.30.30.20.20.20.20.20.20.20.20.20.10.10.10.10.11.60.10.10.10.10.10.10.10.1000
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:MajorCustomers, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:ConcentrationRiskPercentage1

idcc:FiveLargestLicensees, us-gaap:AccountsReceivable, us-gaap:CustomerConcentrationRisk


Concentration
Period End2021-03-312020-03-31
Value50.00.66
Percentage of ConcentrationRiskPercentage1100.0100.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:ContractWithCustomerLiabilityRevenueRecognized


Contract
Period End2021-06-302021-03-312020-12-31
Value616221
Percentage of ContractWithCustomerLiabilityRevenueRecognized100.0100.0100.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1010101010101011111112121212101010106.8616.9237.0687.1837.2437.2327.57.6668.2914.0454.0314.1194.1184.115654.0954.3484.4694.574.5494.544.5354.5260.00.00.0
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:EquitySecuritiesFvNiUnrealizedGain

us-gaap:EquitySecuritiesFvNiUnrealizedGain


Equity
Period End2021-06-302020-03-31
Value1000000.05500000.0
Percentage of EquitySecuritiesFvNiUnrealizedGain100.0100.0

us-gaap:GainLossOnSaleOfInvestments

us-gaap:GainLossOnSaleOfInvestments


Gain
Period End2021-06-302021-03-312020-06-302020-03-312018-12-312018-09-30
Value-900000.01900000.01100000.04400000.00-8400000.0
Percentage of GainLossOnSaleOfInvestments100.0100.0100.0100.00.0100.0

us-gaap:ImpairmentOfIntangibleAssetsExcludingGoodwill

us-gaap:ImpairmentOfIntangibleAssetsExcludingGoodwill


Impairment
Period End2021-06-30
Value11
Percentage of ImpairmentOfIntangibleAssetsExcludingGoodwill100.0

us-gaap:ImpairmentOfIntangibleAssetsExcludingGoodwill us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:Patents


Impairment
Period End2021-06-30
Value11
Percentage of ImpairmentOfIntangibleAssetsExcludingGoodwill100.0

us-gaap:IncreaseDecreaseInAccruedTaxesPayable

us-gaap:IncreaseDecreaseInAccruedTaxesPayable


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.2390.019-0.1230.174-0.142-0.4440.63-1.501-96.514970.435-5.97-16.386-7.485-0.43828-5.363.986-1.83412-13.110.1842.86611-10.759-32.36641-4.4755.3240.230.264-2.722-129.7911290.1341.167-0.495-6.6390.807-0.858-28.34-18.892
Percentage of IncreaseDecreaseInAccruedTaxesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes


Increase
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.5921.8176.1690.751
Percentage of IncreaseDecreaseInDeferredIncomeTaxes100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredRevenue

us-gaap:IncreaseDecreaseInDeferredRevenue


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-63.23-23.429-28.6697516-39.512-8.62463-19.331-43.423-2.85636-34.9967.829271422.7771852024120180220.27618722.01314242142220154111454.656.852179.0971218179.73519438.575
Percentage of IncreaseDecreaseInDeferredRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherAccruedLiabilities

us-gaap:IncreaseDecreaseInOtherAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value14-16.2346.1878.3884.311-5.0713.2714.10215-13.4045.872-2.7134.876-7.781-1.422.5555.452-9.80515-0.1956.084-19.3569.64-3.3550.894-19.476-0.6446.2141.7-1.417-5.1858.446-7.663-20.1220-2.8445.011-0.9741.1140.0641.2142.658-1.197-0.221-1.8440.158
Percentage of IncreaseDecreaseInOtherAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingAssets

us-gaap:IncreaseDecreaseInOtherOperatingAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7.015-0.631-0.48925-0.1881.65825-4.2827.105-0.642-69.84856-2.3079.16.112.102-2.27213-37.92-2.26231.3447.20.831-3.0273.485-1.6464.6114.991-1.8-9.996-0.376-0.2280.847200.5132.396-2.181-22.6581.274-0.6791.343.88-1.885-0.313-0.856
Percentage of IncreaseDecreaseInOtherOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-0.499-3.507-11.3648.902-6.228-2.6644.917-33.82823-1.72568-53.33440-24.396-159.4911.082-3.489174-262.94242-10.42760-66.5437.3625.64851-30.218-212.159292-23.7841796.7839.097-118.362133-2.5317.8042.95-0.943-0.7127.158-11.0563.83-129.284
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestAndOtherIncome

us-gaap:InterestAndOtherIncome


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.4460.5530.6170.8251.3422.8772.2853.6843.5923.1523.5773.744.35
Percentage of InterestAndOtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseDebtExcludingAmortization

us-gaap:InterestExpenseDebtExcludingAmortization


Interest
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value2000000.02000000.02237000.02356000.01527000.01185000.01185000.01185000.01185000.01185000.01185000.01185000.01185000.01186000.01185000.01185000.02623000.02622000.02623000.02491000.01833000.01437000.01438000.01438000.01438000.01437000.01438000.01438000.01438000.01437000.01438000.01438000.01438000.01438000.01437000.01438000.00
Percentage of InterestExpenseDebtExcludingAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:InterestExpenseDebtExcludingAmortization us-gaap:DebtInstrument, us-gaap:LongtermDebtType

idcc:ConvertibleNotes2020, us-gaap:ConvertibleDebt


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value000237000.0356000.0356000.0927000.01185000.01185000.01185000.01185000.01185000.01185000.01185000.01185000.01185000.01185000.01185000.01185000.01185000.01053000.0395000.0000
Percentage of InterestExpenseDebtExcludingAmortization0.00.00.010.60.015.160.70.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.045.245.242.321.50.00.00.0

idcc:ConvertibleNotes2024, us-gaap:ConvertibleDebt


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-09-30
Value2000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.0600000.00
Percentage of InterestExpenseDebtExcludingAmortization0.00.00.0100.0100.089.40.084.939.30.0

us-gaap:NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1

us-gaap:NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1


Noncash
Period End2020-12-312020-09-302019-12-312019-09-302018-12-312017-12-31
Value0.00.00.0220.019
Percentage of NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired10.00.00.0100.00.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-69000.0-70000.0-192000.0-362000.0412000.032000.031000.0245000.01076000.01045000.0965000.0467000.0376000.0-1747000.0-1388000.0-94000.0-42000.0-45000.0-186000.0136000.0252000.0-132000.013000.0-5000.0286000.0-536000.0770000.0-388000.0-168000.0-958000.093000.0155000.0-143000.0709000.00737000.0-10000.0-473000.0-79000.012000.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-69000.0-70000.0-362000.0412000.032000.0245000.01076000.01045000.0467000.0376000.0-1747000.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:OtherOperatingActivitiesCashFlowStatement


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value475000.0-322000.0-849000.01108000.000-1000.0624000.0-623000.0169000.033000.0-4000.02000.0-3000.0-2000.01000.011000.0-138000.054000.0-141000.0152000.0-545000.092000.0539000.0316000.0-32000.0-100000.0388000.0-214000.0581000.080000.0-23000.0-64000.0-695000.0834000.015000.063000.0-47000.0-315000.061000.010000.0-91000.0
Percentage of OtherOperatingActivitiesCashFlowStatement100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingIncomeExpenseNet

us-gaap:OtherOperatingIncomeExpenseNet


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-30
Value3.0390.7243.1183.9943.7896.0235.297.80312-5.86330-13.953-4.847-6.33616-2.187-2.33-2.814-3.798-0.706-7.137-8.108-7.746-5.236-3.167-3.602-3.964-2.952.899
Percentage of OtherOperatingIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherRestructuringCosts

us-gaap:OtherRestructuringCosts


Other
Period End2021-06-30
Value1200000.0
Percentage of OtherRestructuringCosts100.0

us-gaap:PaymentsForProceedsFromLongtermInvestments

us-gaap:PaymentsForProceedsFromLongtermInvestments


Payments
Period End2021-06-302021-03-312020-12-31
Value0.01.091-0.025
Percentage of PaymentsForProceedsFromLongtermInvestments0.0100.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value0.7112.9620.2160.0550.7550.7250.0520.1790.044.0970.3280.0910.1118.2770.5620.0460.235210.013
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireShortTermInvestments

us-gaap:PaymentsToAcquireShortTermInvestments


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value15417334166101100.1660.196910.707-0.007417.02594116301824290.9154181211924413921048431315021212479111102645679131242109176185187199119190
Percentage of PaymentsToAcquireShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToMinorityShareholders

us-gaap:PaymentsToMinorityShareholders


Payments
Period End2021-06-302021-03-31
Value01109000.0
Percentage of PaymentsToMinorityShareholders0.0100.0

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProceedsFromStockOptionsExercised


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value3.6320.7370.10.01.0140.7780.00.00.00.0020.3612.4323.930.00.30.00.00.0820.1830.0740.2280.00.0170.0030.0260.00.0330.0160.010.3430.2980.0930.4320.2091.3980.1230.350.240.4471.0980.342.612102.16
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.00.0100.0100.00.00.00.0100.0100.0100.0100.00.0100.00.00.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringCostsAndAssetImpairmentCharges

us-gaap:RestructuringCostsAndAssetImpairmentCharges


Restructuring
Period End2021-06-30
Value13
Percentage of RestructuringCostsAndAssetImpairmentCharges100.0

us-gaap:SeveranceCosts1

us-gaap:SeveranceCosts1


Severance
Period End2021-06-30
Value11
Percentage of SeveranceCosts1100.0

us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value41000.055000.02000.036000.027000.07000.010000.0116000.02000.012000.0208000.0
Percentage of StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-06-302020-03-312018-09-302018-06-30
Value71000.032000.019000.027000.056000.090000.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-0.711-2.962-0.055-0.755-0.725-0.1790.044.097-0.0910.1118.277
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-0.711-2.962-0.055-0.755-0.725-0.1790.044.098-0.0910.1118.279
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised


Stock
Period End2021-06-302021-03-312020-06-302020-03-312019-03-312018-09-302018-06-30
Value3.6320.7371.0140.7780.0022.432-3.931
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-06-302020-03-312019-03-312018-09-302018-06-30
Value3.6310.7371.0140.7770.0022.431-3.93
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.099.9100.0100.0100.0

us-gaap:CommonStock


Stock
Period End2021-06-302020-03-312019-03-312018-09-302018-06-30
Value0.0010.0010.00.0010.001
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised0.00.10.00.0-0.0

us-gaap:TreasuryStockSharesAcquired us-gaap:StatementEquityComponents

us-gaap:TreasuryStockSharesAcquired

us-gaap:TreasuryStock


Treasury
Period End2021-06-302021-03-312020-03-312019-06-302019-03-312018-09-302018-06-302018-03-31
Value82000.091000.06000.0944000.01585000.0424000.040000.084000.0
Percentage of TreasuryStockSharesAcquired100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:TreasuryStockValueAcquiredCostMethod


Treasury
Period End2021-06-302021-03-312020-03-312019-06-302019-03-312018-09-302018-06-302018-03-31
Value5.3915.750.349-62.283-108.986343.1486.024
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:StatementEquityComponents

us-gaap:TreasuryStock


Treasury
Period End2021-06-302021-03-312020-03-312019-06-302019-03-312018-09-302018-06-302018-03-31
Value5.3915.750.34962108343.1486.024
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0-100.0-100.0100.0100.0100.0

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value385000.0359000.0315000.0288000.0198000.0178000.0229000.00956000.0862000.0965000.0679000.01216000.01850000.0673000.0446000.0332000.0407000.0420000.0375000.0571000.0379000.00263000.0295000.00329000.0263000.0545000.0818000.0474000.0566000.0735000.0735000.0
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:AccountsReceivableAfterAllowanceForCreditLossAndPrepaidAssets us-gaap:ConsolidatedEntities

idcc:AccountsReceivableAfterAllowanceForCreditLossAndPrepaidAssets

us-gaap:VariableInterestEntityPrimaryBeneficiary


Accounts
Period End2021-06-302021-03-312020-12-312020-09-30
Value7500000.02400000.02300000.02000000.0
Percentage of AccountsReceivableAfterAllowanceForCreditLossAndPrepaidAssets100.0100.0100.0100.0

idcc:ComputerEquipmentAndSoftwareGross

idcc:ComputerEquipmentAndSoftwareGross


Computer
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1611202018302725282524
Percentage of ComputerEquipmentAndSoftwareGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:DebtIssuanceCostsEquityComponent us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:LongtermDebtType

idcc:DebtIssuanceCostsEquityComponent

idcc:AccountingStandardsUpdate202006, us-gaap:ConvertibleDebt


Debt
Period End2021-01-01
Value1400000.0
Percentage of DebtIssuanceCostsEquityComponent100.0

us-gaap:AccountingStandardsUpdate202006, us-gaap:ConvertibleDebt


Debt
Period End2021-01-01
Value1400000.0
Percentage of DebtIssuanceCostsEquityComponent100.0

idcc:DebtIssuanceCostsEquityComponent us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

idcc:AccountingStandardsUpdate202006, us-gaap:ConvertibleDebt, us-gaap:SubsequentEvent


Debt
Period End2021-01-01
Value1900000.0
Percentage of DebtIssuanceCostsEquityComponent135.7

idcc:DeferredTaxAssetAmortizationOfIntangibles

idcc:DeferredTaxAssetAmortizationOfIntangibles


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2218181624211816131111
Percentage of DeferredTaxAssetAmortizationOfIntangibles100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:DeferredTaxAssetLiabilityDepreciationNet

idcc:DeferredTaxAssetLiabilityDepreciationNet


Deferred
Period End2020-12-312019-12-31
Value-1233000.0443000.0
Percentage of DeferredTaxAssetLiabilityDepreciationNet100.0100.0

idcc:DeferredTaxAssetOTTI

idcc:DeferredTaxAssetOTTI


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value0.4411.1380.490.450.6190.5410102.626
Percentage of DeferredTaxAssetOTTI100.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:DeferredTaxAssetOperatingLeaseLiability

idcc:DeferredTaxAssetOperatingLeaseLiability


Deferred
Period End2020-12-312019-12-31
Value5382000.05760000.0
Percentage of DeferredTaxAssetOperatingLeaseLiability100.0100.0

idcc:DeferredTaxAssetsForeignTaxWithholding

idcc:DeferredTaxAssetsForeignTaxWithholding


Deferred
Period End2020-12-312019-12-312018-12-31
Value400000.0100000.01500000.0
Percentage of DeferredTaxAssetsForeignTaxWithholding100.0100.0100.0

idcc:DeferredTaxAssetsLiabilitiesOtherNet

idcc:DeferredTaxAssetsLiabilitiesOtherNet


Deferred
Period End2020-12-312019-12-31
Value-673000.0785000.0
Percentage of DeferredTaxAssetsLiabilitiesOtherNet100.0100.0

idcc:ErrorCorrectionAdjustmentTaxReceivablesAsAPercentOfTotalAssets

idcc:ErrorCorrectionAdjustmentTaxReceivablesAsAPercentOfTotalAssets


Error
Period End2021-06-30
Value1.5
Percentage of ErrorCorrectionAdjustmentTaxReceivablesAsAPercentOfTotalAssets100.0

idcc:FiniteLivedPatentsNet

idcc:FiniteLivedPatentsNet


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value381407418437447425436448438446454462316321325310301306310279274278277278259262265268271206206192191177145153140137135134130
Percentage of FiniteLivedPatentsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:FiniteLivedPatentsNet us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value17353538383839
Percentage of FiniteLivedPatentsNet4.68.68.48.78.59.09.0

idcc:FiniteLivedPatentsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:Patents


Finite
Period End2020-12-312019-12-312018-12-31
Value418436454
Percentage of FiniteLivedPatentsNet100.0100.0100.0

idcc:LossContingencyNumberOfPatentsAllegedInfringement us-gaap:LitigationCase, us-gaap:LitigationStatus, us-gaap:SubsequentEventType

idcc:LossContingencyNumberOfPatentsAllegedInfringement

idcc:DistrictOfDelawareProceedings, us-gaap:PendingLitigation, us-gaap:SubsequentEvent


Loss
Period End2020-07-14
Value8.0
Percentage of LossContingencyNumberOfPatentsAllegedInfringement100.0

idcc:IndiaProceedings, us-gaap:PendingLitigation, us-gaap:SubsequentEvent


Loss
Period End2020-07-29
Value2.0
Percentage of LossContingencyNumberOfPatentsAllegedInfringement0.0

idcc:MinimumExercisePricePerCommonShareOptions

idcc:MinimumExercisePricePerCommonShareOptions


Minimum
Period End2020-12-31
Value100.0
Percentage of MinimumExercisePricePerCommonShareOptions100.0

idcc:OperatingLeaseLiabilityExcludingPrepaidReceivable

idcc:OperatingLeaseLiabilityExcludingPrepaidReceivable


Operating
Period End2020-12-31
Value25
Percentage of OperatingLeaseLiabilityExcludingPrepaidReceivable100.0

idcc:OperatingLeaseReceivable

idcc:OperatingLeaseReceivable


Operating
Period End2020-12-31
Value817000.0
Percentage of OperatingLeaseReceivable100.0

idcc:OperatingLeaseReceivable us-gaap:Restatement

srt:ScenarioPreviouslyReported


Operating
Period End2020-12-31
Value817000.0
Percentage of OperatingLeaseReceivable100.0

idcc:ProceedsFromStockOptionsIfExercised

idcc:ProceedsFromStockOptionsIfExercised


Proceeds
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value167.61121198.28.41.72.84.99.4
Percentage of ProceedsFromStockOptionsIfExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

idcc:ReceivableFromSaleOfLongTermInvestmentsCurrent

idcc:ReceivableFromSaleOfLongTermInvestmentsCurrent


Receivable
Period End2021-06-30
Value3016000.0
Percentage of ReceivableFromSaleOfLongTermInvestmentsCurrent100.0

idcc:UnsettledRepurchaseOfCommonStock

idcc:UnsettledRepurchaseOfCommonStock


Unsettled
Period End2021-03-31
Value1994000.0
Percentage of UnsettledRepurchaseOfCommonStock100.0

us-gaap:AccountsPayableCurrentAndNoncurrent

us-gaap:AccountsPayableCurrentAndNoncurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7.0438.592101211121312142219179.3931310111117141219181914129.3193431329.66624139.2699.6167.3674.2747.115.4965.3267.572
Percentage of AccountsPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsReceivableNet

us-gaap:AccountsReceivableNet


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312018-01-312018-01-012017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value12121628192528235733352977666120321640039940222814610411453116108103511343466992605116936383128292933
Percentage of AccountsReceivableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsReceivableNet us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Accounts
Period End2020-12-312019-12-31
Value2.31.7
Percentage of AccountsReceivableNet14.46.0

us-gaap:AllowanceForDoubtfulAccountsReceivable

us-gaap:AllowanceForDoubtfulAccountsReceivable


Allowance
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-06-302009-12-31
Value322000.0000537000.0537000.0537000.0537000.0537000.0693000.0456000.0456000.0456000.0456000.0456000.0456000.00000001654000.01654000.01654000.01654000.01750000.01750000.01750000.01750000.01750000.01750000.01750000.01750000.01750000.01750000.01750000.01750000.01750000.01750000.01500000.0
Percentage of AllowanceForDoubtfulAccountsReceivable100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure

us-gaap:AssetsFairValueDisclosure


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value83788993092484679493695784280695910741157
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value411386397742677519757746543516488415417
Percentage of AssetsFairValueDisclosure49.243.542.780.280.065.480.977.964.564.150.938.736.0

us-gaap:FairValueInputsLevel2


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value425502533182168275179211299289470658740
Percentage of AssetsFairValueDisclosure50.856.557.319.820.034.619.122.135.535.949.161.364.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax


Available
Period End2020-12-312019-12-312018-12-31
Value363000.0475000.05000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:FinancialInstrument

us-gaap:CommercialPaper


Available
Period End2020-12-312018-12-31
Value5000.00
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax1.40.0

us-gaap:CorporateBondSecurities


Available
Period End2020-12-312019-12-312018-12-31
Value314000.0226000.05000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax86.547.6100.0

us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Available
Period End2020-12-312019-12-312018-12-31
Value44000.0249000.00
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax12.152.40.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax


Available
Period End2020-12-312019-12-312018-12-31
Value28000.002565000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.00.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax us-gaap:FinancialInstrument

us-gaap:CommercialPaper


Available
Period End2020-12-312018-12-31
Value7000.00
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax25.00.0

us-gaap:CorporateBondSecurities


Available
Period End2020-12-312019-12-312018-12-31
Value5000.00984000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax17.90.038.4

us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Available
Period End2020-12-312019-12-312018-12-31
Value16000.001581000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax57.10.061.6

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis


Available
Period End2020-12-312019-12-312018-12-31
Value532178473
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:FinancialInstrument

us-gaap:CommercialPaper


Available
Period End2020-12-312018-12-31
Value28514
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis53.53.1

us-gaap:CorporateBondSecurities


Available
Period End2020-12-312019-12-312018-12-31
Value8173167
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis15.341.035.4

us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Available
Period End2020-12-312019-12-312018-12-31
Value166105291
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis31.259.061.5

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue


Available
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value517163390345404373151189207212285
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:AvailableForSaleSecuritiesDebtSecurities


Available
Period End2020-12-312019-12-312018-12-31
Value533179470
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:BalanceSheetLocation

us-gaap:CashAndCashEquivalents


Available
Period End2020-12-312019-12-312018-12-31
Value800.00.0
Percentage of AvailableForSaleSecuritiesDebtSecurities15.00.00.0

us-gaap:ShortTermInvestments


Available
Period End2020-12-312019-12-312018-12-31
Value453179470
Percentage of AvailableForSaleSecuritiesDebtSecurities85.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel2, idcc:CorporateBondsAndAssetBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312019-12-31
Value57728173
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.015.341.0

us-gaap:FairValueInputsLevel2, idcc:CorporateBondsAndAssetBackedSecuritiesDomain


Available
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value106891007398166
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.00.041.00.035.4

us-gaap:FairValueInputsLevel2, us-gaap:USTreasuryAndGovernment


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value119155166245386105113289
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.031.20.00.00.059.00.061.5

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FinancialInstrument

idcc:CorporateBondsAndAssetBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312019-12-31
Value57728173
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.015.341.0

idcc:CorporateBondsAndAssetBackedSecuritiesDomain


Available
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value106891007398166
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.00.041.00.035.4

us-gaap:CommercialPaper


Available
Period End2020-12-312018-12-31
Value28514
Percentage of AvailableForSaleSecuritiesDebtSecurities53.53.1

us-gaap:CorporateBondSecurities


Available
Period End2020-12-312019-12-312018-12-31
Value8173166
Percentage of AvailableForSaleSecuritiesDebtSecurities15.341.035.4

us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Available
Period End2020-12-312019-12-312018-12-31
Value166105289
Percentage of AvailableForSaleSecuritiesDebtSecurities31.259.061.5

us-gaap:USTreasuryAndGovernment


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value119155166245386105113289
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.031.20.00.00.059.00.061.5

us-gaap:BuildingsAndImprovementsGross

us-gaap:BuildingsAndImprovementsGross


Buildings
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value3.5483.7023.7113.6243.57611117.9027.87.7637.653
Percentage of BuildingsAndImprovementsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure

us-gaap:CashAndCashEquivalentsFairValueDisclosure


Cash
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value752677529757746543516488524
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:CashAndCashEquivalents

idcc:MoneyMarketFundsAndDemandDeposits


Cash
Period End2021-06-302021-03-312020-12-312019-12-31
Value411386397757
Percentage of CashAndCashEquivalentsFairValueDisclosure0.00.00.0100.0

us-gaap:CommercialPaper


Cash
Period End2021-06-302021-03-312020-12-31
Value248274285
Percentage of CashAndCashEquivalentsFairValueDisclosure0.00.00.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:CashAndCashEquivalents, us-gaap:FairValueByFairValueHierarchyLevel

idcc:MoneyMarketFundsAndDemandDeposits, us-gaap:FairValueInputsLevel1


Cash
Period End2021-06-302021-03-312020-12-312019-12-31
Value411386397757
Percentage of CashAndCashEquivalentsFairValueDisclosure0.00.00.0100.0

us-gaap:CommercialPaper, us-gaap:FairValueInputsLevel2


Cash
Period End2021-06-302021-03-312020-12-31
Value248274285
Percentage of CashAndCashEquivalentsFairValueDisclosure0.00.00.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel1, idcc:MoneyMarketFundsAndDemandDeposits


Cash
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value742677519757746488
Percentage of CashAndCashEquivalentsFairValueDisclosure98.7100.098.1100.0100.0100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FinancialInstrument

idcc:MoneyMarketFundsAndDemandDeposits


Cash
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value742677519757746488
Percentage of CashAndCashEquivalentsFairValueDisclosure98.7100.098.1100.0100.0100.0

us-gaap:CommercialPaper

us-gaap:CommercialPaper


Commercial
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value5126880.00.014109154100156030591761781491891208418183237144087488.0444.04612
Percentage of CommercialPaper100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommercialPaper us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2


Commercial
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value5126880.00.014
Percentage of CommercialPaper100.0100.0100.00.00.0100.0

us-gaap:CommercialPaper us-gaap:InvestmentType

us-gaap:CashAndCashEquivalents


Commercial
Period End2020-09-30
Value10.0
Percentage of CommercialPaper19.5

us-gaap:ContractWithCustomerAssetNetCurrent

us-gaap:ContractWithCustomerAssetNetCurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value8.39.49.7111012161419
Percentage of ContractWithCustomerAssetNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerAssetNetNoncurrent

us-gaap:ContractWithCustomerAssetNetNoncurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value8.88.98.99.49.59.5101.35.5
Percentage of ContractWithCustomerAssetNetNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiabilityNoncurrent

us-gaap:ContractWithCustomerLiabilityNoncurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value82112108108139104123107157
Percentage of ContractWithCustomerLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConvertibleDebt us-gaap:LongtermDebtType

us-gaap:ConvertibleDebt

us-gaap:ConvertibleDebt


Convertible
Period End2021-06-302021-03-312020-12-312019-12-31
Value394394343423
Percentage of ConvertibleDebt100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount

us-gaap:DebtInstrumentCarryingAmount


Debt
Period End2020-12-31
Value400
Percentage of DebtInstrumentCarryingAmount100.0

us-gaap:DebtInstrumentInterestRateEffectivePercentage us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentInterestRateEffectivePercentage

idcc:ConvertibleNotes2024, us-gaap:ConvertibleDebt


Debt
Period End2021-06-302021-03-312019-06-03
Value2.022.020.0625
Percentage of DebtInstrumentInterestRateEffectivePercentage100.0100.0100.0

us-gaap:DebtInstrumentUnamortizedDiscount us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentUnamortizedDiscount

idcc:AccountingStandardsUpdate202006, us-gaap:ConvertibleDebt


Debt
Period End2021-01-01
Value51
Percentage of DebtInstrumentUnamortizedDiscount100.0

us-gaap:AccountingStandardsUpdate202006, us-gaap:ConvertibleDebt


Debt
Period End2021-01-01
Value51
Percentage of DebtInstrumentUnamortizedDiscount100.0

us-gaap:DebtInstrumentUnamortizedDiscount us-gaap:DebtInstrument, us-gaap:LongtermDebtType

idcc:ConvertibleNotes2024, us-gaap:ConvertibleDebt


Debt
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value5458616467
Percentage of DebtInstrumentUnamortizedDiscount0.00.00.00.00.0

us-gaap:DebtInstrumentUnamortizedDiscount us-gaap:LongtermDebtType

us-gaap:ConvertibleDebt


Debt
Period End2020-12-312019-12-312019-09-302019-06-30
Value516569-73.622
Percentage of DebtInstrumentUnamortizedDiscount0.00.00.00.0

us-gaap:DebtInstrumentUnamortizedDiscount us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:ConvertibleDebt, us-gaap:SubsequentEvent


Debt
Period End2021-01-01
Value51
Percentage of DebtInstrumentUnamortizedDiscount100.0

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us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

idcc:ConvertibleNotes2020, us-gaap:ConvertibleDebt


Debt
Period End2020-12-31
Value3300000.0
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet100.0

us-gaap:DeferredFinanceCostsGross

us-gaap:DeferredFinanceCostsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value6400000.06400000.01621000.03011000.04401000.06117000.01629000.0
Percentage of DeferredFinanceCostsGross100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredFinanceCostsNet us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DeferredFinanceCostsNet

idcc:ConvertibleNotes2024, us-gaap:ConvertibleDebt


Deferred
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-03
Value4913000.05210000.05501000.05789000.06069000.01600000.0
Percentage of DeferredFinanceCostsNet100.0100.0100.0100.0100.0100.0

us-gaap:DeferredFinanceCostsNet us-gaap:LongtermDebtType

us-gaap:ConvertibleDebt


Deferred
Period End2021-06-302021-03-312020-12-312019-12-312019-09-30
Value5194000.05596000.04612000.05859000.06243000.0
Percentage of DeferredFinanceCostsNet0.00.00.0101.2102.9

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxAssetsNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value828280787973738577
Percentage of DeferredIncomeTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsDeferredIncome

us-gaap:DeferredTaxAssetsDeferredIncome


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value26333938921167312327981
Percentage of DeferredTaxAssetsDeferredIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-31
Value224207
Percentage of DeferredTaxAssetsGross100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value14013112612589827170687360
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-31
Value27110.0
Percentage of DeferredTaxAssetsTaxCreditCarryforwards100.0100.00.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value5857000.07520000.06405000.04098000.02799000.02029000.09452000.05014000.04831000.01097000.01050000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value4.0823.3075.0378.936149.599128.6947.66129.322
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill


Deferred
Period End2020-12-312019-12-312018-12-31
Value2211000.01933000.00
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill100.0100.00.0

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

us-gaap:DeferredTaxLiabilitiesLeasingArrangements


Deferred
Period End2020-12-312019-12-31
Value4684000.04913000.0
Percentage of DeferredTaxLiabilitiesLeasingArrangements100.0100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease


Defined
Period End2020-12-312019-12-31
Value0.443.0
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:BusinessAcquisition

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

idcc:TechnicolorPatentAndRIAcquisition


Defined
Period End2020-12-31
Value2699000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:BusinessAcquisition

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

idcc:TechnicolorPatentAndRIAcquisition


Defined
Period End2020-12-31
Value229000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive us-gaap:BusinessAcquisition

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

idcc:TechnicolorPatentAndRIAcquisition


Defined
Period End2020-12-31
Value540000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:BusinessAcquisition

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

idcc:TechnicolorPatentAndRIAcquisition


Defined
Period End2020-12-31
Value297000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:BusinessAcquisition

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

idcc:TechnicolorPatentAndRIAcquisition


Defined
Period End2020-12-31
Value547000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:BusinessAcquisition

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

idcc:TechnicolorPatentAndRIAcquisition


Defined
Period End2020-12-31
Value381000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsAccumulatedBenefitObligation us-gaap:BusinessAcquisition

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsAccumulatedBenefitObligation

idcc:ResearchInnovationUnitTechnicolorSA


Defined
Period End2020-12-312019-12-31
Value7600000.06200000.0
Percentage of DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsAccumulatedBenefitObligation100.0100.0

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation us-gaap:BusinessAcquisition

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation

idcc:TechnicolorPatentAcquisition


Defined
Period End2020-09-302019-12-31
Value7000000.06200000.0
Percentage of DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation100.0100.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsCurrent

us-gaap:DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsCurrent


Disposal
Period End2021-06-30
Value6228000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsCurrent100.0

us-gaap:DividendsPayableCurrentAndNoncurrent

us-gaap:DividendsPayableCurrentAndNoncurrent


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value10101010101010101011111112121212101010106.8616.9237.0687.1837.2437.2327.4567.6668.0333.9544.0314.1194.1184.1150.04.0954.3484.4694.574.5494.544.5260.0
Percentage of DividendsPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3021322724182926251526191612241815112215149.953261713122725189.934158.9937.8322020171114119.2316.5652210
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

idcc:RestrictedStockUnitsRSUsAndRestrictedStock


Employee
Period End2020-12-31
Value8.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0

us-gaap:EmployeeStockOption


Employee
Period End2020-12-31
Value0.5
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized6.2

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:Patents


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value52746939733528223318915212210888
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:Patents


Finite
Period End2020-12-312018-12-312017-12-312016-12-31
Value74705352
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:Patents


Finite
Period End2020-12-312018-12-312017-12-312016-12-31
Value51513834
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:Patents


Finite
Period End2020-12-312018-12-312017-12-312016-12-31
Value55574139
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:Patents


Finite
Period End2020-12-312018-12-312017-12-312016-12-31
Value63614543
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:Patents


Finite
Period End2020-12-312018-12-312017-12-312016-12-31
Value69655046
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsFairValueDisclosure us-gaap:MajorCustomers, us-gaap:FairValueByAssetClass

us-gaap:FiniteLivedIntangibleAssetsFairValueDisclosure

idcc:ZTECorporation, us-gaap:Patents


Finite
Period End2020-12-312019-12-31
Value1914
Percentage of FiniteLivedIntangibleAssetsFairValueDisclosure100.0100.0

us-gaap:FiniteLivedPatentsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedPatentsGross

us-gaap:Patents


Finite
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value945905851660593511455358300245218
Percentage of FiniteLivedPatentsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxReceivable

us-gaap:IncomeTaxReceivable


Income
Period End2021-06-302020-12-31
Value2724
Percentage of IncomeTaxReceivable100.0100.0

us-gaap:IncomeTaxesReceivable

us-gaap:IncomeTaxesReceivable


Income
Period End2021-06-302021-03-312020-12-312019-12-31
Value46706938
Percentage of IncomeTaxesReceivable100.0100.0100.0100.0

us-gaap:IncomeTaxesReceivable us-gaap:Restatement

srt:ScenarioPreviouslyReported


Income
Period End2020-12-31
Value69
Percentage of IncomeTaxesReceivable100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-31
Value3741000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0

us-gaap:LongTermDebtFairValue us-gaap:BusinessAcquisition

us-gaap:LongTermDebtFairValue

idcc:TechnicolorPatentAcquisition


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value33262726262423
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtFairValue us-gaap:LongtermDebtType

us-gaap:ConvertibleDebt


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value442422418411396366492488331
Percentage of LongTermDebtFairValue1333.31576.91550.01561.01510.01511.72115.30.00.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour


Long
Period End2020-12-31
Value400
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2020-12-31
Value5.6
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwards

us-gaap:StateAndLocalJurisdiction


Operating
Period End2020-12-31
Value1600
Percentage of OperatingLossCarryforwards100.0

us-gaap:OtherAccruedLiabilitiesCurrentAndNoncurrent

us-gaap:OtherAccruedLiabilitiesCurrentAndNoncurrent


Other
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value191617111917118.3831212117.4318.5458.2597.9088.2238.356101213121813111314211521293210138.8389.8128.6988.6344.762
Percentage of OtherAccruedLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherAssetsMiscellaneousNoncurrent

us-gaap:OtherAssetsMiscellaneousNoncurrent


Other
Period End2021-06-302020-12-31
Value1213
Percentage of OtherAssetsMiscellaneousNoncurrent100.0100.0

us-gaap:OtherAssetsMiscellaneousNoncurrent us-gaap:Restatement

srt:ScenarioPreviouslyReported


Other
Period End2020-12-31
Value13
Percentage of OtherAssetsMiscellaneousNoncurrent100.0

us-gaap:OtherLongTermInvestments

us-gaap:OtherLongTermInvestments


Other
Period End2021-06-302020-12-31
Value1415
Percentage of OtherLongTermInvestments100.0100.0

us-gaap:OtherLongTermInvestments us-gaap:Restatement

srt:ScenarioPreviouslyReported


Other
Period End2020-12-31
Value15
Percentage of OtherLongTermInvestments100.0

us-gaap:PrepaidExpenseCurrent

us-gaap:PrepaidExpenseCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312019-12-31
Value7.417121016
Percentage of PrepaidExpenseCurrent100.0100.0100.0100.0

us-gaap:PrepaidExpenseCurrent us-gaap:Restatement

srt:ScenarioPreviouslyReported


Prepaid
Period End2020-12-31
Value10
Percentage of PrepaidExpenseCurrent100.0

us-gaap:PurchaseObligationDueInNextTwelveMonths

us-gaap:PurchaseObligationDueInNextTwelveMonths


Purchase
Period End2020-12-31
Value16
Percentage of PurchaseObligationDueInNextTwelveMonths100.0

us-gaap:RestrictedCash

us-gaap:RestrictedCash


Restricted
Period End2020-12-312019-12-312019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302016-12-31
Value3.19.5111313150.00.00.0
Percentage of RestrictedCash100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:RestrictedCashCurrent

us-gaap:RestrictedCashCurrent


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.7413.6883.1084.4015.90612109.22911131315
Percentage of RestrictedCashCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCashNoncurrent

us-gaap:RestrictedCashNoncurrent


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1081000.01081000.01081000.01081000.01081000.01081000.01081000.01080000.00000
Percentage of RestrictedCashNoncurrent100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:RestructuringReserve

us-gaap:RestructuringReserve


Restructuring
Period End2021-06-302014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-31
Value110.00.00.00.00.02.211
Percentage of RestructuringReserve100.00.00.00.00.00.0100.0100.0

us-gaap:RevenueRemainingPerformanceObligation

us-gaap:RevenueRemainingPerformanceObligation


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value142207273771521942606312818975860118173
Percentage of RevenueRemainingPerformanceObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SeniorNotes us-gaap:BusinessAcquisition

us-gaap:SeniorNotes

idcc:TechnicolorPatentAcquisition


Senior
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value25242423222121
Percentage of SeniorNotes100.0100.0100.0100.0100.0100.0100.0

us-gaap:SeniorNotes us-gaap:DebtInstrument, us-gaap:LongtermDebtType

idcc:ConvertibleNotes2024, us-gaap:ConvertibleDebt


Senior
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value340336332329326
Percentage of SeniorNotes1456.21490.71525.71561.50.0

us-gaap:SeniorNotes us-gaap:LongtermDebtType

us-gaap:ConvertibleDebt


Senior
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value394394343340336332423419494316316316316316316316316316316316316316546546546546230230230230230230230230230230230230230230230
Percentage of SeniorNotes1530.71578.11422.51456.21490.71525.72007.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value1265000.0955000.0915000.01005000.01398000.01729000.01902000.0655000.0253000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice


Share
Period End2020-12-31
Value39.84
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue


Share
Period End2020-12-31
Value11
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue


Share
Period End2020-12-31
Value8400000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber


Share
Period End2020-12-31
Value300000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber100.0

us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions

us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions


Share
Period End2020-12-312019-12-312018-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value500000.0300000.0300000.0500000.0300000.0300000.0300000.0200000.0300000.0700000.0
Percentage of ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue


Sharebased
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value53.5362.463.757.9546.6537.6535.7342.04
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1


Stock
Period End2020-12-31
Value71
Percentage of StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1100.0

us-gaap:StockholdersEquityBeforeTreasuryStock

us-gaap:StockholdersEquityBeforeTreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2094209721522162214921322140213621432104211021162102209719271884185718111804167115721535151014791458143013721362135312741279126412361228124012881055104710401017990922
Percentage of StockholdersEquityBeforeTreasuryStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TaxesPayableCurrentAndNoncurrent

us-gaap:TaxesPayableCurrentAndNoncurrent


Taxes
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312018-01-312018-01-012017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value0.360.1210.1020.2250.0510.1930.6370.0071.508980.6910.256-6.2261314393939101511131.4051414110.011442.5817.0561.5021.2383.961334.5664.4323.2653.763.7863.675
Percentage of TaxesPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockCommonShares

us-gaap:TreasuryStockCommonShares


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value4040404040404040403937363636323636363236353532
Percentage of TreasuryStockCommonShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnamortizedDebtIssuanceExpense

us-gaap:UnamortizedDebtIssuanceExpense


Unamortized
Period End2020-12-312019-12-312018-12-312017-12-31
Value4600000.05900000.01600000.03000000.0
Percentage of UnamortizedDebtIssuanceExpense100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued


Unrecognized
Period End2020-12-312019-12-312018-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value100000.0100000.0100000.0100000.0100000.0100000.0000300000.0
Percentage of UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued100.0100.0100.0100.0100.0100.00.00.00.0100.0

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value3.84.54.3523.252101.4691.361
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate100.0100.0100.0100.0100.0100.0100.0

us-gaap:ValuationAllowancesAndReservesBalance us-gaap:ValuationAllowancesAndReservesType

us-gaap:ValuationAllowancesAndReservesBalance

us-gaap:ValuationAllowanceOfDeferredTaxAssets


Valuation
Period End2020-12-312019-12-312018-12-312017-12-31
Value144133125123
Percentage of ValuationAllowancesAndReservesBalance100.0100.0100.0100.0

Line plots across dimensions of each concept


us-gaap:SharesOutstanding
us-gaap:StatementEquityComponents
(None,)
Shares Outstandingus-gaap: Statement Equity Components
us-gaap:SharesIssued
us-gaap:StatementEquityComponents
(None,)
Shares Issuedus-gaap: Statement Equity Components
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
(None,)
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amountus-gaap: Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities
TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:InterestExpenseDebt
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
(None, 'us-gaap:ConvertibleDebt')
Interest Expense Debtus-gaap: Debt Instrument, us-gaap: Longterm Debt Type
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
dei:LegalEntity
(None,)
Net Income Loss Attributable To Noncontrolling Interestdei: Legal Entity
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ContractWithCustomerBasisOfPricing
(None,)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Contract With Customer Basis Of Pricing
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService, us-gaap:ContractWithCustomerDuration
('idcc:PatentLicensingRoyalties', None)
Revenue From Contract With Customer Excluding Assessed Taxus-gaap: Product Or Service, us-gaap: Contract With Customer Duration
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:FinancialInstrument
(None,)
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalentsus-gaap: Financial Instrument
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents
(None,)
Stockholders Equity Including Portion Attributable To Noncontrolling Interestus-gaap: Statement Equity Components
us-gaap:AmortizationOfFinancingCosts
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
(None, 'us-gaap:ConvertibleDebt')
Amortization Of Financing Costsus-gaap: Debt Instrument, us-gaap: Longterm Debt Type
us-gaap:Dividends
us-gaap:StatementEquityComponents
(None,)
Dividendsus-gaap: Statement Equity Components