IOVA


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

Table of contents



us-gaap:CommonStockValue
us-gaap:StatementClassOfStock
us-gaap:SharesOutstanding
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType
us-gaap:PlanName

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:GeneralAndAdministrativeExpense

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:OperatingExpenses

us-gaap:OperatingIncomeLoss

us-gaap:ResearchAndDevelopmentExpense
dei:LegalEntity
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ShortTermInvestments
us-gaap:FinancialInstrument

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:LongTermInvestments

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:LiabilitiesCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:LiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
us-gaap:LeaseContractualTerm

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree
us-gaap:LeaseContractualTerm

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour
us-gaap:LeaseContractualTerm

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive
us-gaap:LeaseContractualTerm

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
us-gaap:LeaseContractualTerm

us-gaap:OperatingLeaseLiability
us-gaap:LeaseContractualTerm

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue
us-gaap:LeaseContractualTerm
us-gaap:LeaseContractualTerm, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType
us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
us-gaap:LeaseContractualTerm

us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:Range, us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock, us-gaap:TypeOfArrangement
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation
us-gaap:RelatedPartyTransaction

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
us-gaap:OptionIndexedToIssuersEquityType
us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

iova:AcquisitionsOfPropertyAndEquipmentIncludedInAccountsPayableAndAccruedExpense
us-gaap:StatementClassOfStock
iova:CommonStockIssuedFromPreferredStockConversion
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock
iova:ConvertiblePricePerShares

iova:IncreaseDecreaseInOperatingLeaseLiabilities

iova:IncreaseDecreaseInOperatingLeaseRightOfUseAsset

iova:IncreaseDecreaseInOperatingLeaseRightOfUseAssets

iova:IncreaseDecreaseInRightOfUseAssetsFromLeaseModifications
us-gaap:Range, us-gaap:DebtInstrument, us-gaap:SubsequentEventType
iova:MinimumAverageSalary

iova:NonCashLeaseExpense
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
iova:PaymentsForUpfrontLicensingFee
us-gaap:Range, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement
iova:PercentageOfCommissionOnGrossSaleProceeds
us-gaap:SubsidiarySaleOfStock
iova:SalesAgreementCommissionMaximumPercentageOfGrossSalesProceeds

iova:Shortterminvestmentsforsale
us-gaap:DebtInstrument
iova:ThresholdAverageSalaryOfFullTimeEmployeesForLoanForgiveness

iova:UnrealizedGainLossOnShortTermInvestments
us-gaap:SubsidiarySaleOfStock
iova:WeightedAveragePricePerShare

us-gaap:AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
us-gaap:StatementEquityComponents

us-gaap:AmortizationOfDebtDiscountPremium

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect

us-gaap:ConversionOfStockAmountConverted1

us-gaap:Depreciation

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:InvestmentIncomeInterest

us-gaap:LeaseCost

us-gaap:OperatingLeaseCost
us-gaap:StatementGeographical
us-gaap:OperatingLeaseExpense

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
us-gaap:StatementEquityComponents

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromIssuanceOfCommonStock
us-gaap:SubsidiarySaleOfStock

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
us-gaap:Range

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
us-gaap:Range

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
us-gaap:OptionIndexedToIssuersEquityType

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
us-gaap:AwardType
us-gaap:IncomeStatementLocation

us-gaap:ShortTermLeaseCost

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
us-gaap:StatementEquityComponents

us-gaap:VariableLeaseCost

dei:EntityCommonStockSharesOutstanding

iova:AshCashEquivalentsAndShortTermInvestmentsAndRestrictedCashTotal

iova:AvailableForSaleDebtSecuritiesMaturityRollingAfterOneThroughTwoYearsAmortizedCost

iova:AvailableForSaleDebtSecuritiesMaturityRollingAfterOneThroughTwoYearsFairValue

iova:AvailableForSaleSecuritiesAccumulatedAccretion
us-gaap:FinancialInstrument

iova:CashEquivalentsAndInvestments

iova:ClinicalRelatedExpensesCurrent

iova:CommercialManufacturingFacilityRelatedCurrent
us-gaap:DebtInstrument
iova:DebtInstrumentAmountThatWillBeForgivenByLenderPerFullTimeOrFullTimeEquivalentEmployee
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
iova:DebtInstrumentLoanForgivenPerFullTimeEmployeeAmount

iova:DeferredTaxAssetsDepreciationAndAmortization

iova:DeferredTaxAssetsLeaseLiabilities

iova:DeferredTaxLiabilitiesDepreciationAndAmortization

iova:LegalAndRelatedServicesCurrent

iova:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour
us-gaap:LeaseContractualTerm
us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm, us-gaap:PropertyPlantAndEquipmentByType
iova:LesseeOperatingLeaseLiabilityToBePaidExcludingOneTimeOptionToExtendLeasePayments

iova:ManufacturingRelatedExpensesCurrent

iova:OperatingLossCarryForwardsHavingDefiniteExpireLifeValue

iova:OperatingLossCarryForwardsHavingIndefiniteExpireLifeValue
us-gaap:SubsidiarySaleOfStock
iova:SalesAgreementAuthorizedSharesToBeIssuedAmount

iova:SecurityDepositForBenefitOfUtilitiesServiceProvider

us-gaap:AccruedEmployeeBenefitsCurrent
us-gaap:StatementGeographical
us-gaap:AreaOfLand
us-gaap:SubsequentEventType

us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent

us-gaap:CashCashEquivalentsAndShortTermInvestments

us-gaap:CashEquivalentsAtCarryingValue
us-gaap:CashAndCashEquivalents
us-gaap:DebtInstrument
us-gaap:DebtInstrumentFaceAmount
us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
us-gaap:PlanName
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
us-gaap:LeaseContractualTerm

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
us-gaap:LeaseContractualTerm

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards
us-gaap:StatementClassOfStock
us-gaap:PreferredStockLiquidationPreferenceValue
us-gaap:StatementClassOfStock
us-gaap:PreferredStockValue
us-gaap:AdjustmentsForNewAccountingPronouncements
us-gaap:PrepaidExpenseAndOtherAssets

us-gaap:RestrictedCash

us-gaap:SecurityDeposit
us-gaap:Range
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
us-gaap:OptionIndexedToIssuersEquityType
us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
us-gaap:OptionIndexedToIssuersEquityType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
us-gaap:OptionIndexedToIssuersEquityType
us-gaap:AwardType
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
us-gaap:Range, us-gaap:SubsidiarySaleOfStock
us-gaap:SharesIssuedPricePerShare

Plots across concepts


Balance Sheet
Liabilities Noncurrent
Assets
Operating Lease Right Of Use Asset
Current Assets
Prepaid Expense And Other Assets Current
NonCurrent Assets
Other Assets Noncurrent
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Liabilities Noncurrent
Current Liabilities
Other Accrued Liabilities Current
Stockholders Equity
Retained Earnings Accumulated Deficit
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Net Income Loss
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Proceeds From Issuance Of Long Term Debt
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
us-gaap:CommonStockValue █▇▇▇▇▆▆▆▆▆▆▅▅▄▄▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▁▄▄▄▄▄▄▄▄0.0070.0060.0060.0060.0060.0050.0050.0050.0050.0050.0050.0040.0040.0030.0030.0030.0030.0030.0030.0030.0030.0020.0020.0020.0019640.001870.0014070.0011520.0011350.0009210.0008350.0006290.0005563.4e-050.0034120.0032620.0032620.0032620.003250.0032910.0032360.003068
 us-gaap:SharesOutstanding us-gaap:StatementClassOfStock us-gaap:SeriesAPreferredStockNANA0.000194NA0.0001940.0001940.0001940.0001940.0001940.0001940.0001940.0001940.0001940.0016940.001694NANANA0.0016940.0016940.001694NA0.001694NANANA0.005694NANANA0.017NANANANANANANANANANANA
 us-gaap:SharesOutstanding us-gaap:StatementClassOfStock us-gaap:SeriesBPreferredStockNANA3.581119NA3.5811193.5811193.5811193.5811195.8548455.8548455.8548455.8548456.1276927.3782417.378241NANANA7.9466737.94667311.368633NA0.0NANANA0.0NANANA0.0NANANANANANANANANANANA
 us-gaap:SharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStockNANA146.874917NA146.43481126.823156126.411808126.19299123.820508123.395113123.41557697.42572192.74167289.60541773.164914NANANA62.24807461.94838958.38890548.51652848.5477247.80739847.14019544.87188833.750188NANANA20.023958NANANA0.818806NANANANANANANA
us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▇▇▁▇▆▅▁▄▄▃0.1537510.147370.1467380.1464920.1331620.1265680.1262730.1240350.1235670.1234150.1190850.0950770.0902360.084350.0727940.0633320.0624570.0622860.0621359.11351.08151948.5475340.04791247.27159345.08217637.6786620.02827126.63290824.13778220.798229NA14.1520526.2413270.818806NA78.2930950.7829310.781367NA78.299552NANA
us-gaap:EarningsPerShareBasic -0.53NANANA-0.47NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareDiluted -0.53NANANA-0.47NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareBasicAndDiluted NA-0.51-0.47-0.4-0.47-0.55-0.5-0.4-0.38-0.3-0.27-0.36-0.34-0.31-0.36-0.35-0.37-0.33-0.25-1.15-0.23-0.14-0.18-0.16-0.14-0.14-0.17-0.11-0.09-0.11-1.5000000000000002-0.66-0.011.280.049999999999999996-0.01-0.00.07-0.11000000000000001-0.07-0.15-0.01
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
us-gaap:AllocatedShareBasedCompensationExpense NANANA0.0NANANA0.1NANANA0.1NANANANANA0.0NANA4.51.5NANA1.31.017308NANA0.4389510.90165NANANANANANANANANANANANA
 us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType us-gaap:EmployeeStockOptionNA16.7NA10.710.59.35.36.56.45.85.25.45.2NANANANANANANANANANANANANA0.658512NANANANANANANANANANANANANANANA
 us-gaap:AllocatedShareBasedCompensationExpense us-gaap:PlanName iova:TwoThousandTwentyEspp█▁0.50.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▁▂▂▃▃▂▃▄▄▅▅▅▅▆▆▆▆▆▇▇▇█▇██████-81.414-75.372-68.533-58.733-63.613-68.903-63.587-49.62-47.317-36.77-32.497-33.947-30.663-26.515-25.854-22.149-23.379-20.711-15.822-18.673-11.553-6.864-8.367-7.597-6.345786-5.298-4.867-2.798-2.110169NANANANANANANANANANANANANA
us-gaap:GeneralAndAdministrativeExpense ██▇▆▆▆▄▄▄▄▃▃▃▃▃▂▂▂▂▄▃▁▂▁▁▁19.30719.62116.08315.91614.35313.85810.87210.02910.8679.0817.5257.1136.8276.9658.4854.593.9284.2595.08510.4987.2642.8184.4222.6832.3852.9NANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▁▁▂▃▃▂▂▄▄▅▅▅▅▆▆▆▆▆▆▆▇▇▇▇▇▇▇▇██▇▇▇████▇▇▇▇█-81.351-75.449-68.397-58.571-63.018-69.595-63.568-49.487-47.551-36.95-32.575-33.83-30.66-26.515-25.854-22.149-23.377-20.684-15.689-18.758-11.563-6.884-8.36-7.635-6.36749-5.298059-4.651-2.79831-2.110169-2.259514-11.496516-9.409063-3.429255-1.0465293.466241-0.673896-0.327284-5.772679-8.351586-5.818478-10.959741-0.741922
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁▂▃▄▃▃▃▅▅▇▇▇▇█-81.351-75.449-68.397-58.571-63.018-69.595-63.568-49.487-47.551-36.95-32.575-33.83-30.66-26.515NANANANA-15.688-18.759-11.563-6.884-8.377-7.61745-6.367491-5.298059NANANANANANANA-1.0465293.466241-0.673897-0.327284-5.772679-8.351586-5.818478NANA
us-gaap:OperatingExpenses █▇▇▆▆▇▇▅▅▄▄▄▄▃▃▃▃▃▂▃▂▂▂▂▂▁▁▁▁▁▂▂▁▁▁▁▁▁▁▁▂▁81.42675.5768.53458.96663.62770.8165.1151.61150.16539.98634.94335.0631.37826.87726.07122.34323.58120.88215.92218.97911.7277.018.4547.6436.4402255.2980594.8681852.80252.1101692.25951411.497539.4090631.029260.7049131.7227061.6276361.6464253.1361334.1847435.81414110.5611850.496077
us-gaap:OperatingIncomeLoss ▁▂▂▃▃▂▂▄▄▅▅▅▅▆▆▆▆▆▇▆▇▇▇▇▇█████▇▇████████▇█-81.426-75.57-68.534-58.966-63.627-70.81-65.11-51.611-50.165-39.986-34.943-35.06-31.378-26.877-26.071-22.343-23.581-20.882-15.922-18.979-11.727-7.01-8.454-7.643-6.440225-5.298-4.868185-2.8025-2.110169-2.259514-11.49753-9.409063-1.02926-0.704913-1.722706-1.627636-1.646425-3.136133-4.184743-5.814141-10.561185-0.496077
us-gaap:ResearchAndDevelopmentExpense █▇▇▆▇▇▇▆▅▄▄▄▄▃▃▃▃▃▂▂▂▁▁▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁62.11955.94952.45143.0549.27456.95254.23841.58239.29830.90527.41827.94724.55119.91217.58617.75319.65316.62310.8378.4814.4634.1923.3234.9834.0556882.0110331.6868290.3538790.3612270.3026620.5593670.250.250.270.250.250.270.8861.7555610.0NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
us-gaap:Assets █▇▇▇█▃▄▄▅▅▅▃▃▄▂▂▂▂▂▂▃▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁852.79750.573768.458782.294817.567288.298344.655395.746435.924461.502480.821270.834284.751307.248155.373173.97138.012155.389171.886182.325193.542100.768105.653112.224114.739592113.53758646.50684717.41687618.53534218.08259619.8736490.1686260.5977490.0283330.0294130.0286920.0656110.0768470.568433.4385960.4661661.460952
us-gaap:Liabilities █▇█▅▄▃▃▃▃▂▁108.377103.142111.9670.45359.25844.98545.68440.68338.50226.5714.628NANANA9.892NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesAndStockholdersEquity █▇▇▇█▃▄▄▅▅▅▃▃▄▂▂▂▂▂▂▃▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁852.79750.573768.458782.294817.567288.298344.655395.746435.924461.502480.821270.834284.751307.248155.373173.97138.012155.389171.886182.325193.542100.768105.653112.224114.739592113.53758646.50684717.41687618.53534218.08259619.8736490.1686260.5977490.0283330.0294130.0286920.0656110.0768470.568433.4385960.4661661.460952
us-gaap:StockholdersEquity █▇▇██▃▄▄▅▅▅▃▄▄▂▃▂▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁744.413647.431656.498711.841758.309243.313298.971355.063397.422434.932466.193254.16270.569292.558145.481165.441129.152149.886166.918179.131188.93698.938104.023109.369112.873396111.62686944.84508716.15818717.3788716.80605317.603717-3.340459-2.771322-12.278619-11.319476-16.581601-16.618362-17.258451-12.780918-5.690725-1.4039450.638085
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
us-gaap:AssetsCurrent ▇▆▇▇█▃▄▄▅▅▅▃▄▄▂▃▂▂▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁666.64605.218636.1723.59782.654256.381316.493367.307410.938444.753475.374265.863279.781302.726149.29171.375135.434152.593169.512180.556192.3599.359103.977110.391112.714536111.40932644.97528117.23081218.51957118.06796819.8458930.1386820.5787160.008150.0072750.0050.0243670.034050.5240813.2981080.3260651.300916
us-gaap:CashAndCashEquivalentsAtCarryingValue ▃▄▃▃▅▂▁▂▃▂▃▃▇█▄▅▄▄▄▃▃▁▁▁▁▄▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁82.763131.95467.32968.31160.61452.5413.96938.88976.91254.09382.15280.738246.017297.082145.373163.38114.285107.099106.71792.895101.2228.94313.64210.2112.55629111.28044344.90914717.18967118.44036117.94387719.6721770.1298040.569580.00.00.00.0157390.00.5102170.9106080.2685651.292469
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▃▅▃▃▆▂▁▂▃▂▃▃█88.847138.03872.85473.835166.13958.06519.41944.33982.36254.09382.15280.738246.017NA145.373NANANA106.717NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ShortTermInvestments ▇▅▇█▇▁▃573.605472.203562.108645.838611.265193.112293.112NANANA386.371NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▇█▅▇██▇▄▅▄▅▅▃▄▃▆▅▄▃▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁10.27211.2886.6639.44210.77510.7299.4125.4336.7854.7356.8515.8633.6825.6443.9177.9956.4175.3963.0421.2740.7820.1930.2770.2450.3784090.1288830.0661340.0150740.0097440.010.0150.0050.0050.0050.0050.0050.0086280.034050.013864NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
us-gaap:PropertyPlantAndEquipmentGross █▆▁86.43678.764.737NANANA13.034NANANA6.643NANANA5.4835.3865.1235.0984.455NANANA2.7792.627NANA1.635789NANANA0.043758NANANANANANANANANANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment █▅▁6.3165.955.578NANANA4.498NANANA3.96NANANA3.0332.7912.5452.3022.081NA0.0016431.3721.1030.7940.5298660.2896720.1042230.0387820.033730.0325670.0160020.0138140.012020.010870.0089150.0073610.0058090.0042570.0027040.0015130.0005950.0
us-gaap:PropertyPlantAndEquipmentNet █▇▆▄▃▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁80.1272.7559.15939.11218.72613.6078.5365.8564.4723.5042.6832.642.7062.2472.452.5952.5782.7962.3741.7691.1921.4091.6761.8332.0250562.128261.5315660.170990.0157710.0146280.0277560.0299440.0190330.0201830.0221380.0236920.0252440.0267970.0283490.0188030.0162990.0
us-gaap:LongTermInvestments █▁46.28810.227NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset ███▂▂▂▂▃▂▂▁52.50855.13154.75610.6827.489.30510.69513.73811.7199.9570.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▁▁█▂▂▂▂▂▂▂▂▂▂▂▂1.151.16312.9183.3853.1823.483.4813.3953.3453.2882.7642.3312.2642.2753.633NANANA0.0NANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
us-gaap:AccountsPayableCurrent ▇▅▅█▄▄▅▄▅▃▂▃▂▃▁▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁21.91413.36913.51324.79410.23810.61415.5679.92112.7827.5892.7396.0145.1966.5761.2322.9053.6952.1740.8630.2280.7251.0540.9581.1611.1569221.107371.2484130.5738010.440550.2863250.4129761.5508651.4808511.2917181.0982710.8416160.6092660.5042520.1900480.2068640.1306380.030292
us-gaap:AccruedLiabilitiesCurrent ▇▇▇▇█▅▄▄▃▂▃▃▃▂▃▂▂▂▂▁▂▁▁▁▁▁▁34.19235.77435.07432.438.79422.516.26516.32213.578.48911.65910.668.9868.1148.665.6245.1653.3294.1052.9663.8810.690.5861.6080.6237740.7178470.327847NANANA1.518225NANANANANANANANANANANA
us-gaap:LiabilitiesCurrent █▇▇█▇▅▅▅▅▃▂▃▂▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▃▃▃▂▂▁▁60.53455.05954.87164.3954.90539.54539.08434.61333.83622.13714.39816.67414.18214.699.8928.5298.865.5034.9683.1944.6061.831.632.8551.8661961.9107171.661761.2586891.1564721.1094862.2699323.5090853.36907112.30695211.34888916.61029316.68397317.33529813.3493489.1293211.8701110.822867
us-gaap:OperatingLeaseLiabilityCurrent ▅▆▆▇▆▆▇█▇▆▁4.4285.9166.2847.1965.8736.4317.2528.377.4846.0590.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent ▆▆▆█▇▆▆▆▄▃▂▂▂▂▂▂▁▁▁1.7931.7181.7122.3142.0851.6751.6571.5210.980.8820.4890.4590.3880.4780.4960.2860.0870.1140.124NANANA0.147NANANANANANANANANANANANA0.6160.6160.8660.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
us-gaap:LiabilitiesNoncurrent ▇▇█▂▂▂▂▂▂▂▁47.84348.08357.0896.0634.3535.446.66.074.6664.4330.23NANANA0.297NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent NANA11.7142.3522.3522.3522.3520.0530.0530.0530.23NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ███▂▁▁▂▂▂▂▁46.84347.08345.3753.7112.0013.0884.2486.0174.6134.380.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo ▅▅█▁4.4234.4236.0632.018NANANA6.5144.589NA0.004589NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree ███▁4.5164.5164.2860.265NANANA0.0019870.001412NA0.001412NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour ███▁4.3724.3724.3750.273NANANA0.0001310.000144NA0.000144NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA4.281NANANANANANANA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive us-gaap:LeaseContractualTerm iova:FacilityLeasesNANA4.281NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA74.206NANANANANANANA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive us-gaap:LeaseContractualTerm iova:FacilityLeasesNANA74.206NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
us-gaap:StockholdersEquity █▇▇██▃▄▄▅▅▅▃▄▄▂▃▂▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁744.413647.431656.498711.841758.309243.313298.971355.063397.422434.932466.193254.16270.569292.558145.481165.441129.152149.886166.918179.131188.93698.938104.023109.369112.873396111.62686944.84508716.15818717.3788716.80605317.603717-3.340459-2.771322-12.278619-11.319476-16.581601-16.618362-17.258451-12.780918-5.690725-1.4039450.638085
us-gaap:CommonStockValue █▇▇▇▇▆▆▆▆▆▆▅▅▄▄▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▁▄▄▄▄▄▄▄▄0.0070.0060.0060.0060.0060.0050.0050.0050.0050.0050.0050.0040.0040.0030.0030.0030.0030.0030.0030.0030.0030.0020.0020.0020.0019640.001870.0014070.0011520.0011350.0009210.0008350.0006290.0005563.4e-050.0034120.0032620.0032620.0032620.003250.0032910.0032360.003068
us-gaap:AdditionalPaidInCapital █▇▇▇▇▅▅▁▁▄▄▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▁1731.3631552.9681486.6621473.4721461.207882.599869.3540.2390.372844.789838.984594.455576.917568.243394.651388.756330.318327.673323.994320.14311.268209.729207.95204.929200.832015193.239795121.160415NANANA81.884897NANANANANANANANANANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▁▂▂▃▃▃▄▄▅▅▅▆▆▆▆▆▇▇▇▇▇▇▇▇▇▇▇███████████████-986.993-905.642-830.193-761.796-703.225-640.207-570.612-507.044-457.557-410.006-372.76-340.185-306.355-275.695-249.18-223.326-201.177-177.8-157.116-141.428-122.669-111.106-104.222-95.845-88.227444-81.859953-76.561894-71.695179-68.896868-66.786699-64.527185-44.569042-35.159979-31.730724-30.684195-34.150436-33.476539-33.149255-27.376576-19.02499-13.206512-1.682476
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▁▁▁▁▁▁██▁▁▁▁0.0330.0960.0190.1550.3170.9120.22861.859854.5960.138-0.042-0.12-0.003NA0.00.00.00.0020.0290.1630.0780.0680.048NA0.021704NA0.0NANANANANANANANANANANANANANANA
us-gaap:StockIssuedDuringPeriodValueNewIssues ▃▂▁▁█160.2742.8850.00.043567.0NANANANANA236.7240.00.001162.092NANANANANANANANANANANANANANANANANANANANANANANA0.067919NANANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▇█▄▅▅▄▂▂▂▂▂▂▂▁14.41416.94110.1210.70610.5379.4125.4076.5986.4265.8465.1855.5165.2224.104NANANANA3.123NANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂▁▁▄▅▁▃▄▅▆▅▆▆▇▇▇▇▇█-54.008-62.391-62.692-40.515-36.635-65.292-53.822-42.182-33.795-29.09-31.549-27.928-23.923-17.849-20.964-21.446-17.496-18.803-12.159NANANANANANANANA-1.728763-1.322191-2.267363-2.25319-0.427072-0.68193-0.30.0-0.280739-1.20051-0.760217-2.709654-1.649502-1.265568-0.369592
us-gaap:NetCashProvidedByUsedInInvestingActivities ▅█▇▆▁█▇▇▇▇▄▅▆▇▇▇▇▇▇-159.16577.21158.753-52.955-423.756100.10526.8143.49558.6831.033-206.382-149.373-30.502-0.0220.05814.48725.3318.80225.765NANANANANANANANA-0.160272-0.002305-0.003437-1e-06-0.0127040.00.00.00.00.00.0-0.060737-0.0034550.0331390.002981
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▂▁▁█▁▁▁▁▁▄▁▁▃▁▂▁▁▁163.98250.3642.9581.166568.4653.8332.0880.6643.381-0.002239.34512.0223.36169.582.89956.054-0.6480.3830.216NANANANANANANANA0.6383451.820980.542521.7955630.01.251510.30.00.2651.216250.252.372.2950.7780.863137
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
us-gaap:DepreciationDepletionAndAmortization ██▅▄▂▁▃▅▃▂▁▁0.3660.3720.3210.3070.260.2520.2940.3150.2890.2710.2520.251NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncreaseDecreaseInAccountsPayable ▅▄▁█▄▂▅▃▅▅▃▄▄▅▄▄▄▄▄▄▄▄4.965-0.015-12.13216.2640.672-7.7686.081-3.3265.3694.582-3.2751.096-1.5535.239-1.779-0.8391.5211.4660.48-0.497-0.3290.096NANANANANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂▁▁▄▅▁▃▄▅▆▅▆▆▇▇▇▇▇█-54.008-62.391-62.692-40.515-36.635-65.292-53.822-42.182-33.795-29.09-31.549-27.928-23.923-17.849-20.964-21.446-17.496-18.803-12.159NANANANANANANANA-1.728763-1.322191-2.267363-2.25319-0.427072-0.68193-0.30.0-0.280739-1.20051-0.760217-2.709654-1.649502-1.265568-0.369592
us-gaap:NetIncomeLoss ▁▁▂▃▃▂▂▄▄▅▅▅▅▆▆▆▆▆▆▆▇▇▇▇▇▇▇▇██▇▇▇████▇▇▇▇█-81.351-75.449-68.397-58.571-63.018-69.595-63.568-49.487-47.551-36.95-32.575-33.83-30.66-26.515-25.854-22.149-23.377-20.684-15.689-18.758-11.563-6.884-8.36-7.635-6.36749-5.298059-4.651-2.79831-2.110169-2.259514-11.496516-9.409063-3.429255-1.0465293.466241-0.673896-0.327284-5.772679-8.351586-5.818478-10.959741-0.741922
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁▂▃▄▃▃▃▅▅▇▇▇▇█-81.351-75.449-68.397-58.571-63.018-69.595-63.568-49.487-47.551-36.95-32.575-33.83-30.66-26.515NANANANA-15.688-18.759-11.563-6.884-8.377-7.61745-6.367491-5.298059NANANANANANANA-1.0465293.466241-0.673897-0.327284-5.772679-8.351586-5.818478NANA
us-gaap:ShareBasedCompensation ▇█▅▅▅▅▃▃▃▃▃▃▃▂▁▁▂▂▂▄▂▁▁14.41416.94110.23210.70610.5379.4125.4076.5986.4265.8465.1855.45.24.1042.762.63.03.2963.1237.94.61.7792.745NANA1.4677531.0931920.9392830.919351.0707070.3898782.1399270.0873860.08738612.0964230.6976710.4694861.2272276.7120560.5325119.2110.114016
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▅█▇▆▁█▇▇▇▇▄▅▆▇▇▇▇▇▇-159.16577.21158.753-52.955-423.756100.10526.8143.49558.6831.033-206.382-149.373-30.502-0.0220.05814.48725.3318.80225.765NANANANANANANANA-0.160272-0.002305-0.003437-1e-06-0.0127040.00.00.00.00.00.0-0.060737-0.0034550.0331390.002981
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▄▄█▆▃▁▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁9.61610.70523.33517.8444.9750.6373.4261.2341.4330.8240.2950.4630.4180.022-0.0580.2630.0250.7980.740.7250.0540.0020.1510.0728670.136990.7821431.4260160.1602720.0023050.0034371e-060.0127040.00.00.00.00.00.00.059369-0.003455-0.0168610.002981
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▂▁▁█▁▁▁▁▁▄▁▁▃▁▂▁▁▁163.98250.3642.9581.166568.4653.8332.0880.6643.381-0.002239.34512.0223.36169.582.89956.054-0.6480.3830.216NANANANANANANANA0.6383451.820980.542521.7955630.01.251510.30.00.2651.216250.252.372.2950.7780.863137
us-gaap:ProceedsFromIssuanceOfLongTermDebt ▁█0.01.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7000.06000.06000.06000.06000.05000.05000.05000.05000.05000.05000.04000.04000.03000.03000.03000.03000.03000.03000.03000.03000.02000.02000.02000.01964.01870.01407.01152.01135.0921.0835.0629.0556.034.03412.03262.03262.03262.03250.03291.03236.03068.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.40.10.111.611.45.04.20.60.10.70.2

Shares Outstanding

us-gaap:SharesOutstanding us-gaap:StatementClassOfStock

us-gaap:SharesOutstanding

us-gaap:SeriesAPreferredStock


Shares
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-31
Value0.0001940.0001940.0001940.0001940.0001940.0001940.0001940.0001940.0001940.0001940.0016940.0016940.0016940.0016940.0016940.0016940.0056940.017
Percentage of SharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SeriesBPreferredStock


Shares
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-31
Value3.5811193.5811193.5811193.5811193.5811195.8548455.8548455.8548455.8548456.1276927.3782417.3782417.9466737.946673110.00.00.0
Percentage of SharesOutstanding1845937.61845937.61845937.61845937.61845937.63017961.33017961.33017961.33017961.33158604.1435551.4435551.4469107.0469107.0671111.70.00.00.0

us-gaap:SharesOutstanding us-gaap:StatementEquityComponents

us-gaap:CommonStock


Shares
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value14614612612612612312312397928973626158484847474433200.818806
Percentage of SharesOutstanding75708720.175481860.865372760.865160725.865047933.063825004.163605728.463616276.350219443.847804985.65289576.04319062.23674620.73656929.73446806.70.02865863.00.00.00.0592732.5117788.00.0

Weighted Average Number Of Share Outstanding Basic And Diluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted


Weighted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-30
Value0.1537510.147370.1467380.1464920.1331620.1265680.1262730.1240350.1235670.1234150.1190850.0950770.0902360.084350.0727940.0633320.0624570.0622860.062135951480.0479124745370.028271262420146.2413270.818806780.7829310.78136778
Percentage of WeightedAverageNumberOfShareOutstandingBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302020-06-30
Value-0.53-0.47
Percentage of EarningsPerShareBasic100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302020-06-30
Value-0.53-0.47
Percentage of EarningsPerShareDiluted100.0100.0

Earnings Per Share Basic And Diluted

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:EarningsPerShareBasicAndDiluted


Earnings
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-0.51-0.47-0.4-0.47-0.55-0.5-0.4-0.38-0.3-0.27-0.36-0.34-0.31-0.36-0.35-0.37-0.33-0.25-1.15-0.23-0.14-0.18-0.16-0.14-0.14-0.17-0.11-0.09-0.11-1.5-0.66-0.011.280.05-0.0100.07-0.11-0.07-0.15-0.01-0.01-0.010
Percentage of EarningsPerShareBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2020-09-302019-09-302018-09-302017-03-312016-06-302016-03-312015-06-302015-03-312014-06-302014-03-31
Value0.00.10.10.04.51.51.31.0173080.4389510.90165
Percentage of AllocatedShareBasedCompensationExpense0.0100.0100.00.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType

us-gaap:EmployeeStockOption


Allocated
Period End2021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302014-12-31
Value1610109.35.36.56.45.85.25.45.20.658512
Percentage of AllocatedShareBasedCompensationExpense0.00.00.00.00.06500.00.00.00.05400.00.00.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:EmployeeStockOption0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:PlanName

iova:TwoThousandTwentyEspp


Allocated
Period End2021-06-302021-03-31
Value0.50.3
Percentage of AllocatedShareBasedCompensationExpense0.00.0
Percentage of Revenues0.00.0
Percentage of Revenues iova:TwoThousandTwentyEspp0.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value-81414000.0-75372000.0-68533000.0-58733000.0-63613000.0-68903000.0-63587000.0-49620000.0-47317000.0-36770000.0-32497000.0-33947000.0-30663000.0-26515000.0-25854000.0-22149000.0-23379000.0-20711000.0-15822000.0-18673000.0-11553000.0-6864000.0-8367000.0-7597000.0-6345800.0-5298000.0-4867000.0-2798000.0-2110200.0
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1919161514131010109.0817.5257.1136.8276.9658.4854.593.9284.2595.085107.2642.8184.4222.6832.3852.9
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-81351000.0-75449000.0-68397000.0-58571000.0-63018000.0-69595000.0-63568000.0-49487000.0-47551000.0-36950000.0-32575000.0-33830000.0-30660000.0-26515000.0-25854000.0-22149000.0-23377000.0-20684000.0-15689000.0-18758000.0-11563000.0-6884000.0-8360000.0-7635000.0-6367500.0-5298100.0-4651000.0-2798300.0-2110200.0-2259500.0-11497000.0-9409100.0-3429300.0-1046500.03466200.0-673900.0-327280.0-5772700.0-8351600.0-5818500.0-10960000.0-564300.0-741920.0-713760.0-84629.0
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value-81351000.0-75449000.0-68397000.0-58571000.0-63018000.0-69595000.0-63568000.0-49487000.0-47551000.0-36950000.0-32575000.0-33830000.0-30660000.0-26515000.0-15688000.0-18759000.0-11563000.0-6884000.0-8377000.0-7617400.0-6367500.0-5298100.0-1046500.03466200.0-673900.0-327280.0-5772700.0-8351600.0-5818500.0
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.299.8100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value8175685863706551503934353126262223201518117.018.4547.6436.4402255.2980594.8681852.80252.1101692.259514119.4090631.029260.7049131.7227061.6276361.6464253.1361334.1847435.814141100.658250.4960770.1670270.084629
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-81426000.0-75570000.0-68534000.0-58966000.0-63627000.0-70810000.0-65110000.0-51611000.0-50165000.0-39986000.0-34943000.0-35060000.0-31378000.0-26877000.0-26071000.0-22343000.0-23581000.0-20882000.0-15922000.0-18979000.0-11727000.0-7010000.0-8454000.0-7643000.0-6440200.0-5298000.0-4868200.0-2802500.0-2110200.0-2259500.0-11498000.0-9409100.0-1029300.0-704910.0-1722700.0-1627600.0-1646400.0-3136100.0-4184700.0-5814100.0-10561000.0-658250.0-496080.0-167030.0-84629.0
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense

us-gaap:ResearchAndDevelopmentExpense


Research
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-03-31
Value625552434956544139302727241917171916108.4814.4634.1923.3234.9834.0556882.0110331.6868290.3538790.3612270.3026620.5593670.250.250.270.250.250.270.8861.7555610.00.0
Percentage of ResearchAndDevelopmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ResearchAndDevelopmentExpense dei:LegalEntity

iova:NationalCancerInstitute


Research
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.00.00.50.00.00.50.00.00.00.50.00.0
Percentage of ResearchAndDevelopmentExpense0.00.00.90.00.01.60.00.00.02.50.00.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues iova:NationalCancerInstitute0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ResearchAndDevelopmentExpense us-gaap:FiniteLivedIntangibleAssetsByMajorClass

iova:CooperativeResearchAndDevelopmentAgreement


Research
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-08-312016-06-30
Value0.50.50.50.50.50.70.50.50.50.50.50.50.50.50.50.50.50.50.5
Percentage of ResearchAndDevelopmentExpense0.80.91.21.00.91.31.21.31.61.81.82.02.52.82.82.53.00.011.2
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues iova:CooperativeResearchAndDevelopmentAgreement0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

iova:MoffittLicenseAgreementTwo


Research
Period End2021-03-312020-09-302020-03-312019-12-312019-09-302019-06-302018-06-30
Value0.02-0.080.020.080.010.10.1
Percentage of ResearchAndDevelopmentExpense0.0-0.20.00.10.00.30.4
Percentage of Revenues0.00.00.00.00.00.00.0
Percentage of Revenues iova:MoffittLicenseAgreementTwo0.00.00.00.00.00.00.0

iova:NovartisPharmaAgLicenseAgreement


Research
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.00.00.010.0
Percentage of ResearchAndDevelopmentExpense0.00.00.017.6
Percentage of Revenues0.00.00.00.0
Percentage of Revenues iova:NovartisPharmaAgLicenseAgreement0.00.00.00.0

iova:ResearchCollaborationAndClinicalGrantAgreementsWithMoffitt


Research
Period End2021-06-302020-06-302019-12-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value0.10.1-1.10.70.41.20.10.1
Percentage of ResearchAndDevelopmentExpense0.20.2-2.01.71.03.90.40.4
Percentage of Revenues0.00.00.00.00.00.00.00.0
Percentage of Revenues iova:ResearchCollaborationAndClinicalGrantAgreementsWithMoffitt0.00.00.00.00.00.00.00.0

iova:WuxiApptechIncManufacturingAndServicesAgreement


Research
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value4.83.44.42.85.76.78.49.26.83.84.54.53.32.83.33.13.34.2
Percentage of ResearchAndDevelopmentExpense7.76.18.46.511.611.815.522.117.312.316.416.113.414.118.817.516.825.3
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues iova:WuxiApptechIncManufacturingAndServicesAgreement0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ResearchAndDevelopmentExpense us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased

iova:ResearchCollaborationAndClinicalGrantAgreements


Research
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.20.10.10.10.20.00.20.20.3-1.00.61.00.6-3.12.01.7
Percentage of ResearchAndDevelopmentExpense0.40.20.20.20.40.00.50.51.0-3.62.14.13.0-17.611.38.7
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues iova:ResearchCollaborationAndClinicalGrantAgreements0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

iova:ResearchCollaborationAndClinicalGrantAgreementsWithMoffitt


Research
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.30.00.2-1.10.70.4
Percentage of ResearchAndDevelopmentExpense0.70.00.4-2.01.71.0
Percentage of Revenues0.00.00.00.00.00.0
Percentage of Revenues iova:ResearchCollaborationAndClinicalGrantAgreementsWithMoffitt0.00.00.00.00.00.0

iova:StrategicAllianceAgreement


Research
Period End2021-06-302021-03-312020-06-302020-03-312018-12-312018-09-302018-06-30
Value0.10.020.00.20.60.10.1
Percentage of ResearchAndDevelopmentExpense0.20.00.00.42.20.40.4
Percentage of Revenues0.00.00.00.00.00.00.0
Percentage of Revenues iova:StrategicAllianceAgreement0.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value85275076878281728834439543546148027028430715517313815517118219310010511211411346171818190.1686260.5977490.0283330.0294130.0286920.0656110.0768470.568433.4385960.4661661.460952
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value10810311170594445403826149.892
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.713.714.69.07.215.613.310.38.85.83.06.4

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value85275076878281728834439543546148027028430715517313815517118219310010511211411346171818190.1686260.5977490.0283330.0294130.0286920.0656110.0768470.568433.4385960.4661661.460952
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-312007-09-16
Value744647656711758243298355397434466254270292145165129149166179188981041091121114416171617-3.340459-2.771322-12.278619-11.319476-16.581601-16.618362-17.258451-12.780918-5.690725-1.4039450.638085-0.0134880.0022840.0610.0
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets87.386.385.491.092.884.486.789.791.294.297.093.895.095.293.695.193.696.597.198.297.698.298.597.598.498.396.492.893.892.988.6-1981.0-463.6-43336.8-38484.6-57791.7-25328.6-22458.2-2248.5-165.5-301.243.70.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementClassOfStock

us-gaap:SeriesBPreferredStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-31
Value0.0030.0030.0040.0040.0040.0040.0040.0040.0060.0060.0060.0060.0060.0070.0070.0080.0080.0110.00.00.0
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:SeriesBPreferredStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-312012-12-31
Value0.0330.0960.0190.1550.3170.9120.220.2390.3720.138-0.042-0.12-0.0030.00.00.0290.1630.0780.0680.0480.0380.00.00.0
Percentage of StockholdersEquity0.00.00.00.00.00.40.10.10.10.0-0.0-0.0-0.00.00.00.00.10.00.10.00.00.00.0-0.0
Percentage of Assets0.00.00.00.00.00.30.10.10.10.0-0.0-0.0-0.00.00.00.00.10.00.10.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-312007-09-16
Value1731155214861473146188286986185484483859457656839432332031120920720420019312187868381403119191716151413112.3174930.0594120.0594120.0594120.0
Percentage of StockholdersEquity232.6239.9226.5207.0192.7362.7290.8242.7215.0194.2180.0233.9213.2194.2271.3194.1178.7164.7212.0199.9187.4177.9173.1270.2542.2495.0495.9465.2-1214.9-1145.4-156.4-168.9-102.9-98.4-92.1-114.2-234.3-840.4363.2-440.52601.297.40.0
Percentage of Assets203.0206.9193.5188.4178.7306.1252.2217.8196.0183.1174.5219.5202.6184.9254.0188.5175.6160.8208.1196.8182.6175.0170.2260.5503.0464.1460.9412.024066.85310.467789.964992.259485.924930.320674.32567.1387.72531.1158.60.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-312007-09-16
Value0.0070.0060.0060.0060.0060.0050.0050.0050.0050.0050.0050.0040.0040.0030.0030.0030.0030.0030.0020.0020.0020.0019640.001870.0014070.0011520.0011350.0009210.0008350.0006290.0005563.4e-050.0034120.0032620.0032620.0032620.003250.0032910.0032360.0030680.0015880.0015880.0015880.0
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.20.5-11.869.52.60.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.40.10.111.611.45.04.20.60.10.70.20.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-312007-09-16
Value-986.993-905.642-830.193-761.796-703.225-640.207-570.612-507.044-457.557-410.006-372.76-340.185-306.355-275.695-249.18-157.116-141.428-122.669-111.106-104.222-95.845-88.227444-81.859953-76.561894-71.695179-68.89686816-64.527185-44.569042-35.159979-31.730724-30.684195-34.150436-33.476539-33.148255-27.376576-19.02499-13.206512-1.682476-0.074488-0.0587160.00.0
Percentage of StockholdersEquity-132.6-139.9-126.5-107.0-92.7-263.1-190.9-142.8-115.1-94.3-80.0-133.8-113.2-94.2-171.3-94.1-79.0-64.9-112.3-100.2-87.6-78.2-73.3-170.7-443.7-396.4100.0-366.61334.21268.7258.4271.1206.0201.4192.1214.2334.3940.7-263.7552.3-2570.80.00.0
Percentage of Assets-115.7-120.7-108.0-97.4-86.0-222.1-165.6-128.1-105.0-88.8-77.5-125.6-107.6-89.7-160.4-91.4-77.6-63.4-110.3-98.6-85.4-76.9-72.1-164.6-411.6-371.792.9-324.7-26430.7-5882.1-111992.1-104321.9-119024.2-51022.8-43135.4-4816.2-553.3-2833.0-115.20.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value6666056367237822563163674104444752652793021491711351521691801929910311011211144171818190.1386820.5787160.008150.0072750.0050.0243670.034050.5240813.2981080.3260651.300916
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets78.280.682.892.595.788.991.892.894.396.498.998.298.398.596.198.598.198.298.699.099.498.698.498.498.298.196.798.999.999.999.982.296.828.824.717.437.144.392.295.969.989.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-312007-12-162007-09-16
Value82131676816052133876548280246297145163114107106921018.94313101211144171817190.1298040.569580.00.00.00.0157390.00.5102170.9106080.2685650.7229941.2924690.7959430.2092630.0082570.0029050.00.0
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0
Percentage of Assets9.717.68.88.719.618.24.19.817.611.717.129.886.496.793.693.982.868.962.151.052.38.912.99.110.998.096.698.799.599.299.077.095.30.00.00.024.00.089.826.557.60.088.50.00.00.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value88138727316658194482548280246145106
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.418.49.59.420.320.15.611.218.911.717.129.886.493.662.1

Short Term Investments

us-gaap:ShortTermInvestments

us-gaap:ShortTermInvestments


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value573472562645611193293386
Percentage of ShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets67.362.973.182.674.867.085.080.4

us-gaap:ShortTermInvestments us-gaap:FinancialInstrument

us-gaap:CommercialPaper


Short
Period End2021-03-31
Value29
Percentage of ShortTermInvestments6.3
Percentage of Assets4.0
Percentage of Assets us-gaap:CommercialPaper0.0

us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Short
Period End2021-03-312020-12-312020-09-302020-06-302019-12-312018-12-31
Value629122427050120
Percentage of ShortTermInvestments13.116.434.844.317.431.3
Percentage of Assets8.312.028.733.114.825.2
Percentage of Assets us-gaap:USGovernmentCorporationsAndAgenciesSecurities0.00.00.00.00.00.0

us-gaap:USTreasurySecurities


Short
Period End2021-03-312020-12-312020-09-302020-06-302019-12-312018-12-31
Value380470421340242265
Percentage of ShortTermInvestments80.583.665.255.782.668.7
Percentage of Assets50.761.253.841.770.355.2
Percentage of Assets us-gaap:USTreasurySecurities0.00.00.00.00.00.0

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value10116.6639.44210109.4125.4336.7854.7356.8515.8633.6825.6443.9177.9956.4175.3963.0421.2740.7820.1930.2770.2450.3784090.1288830.0661340.0150740.0097440.010.0150.0050.0050.0050.0050.0050.0086280.034050.013864
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.21.50.91.21.33.72.71.41.61.01.42.21.31.82.54.64.63.51.80.70.40.20.30.20.30.10.10.10.10.10.13.00.817.617.017.413.244.32.4

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302014-12-312013-12-31
Value867864136.6435.4835.3865.1235.0984.4552.7792.6271.6357890.043758
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.110.58.43.81.43.53.13.73.32.62.62.33.50.2

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:ComputerEquipment


Property
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-31
Value0.6080.6190.270.2580.3370.3490.3310.2630.2550.2450.0850.0723680.043758
Percentage of PropertyPlantAndEquipmentGross0.70.80.42.05.16.46.15.15.05.53.14.4100.0
Percentage of Assets0.10.10.00.10.10.20.20.20.20.10.10.20.2
Percentage of Assets us-gaap:ComputerEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConstructionInProgress


Property
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value7670565.4170.1070.0130.1050.0320.2670.2760.0
Percentage of PropertyPlantAndEquipmentGross88.089.187.741.61.60.21.90.65.26.20.0
Percentage of Assets8.99.37.41.60.00.00.10.00.20.20.0
Percentage of Assets us-gaap:ConstructionInProgress0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Equipment


Property
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302014-12-312013-12-31
Value5.5344.9114.6564.534.163.2073.0642.9422.6982.4051.7031.5630.6884840.0
Percentage of PropertyPlantAndEquipmentGross6.46.27.234.862.658.556.957.452.954.061.359.542.10.0
Percentage of Assets0.60.70.61.30.92.11.82.11.71.41.61.41.50.0
Percentage of Assets us-gaap:Equipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LeaseholdImprovements


Property
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302014-12-312013-12-31
Value3.632.5732.5732.3721.7761.7261.7071.7071.7041.3810.8530.8530.7621610.0
Percentage of PropertyPlantAndEquipmentGross4.23.34.018.226.731.531.733.333.431.030.732.546.60.0
Percentage of Assets0.40.30.30.70.41.11.01.21.10.80.80.81.60.0
Percentage of Assets us-gaap:LeaseholdImprovements0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:MachineryAndEquipment


Property
Period End2021-06-30
Value0.082
Percentage of PropertyPlantAndEquipmentGross0.1
Percentage of Assets0.0
Percentage of Assets us-gaap:MachineryAndEquipment0.0

us-gaap:OfficeEquipment


Property
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302014-12-312013-12-31
Value0.480.480.480.4570.2630.1880.1790.1790.1740.1480.1380.2110.1127760.0
Percentage of PropertyPlantAndEquipmentGross0.60.60.73.54.03.43.33.53.43.35.08.06.90.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.20.20.0
Percentage of Assets us-gaap:OfficeEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value6316000.05950000.05578000.04498000.03960000.03033000.02791000.02545000.02302000.02081000.01643.01372000.01103000.0794000.0529870.0289670.0104220.038782.033730.032567.016002.013814.012020.010870.08915.07361.05809.04257.02704.01513.0595.00
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.70.80.71.30.82.01.61.81.51.20.01.41.00.70.50.30.20.20.20.20.18.22.038.430.325.78.95.50.50.00.10.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value8072593918138.5365.8564.4723.5042.6832.642.7062.2472.452.5952.5782.7962.3741.7691.1921.4091.6761.8332.0250562.128261.5315660.170990.0157710.0146280.0277560.0299440.0190330.0201830.0221380.0236920.0252440.0267970.0283490.0188030.0162990.0
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets9.49.77.75.02.34.72.51.51.00.80.61.01.00.71.61.51.91.81.41.00.61.41.61.61.81.93.31.00.10.10.117.83.271.275.382.638.534.95.00.53.50.0

Long Term Investments

us-gaap:LongTermInvestments

us-gaap:LongTermInvestments


Long
Period End2021-06-302021-03-31
Value4610
Percentage of LongTermInvestments100.0100.0
Percentage of Assets5.41.4

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value525554107.489.3051013119.9570.0
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets6.27.37.11.40.93.23.13.52.72.20.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value1.151.163123.3853.1823.483.4813.3953.3453.2882.7642.3312.2642.2753.6330.0
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.10.21.70.40.41.21.00.90.80.70.60.90.80.72.30.0

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value211313241010159.921127.5892.7396.0145.1966.5761.2322.9053.6952.1740.8630.2280.7251.0540.9581.1611.1569221.107371.2484130.5738010.440550.2863250.4129761.5508651.4808511.2917181.0982710.8416160.6092660.5042520.1900480.2068640.1306380.030292
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.61.81.83.21.33.74.52.52.91.60.62.21.82.10.81.72.71.40.50.10.41.00.91.01.01.02.73.32.41.62.1919.7247.74559.13734.02933.3928.6656.233.46.028.02.1

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value3435353238221616138.48911108.9868.1148.665.6245.1653.3294.1052.9663.8810.690.5861.6080.6237740.7178470.3278471.518225
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.04.84.64.14.77.84.74.13.11.82.43.93.22.65.63.23.72.12.41.62.00.70.61.40.50.60.77.6

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value60555464543939343322141614149.8928.5298.865.5034.9683.1944.6061.831.632.8551.8661961.9107171.661761.2586891.1564721.1094862.2699323.5090853.3690711211161617139.1293211.8701110.822867
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.17.37.18.26.713.711.38.77.84.83.06.25.04.86.44.96.43.52.91.82.41.81.52.51.61.73.67.26.26.111.42081.0563.643436.838584.657891.725428.622558.22348.5265.5401.256.3

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value4428000.05916000.06284000.07196000.05873000.06431000.07252000.08370000.07484000.06059000.00
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.50.80.80.90.72.22.12.11.71.30.0

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312012-09-302012-06-302012-03-312011-12-31
Value1793000.01718000.01712000.02314000.02085000.01675000.01657000.01521000.0980000.0882000.0489000.0459000.0388000.0478000.0496000.0286000.087000.0114000.0124000.0147000.0616000.0616000.0866000.00
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.20.20.20.30.30.60.50.40.20.20.10.20.10.20.30.20.10.10.10.12146.9938.91126.90.0

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent

us-gaap:LiabilitiesNoncurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value4748576.0634.3535.446.66.074.6664.4330.230.297
Percentage of LiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.66.47.40.80.51.91.91.51.11.00.00.2

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value112.3522.3522.3522.3520.0530.0530.0530.23
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.50.30.30.80.70.00.00.00.0

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value4647453.7112.0013.0884.2486.0174.6134.380.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets5.56.35.90.50.21.11.21.51.10.90.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302019-09-302019-06-302018-12-31
Value4423000.04423000.06063000.02018000.06514000.04589000.04589.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.60.80.31.61.10.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo us-gaap:LeaseContractualTerm

iova:CmoEmbeddedLeases


Lessee
Period End2020-12-312020-09-30
Value1782000.01680000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo29.483.3
Percentage of Assets0.20.2
Percentage of Assets iova:CmoEmbeddedLeases0.00.0

iova:FacilityLeases


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value4423000.04423000.04281000.0338000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.070.616.7
Percentage of Assets0.50.60.60.0
Percentage of Assets iova:FacilityLeases0.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302019-09-302019-06-302018-12-31
Value4516000.04516000.04286000.0265000.01987.01412.01412.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.60.60.00.00.00.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree us-gaap:LeaseContractualTerm

iova:FacilityLeases


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value4516000.04516000.04286000.0265000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0
Percentage of Assets0.50.60.60.0
Percentage of Assets iova:FacilityLeases0.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302019-09-302019-06-302018-12-31
Value4372000.04372000.04375000.0273000.0131.0144.0144.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.60.60.00.00.00.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour us-gaap:LeaseContractualTerm

iova:FacilityLeases


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value4372000.04372000.04375000.0273000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0
Percentage of Assets0.50.60.60.0
Percentage of Assets iova:FacilityLeases0.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-312018-12-31
Value4281000.00
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.00.0
Percentage of Assets0.60.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive us-gaap:LeaseContractualTerm

iova:FacilityLeases


Lessee
Period End2020-12-31
Value4281000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.6
Percentage of Assets iova:FacilityLeases0.0

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-312018-12-31
Value740.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.00.0
Percentage of Assets9.70.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive us-gaap:LeaseContractualTerm

iova:FacilityLeases


Lessee
Period End2020-12-31
Value74
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets9.7
Percentage of Assets iova:FacilityLeases0.0

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value515251107.8749.5191114121010
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.07.16.71.41.03.33.33.62.82.30.0

us-gaap:OperatingLeaseLiability us-gaap:LeaseContractualTerm

iova:CmoEmbeddedLeases


Operating
Period End2021-06-302021-03-312020-12-312020-09-30
Value2.6774.1737.7928.705
Percentage of OperatingLeaseLiability5.27.915.179.8
Percentage of Assets0.30.61.01.1
Percentage of Assets iova:CmoEmbeddedLeases0.00.00.00.0

iova:FacilityLeases


Operating
Period End2021-06-302021-03-312020-12-312020-09-30
Value4848432.202
Percentage of OperatingLeaseLiability94.892.184.920.2
Percentage of Assets5.76.55.70.3
Percentage of Assets iova:FacilityLeases0.00.00.00.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2021-06-302021-03-312020-12-312020-09-302019-09-302019-06-302018-12-312018-10-19
Value98101103110.0129480.0126060.0126060.059
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.513.513.51.50.00.00.00.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue us-gaap:LeaseContractualTerm

iova:CmoEmbeddedLeases


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value2.6954.248.079.168
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue2.74.27.879.6
Percentage of Assets0.30.61.11.2
Percentage of Assets iova:CmoEmbeddedLeases0.00.00.00.0

iova:FacilityLeases


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value9596952.346
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue97.395.892.220.4
Percentage of Assets11.212.912.40.3
Percentage of Assets iova:FacilityLeases0.00.00.00.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue us-gaap:LeaseContractualTerm, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType

iova:NewHeadquartersLease, iova:OfficeSpace, us-gaap:SubsequentEvent


Lessee
Period End2021-02-03
Value0.2795408
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue0.0
Percentage of Assets0.0
Percentage of Assets iova:NewHeadquartersLease iova:OfficeSpace us-gaap:SubsequentEvent0.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SubsequentEventType

iova:SanCarlosCalifornia, iova:Suite100AndSuit125FirstAmendment, iova:OfficeSpace, us-gaap:SubsequentEvent


Lessee
Period End2021-02-03
Value0.10318160000000001
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue0.0
Percentage of Assets0.0
Percentage of Assets iova:SanCarlosCalifornia iova:Suite100AndSuit125FirstAmendment iova:OfficeSpace us-gaap:SubsequentEvent0.0

iova:SanCarlosCalifornia, iova:Suite150SecondAmendment, iova:OfficeSpace, us-gaap:SubsequentEvent


Lessee
Period End2021-02-03
Value0.04410165
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue0.0
Percentage of Assets0.0
Percentage of Assets iova:SanCarlosCalifornia iova:Suite150SecondAmendment iova:OfficeSpace us-gaap:SubsequentEvent0.0

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value4748510.607
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0
Percentage of Assets5.56.46.70.1

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount us-gaap:LeaseContractualTerm

iova:CmoEmbeddedLeases


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value0.0180.0670.2780.463
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount0.00.10.576.3
Percentage of Assets0.00.00.00.1
Percentage of Assets iova:CmoEmbeddedLeases0.00.00.00.0

iova:FacilityLeases


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value4748510.144
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.099.999.523.7
Percentage of Assets5.56.46.70.0
Percentage of Assets iova:FacilityLeases0.00.00.00.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-312007-09-16
Value744647656711758243298355397434466254270292145165129149166179188981041091121114416171617-3.340459-2.771322-12.278619-11.319476-16.581601-16.618362-17.258451-12.780918-5.690725-1.4039450.638085-0.0134880.0022840.0610.0
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets87.386.385.491.092.884.486.789.791.294.297.093.895.095.293.695.193.696.597.198.297.698.298.597.598.498.396.492.893.892.988.6-1981.0-463.6-43336.8-38484.6-57791.7-25328.6-22458.2-2248.5-165.5-301.243.70.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementClassOfStock

us-gaap:SeriesBPreferredStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-31
Value0.0030.0030.0040.0040.0040.0040.0040.0040.0060.0060.0060.0060.0060.0070.0070.0080.0080.0110.00.00.0
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:SeriesBPreferredStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-312012-12-31
Value0.0330.0960.0190.1550.3170.9120.220.2390.3720.138-0.042-0.12-0.0030.00.00.0290.1630.0780.0680.0480.0380.00.00.0
Percentage of StockholdersEquity0.00.00.00.00.00.40.10.10.10.0-0.0-0.0-0.00.00.00.00.10.00.10.00.00.00.0-0.0
Percentage of Assets0.00.00.00.00.00.30.10.10.10.0-0.0-0.0-0.00.00.00.00.10.00.10.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-312007-09-16
Value1731155214861473146188286986185484483859457656839432332031120920720420019312187868381403119191716151413112.3174930.0594120.0594120.0594120.0
Percentage of StockholdersEquity232.6239.9226.5207.0192.7362.7290.8242.7215.0194.2180.0233.9213.2194.2271.3194.1178.7164.7212.0199.9187.4177.9173.1270.2542.2495.0495.9465.2-1214.9-1145.4-156.4-168.9-102.9-98.4-92.1-114.2-234.3-840.4363.2-440.52601.297.40.0
Percentage of Assets203.0206.9193.5188.4178.7306.1252.2217.8196.0183.1174.5219.5202.6184.9254.0188.5175.6160.8208.1196.8182.6175.0170.2260.5503.0464.1460.9412.024066.85310.467789.964992.259485.924930.320674.32567.1387.72531.1158.60.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-312007-09-16
Value0.0070.0060.0060.0060.0060.0050.0050.0050.0050.0050.0050.0040.0040.0030.0030.0030.0030.0030.0020.0020.0020.0019640.001870.0014070.0011520.0011350.0009210.0008350.0006290.0005563.4e-050.0034120.0032620.0032620.0032620.003250.0032910.0032360.0030680.0015880.0015880.0015880.0
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.20.5-11.869.52.60.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.40.10.111.611.45.04.20.60.10.70.20.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-312007-12-312007-09-16
Value-986.993-905.642-830.193-761.796-703.225-640.207-570.612-507.044-457.557-410.006-372.76-340.185-306.355-275.695-249.18-157.116-141.428-122.669-111.106-104.222-95.845-88.227444-81.859953-76.561894-71.695179-68.89686816-64.527185-44.569042-35.159979-31.730724-30.684195-34.150436-33.476539-33.148255-27.376576-19.02499-13.206512-1.682476-0.074488-0.0587160.00.0
Percentage of StockholdersEquity-132.6-139.9-126.5-107.0-92.7-263.1-190.9-142.8-115.1-94.3-80.0-133.8-113.2-94.2-171.3-94.1-79.0-64.9-112.3-100.2-87.6-78.2-73.3-170.7-443.7-396.4100.0-366.61334.21268.7258.4271.1206.0201.4192.1214.2334.3940.7-263.7552.3-2570.80.00.0
Percentage of Assets-115.7-120.7-108.0-97.4-86.0-222.1-165.6-128.1-105.0-88.8-77.5-125.6-107.6-89.7-160.4-91.4-77.6-63.4-110.3-98.6-85.4-76.9-72.1-164.6-411.6-371.792.9-324.7-26430.7-5882.1-111992.1-104321.9-119024.2-51022.8-43135.4-4816.2-553.3-2833.0-115.20.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7000.06000.06000.06000.06000.05000.05000.05000.05000.05000.05000.04000.04000.03000.03000.03000.03000.03000.03000.03000.03000.02000.02000.02000.01964.01870.01407.01152.01135.0921.0835.0629.0556.034.03412.03262.03262.03262.03250.03291.03236.03068.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.40.10.111.611.45.04.20.60.10.70.2

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value173115521486147314618828690.2390.37284483859457656839438833032732332031120920720420019312181
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets203.0206.9193.5188.4178.7306.1252.20.10.1183.1174.5219.5202.6184.9254.0223.5239.3210.9188.5175.6160.8208.1196.8182.6175.0170.2260.5412.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value-986990000.0-905640000.0-830190000.0-761800000.0-703220000.0-640210000.0-570610000.0-507040000.0-457560000.0-410010000.0-372760000.0-340180000.0-306360000.0-275700000.0-249180000.0-223330000.0-201180000.0-177800000.0-157120000.0-141430000.0-122670000.0-111110000.0-104220000.0-95845000.0-88227000.0-81860000.0-76562000.0-71695000.0-68897000.0-66787000.0-64527000.0-44569000.0-35160000.0-31731000.0-30684000.0-34150000.0-33477000.0-33149000.0-27377000.0-19025000.0-13207000.0-1682500.0
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-115.7-120.7-108.0-97.4-86.0-222.1-165.6-128.1-105.0-88.8-77.5-125.6-107.6-89.7-160.4-128.4-145.8-114.4-91.4-77.6-63.4-110.3-98.6-85.4-76.9-72.1-164.6-411.6-371.7-369.3-324.7-26430.7-5882.1-111992.1-104321.9-119024.2-51022.8-43136.7-4816.2-553.3-2833.0-115.2

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302014-12-31
Value0.0330.0960.0190.1550.3170.9120.228618540.138-0.042-0.12-0.0030.00.00.00.0020.0290.1630.0780.0680.0480.0217040.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.00.00.00.00.00.30.1217.8196.00.0-0.0-0.0-0.00.00.00.00.00.00.10.00.10.00.00.0

Stock Issued During Period Value New Issues

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:StockIssuedDuringPeriodValueNewIssues


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302018-12-312018-09-302018-06-302018-03-312012-03-312007-12-31
Value160420.00.0435672360.00.0011620.0679190.008
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:Range, us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock, us-gaap:TypeOfArrangement

srt:Maximum, us-gaap:SubsequentEvent, iova:AtMarketOffering, iova:SalesAgreementWithJefferriesLlc


Stock
Period End2021-02-08
Value350
Percentage of StockIssuedDuringPeriodValueNewIssues0.0
Percentage of Assets0.0
Percentage of Assets srt:Maximum us-gaap:SubsequentEvent iova:AtMarketOffering iova:SalesAgreementWithJefferriesLlc0.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302018-12-312018-09-302018-06-302018-03-312012-03-312007-12-31
Value160420.00.0435662360.00.0011620.0679090.007472
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.00.0100.0100.0100.00.0100.0100.0100.093.4
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

us-gaap:CommonStock


Stock
Period End2021-06-302020-12-312020-09-302020-06-302018-12-312013-07-312012-03-312007-12-31
Value0.0010.00.00.0010.0016.71e-050.000528
Percentage of StockIssuedDuringPeriodValueNewIssues0.00.00.00.00.00.00.06.6
Percentage of Assets0.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.0

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-31
Value14161010109.4125.4076.5986.4265.8465.1855.5165.2224.1043.123
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-31
Value14161010109.4125.4076.5986.4265.8465.1855.5165.2224.1043.123
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-54008000.0-62391000.0-62692000.0-40515000.0-36635000.0-65292000.0-53822000.0-42182000.0-33795000.0-29090000.0-31549000.0-27928000.0-23923000.0-17849000.0-20964000.0-21446000.0-17496000.0-18803000.0-12159000.0-1728800.0-1322200.0-2267400.0-2253200.0-427070.0-681930.0-300000.00-280740.0-1200500.0-760220.0-2709700.0-1649500.0-1265600.0-564480.0-369590.0-113320.0
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-159.1657758-52.955-423.756100263.495581.033-206.382-149.373-30.502-0.0220.05814251825-0.160272-0.002305-0.003437-1e-06-0.0127040.00.00.00.00.00.0-0.060737-0.0034550.033139-0.050.0029810.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0100.0100.0100.0100.0100.00.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value163502.9581.1665683.8332.0880.6643.381-0.002239123.361692.89956-0.6480.3830.2160.6383451.820980.5425210.01.251510.30.00.2651.216250.252.372.2950.7780.0450.8631370.7
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value366000.0372000.0321000.0307000.0260000.0252000.0294000.0315000.0289000.0271000.0252000.0251000.0
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value4.965-0.015-12.132160.672-7.7686.081-3.3265.3694.582-3.2751.096-1.5535.239-1.779-0.8391.5211.4660.48-0.497-0.3290.096
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-54008000.0-62391000.0-62692000.0-40515000.0-36635000.0-65292000.0-53822000.0-42182000.0-33795000.0-29090000.0-31549000.0-27928000.0-23923000.0-17849000.0-20964000.0-21446000.0-17496000.0-18803000.0-12159000.0-1728800.0-1322200.0-2267400.0-2253200.0-427070.0-681930.0-300000.00-280740.0-1200500.0-760220.0-2709700.0-1649500.0-1265600.0-564480.0-369590.0-113320.0
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-81351000.0-75449000.0-68397000.0-58571000.0-63018000.0-69595000.0-63568000.0-49487000.0-47551000.0-36950000.0-32575000.0-33830000.0-30660000.0-26515000.0-25854000.0-22149000.0-23377000.0-20684000.0-15689000.0-18758000.0-11563000.0-6884000.0-8360000.0-7635000.0-6367500.0-5298100.0-4651000.0-2798300.0-2110200.0-2259500.0-11497000.0-9409100.0-3429300.0-1046500.03466200.0-673900.0-327280.0-5772700.0-8351600.0-5818500.0-10960000.0-564300.0-741920.0-713760.0-84629.0
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value-81351000.0-75449000.0-68397000.0-58571000.0-63018000.0-69595000.0-63568000.0-49487000.0-47551000.0-36950000.0-32575000.0-33830000.0-30660000.0-26515000.0-15688000.0-18759000.0-11563000.0-6884000.0-8377000.0-7617400.0-6367500.0-5298100.0-1046500.03466200.0-673900.0-327280.0-5772700.0-8351600.0-5818500.0
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.299.8100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value14161010109.4125.4076.5986.4265.8465.1855.45.24.1042.762.63.03.2963.1237.94.61.7792.7451.4677531.0931920.9392830.919351.0707070.3898782.1399270.0873860.087386120.6976710.4694861.2272276.7120560.5325119.2110.0403020.1140160.0
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:ShareBasedCompensation us-gaap:RelatedPartyTransaction

iova:ConsultingAgreement


Share
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.00.00.10.10.10.10.10.1-0.30.40.20.40.10.1
Percentage of ShareBasedCompensation0.00.00.91.11.81.51.61.7-5.87.43.89.73.63.8

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-159.1657758-52.955-423.756100263.495581.033-206.382-149.373-30.502-0.0220.05814251825-0.160272-0.002305-0.003437-1e-06-0.0127040.00.00.00.00.00.0-0.060737-0.0034550.033139-0.050.0029810.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0100.0100.0100.0100.0100.00.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value9.6161023174.9750.6373.4261.2341.4330.8240.2950.4630.4180.022-0.0580.2630.0250.7980.740.7250.0540.0020.1510.0728670.136990.7821431.4260160.1602720.0023050.0034371e-060.0127040.00.00.00.00.00.00.059369-0.003455-0.0168610.00.0029810.0
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0100.0100.0100.00.0100.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value163502.9581.1665683.8332.0880.6643.381-0.002239123.361692.89956-0.6480.3830.2160.6383451.820980.5425210.01.251510.30.00.2651.216250.252.372.2950.7780.0450.8631370.7
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2021-06-302021-03-31
Value01000000.0
Percentage of ProceedsFromIssuanceOfLongTermDebt0.0100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312014-03-312013-12-312011-12-312010-12-31
Value129.4947126.8892876.0723686.233150.638750.278759.2751.15
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

iova:RangeOfExercisePricesEight


Share
Period End2020-12-312019-12-312018-12-31
Value1.3699461.0460.96142
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber10.911.014.0

iova:RangeOfExercisePricesFive


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value1.481860.118950.71250.864286
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber11.71.310.314.2

iova:RangeOfExercisePricesFour


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value1.3775970.96290.8042831.358166
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber10.910.111.722.4

iova:RangeOfExercisePricesNine


Share
Period End2020-12-312019-12-312018-12-31
Value1.40650.99480.206
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber11.110.53.0

iova:RangeOfExercisePricesOne


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value1.3071331.08631.12380.9592
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber10.411.416.315.8

iova:RangeOfExercisePricesSeven


Share
Period End2020-12-312019-12-312018-12-31
Value0.25631.283110.6907
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber2.013.510.0

iova:RangeOfExercisePricesSix


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value1.29111.57490.732851.060666
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber10.216.610.617.5

iova:RangeOfExercisePricesTen


Share
Period End2020-12-312019-12-312018-12-31
Value1.743650.0440.002
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber13.80.50.0

iova:RangeOfExercisePricesThree


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value1.0720160.9701070.8976250.8975
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber8.510.213.014.8

iova:RangeOfExercisePricesTwo


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value1.3095361.4136450.7581090.93255
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber10.414.911.015.4

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice


Share
Period End2021-03-312020-12-312019-12-312018-12-312017-12-312016-12-312014-03-312013-12-312011-12-312010-12-31
Value24.3518.0812.010.257.427.2413.8723.11.090.03
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice us-gaap:OptionIndexedToIssuersEquityType

us-gaap:EmployeeStockOption


Share
Period End2021-06-302020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-312012-12-31
Value23.718.0817.0416.3712.011.6410.8910.410.2510.159.669.347.427.337.287.347.247.136.757.158.127.3123.1109.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice0.0100.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.00.00.0100.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

iova:RangeOfExercisePricesEight


Share
Period End2020-12-312019-12-312018-12-31
Value23.8817.6216.66
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice132.1146.8162.5

iova:RangeOfExercisePricesFive


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value15.5711.068.997.83
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice86.192.287.7105.5

iova:RangeOfExercisePricesFour


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value11.269.77.867.52
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice62.380.876.7101.3

iova:RangeOfExercisePricesNine


Share
Period End2020-12-312019-12-312018-12-31
Value25.3221.7921.24
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice140.0181.6207.2

iova:RangeOfExercisePricesOne


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value5.985.565.555.32
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice33.146.354.171.7

iova:RangeOfExercisePricesSeven


Share
Period End2020-12-312019-12-312018-12-31
Value23.5914.9315.13
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice130.5124.4147.6

iova:RangeOfExercisePricesSix


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value19.7311.2611.6610.46
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice109.193.8113.8141.0

iova:RangeOfExercisePricesTen


Share
Period End2020-12-312019-12-312018-12-31
Value35.2542.15117.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice195.0351.21141.5

iova:RangeOfExercisePricesThree


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value9.68.447.556.99
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice53.170.373.794.2

iova:RangeOfExercisePricesTwo


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value7.677.256.926.02
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice42.460.467.581.1

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value112.3520.0530.0750.3780.00.00.00.0
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.00.00.00.00.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value14106.3444.1110.00.00.0
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.00.00.00.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value189128784741158.428156-3.679022-6.957129
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0

iova:AcquisitionsOfPropertyAndEquipmentIncludedInAccountsPayableAndAccruedExpense

iova:AcquisitionsOfPropertyAndEquipmentIncludedInAccountsPayableAndAccruedExpense


Acquisitions
Period End2021-06-302021-03-312020-06-302020-03-31
Value-1880000.03258000.0526000.04686000.0
Percentage of AcquisitionsOfPropertyAndEquipmentIncludedInAccountsPayableAndAccruedExpense100.0100.0100.0100.0

iova:CommonStockIssuedFromPreferredStockConversion us-gaap:StatementClassOfStock

iova:CommonStockIssuedFromPreferredStockConversion

us-gaap:SeriesBPreferredStock


Common
Period End2021-06-302021-03-312019-12-312019-09-30
Value0-1000.00-2000.0
Percentage of CommonStockIssuedFromPreferredStockConversion0.0100.00.0100.0

iova:CommonStockIssuedFromPreferredStockConversion us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Common
Period End2021-06-302021-03-312019-12-312019-09-30
Value01000.002000.0
Percentage of CommonStockIssuedFromPreferredStockConversion0.0-100.00.0-100.0

iova:ConvertiblePricePerShares us-gaap:StatementClassOfStock

iova:ConvertiblePricePerShares

us-gaap:SeriesBPreferredStock


Convertible
Period End2021-06-302021-03-312020-12-31
Value04.750
Percentage of ConvertiblePricePerShares0.0100.00.0

iova:IncreaseDecreaseInOperatingLeaseLiabilities

iova:IncreaseDecreaseInOperatingLeaseLiabilities


Increase
Period End2021-06-302021-03-312020-06-302020-03-312019-09-302019-03-31
Value-1728000.01340000.0-3749000.010000.05000000.01000000.0
Percentage of IncreaseDecreaseInOperatingLeaseLiabilities100.0100.0100.0100.0100.0100.0

iova:IncreaseDecreaseInOperatingLeaseRightOfUseAsset

iova:IncreaseDecreaseInOperatingLeaseRightOfUseAsset


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-03-31
Value-5895000.0-1840000.0-1278000.0-2461000.0-1834000.0-1663000.0-1709000.0-942000.00
Percentage of IncreaseDecreaseInOperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.00.0

iova:IncreaseDecreaseInOperatingLeaseRightOfUseAssets

iova:IncreaseDecreaseInOperatingLeaseRightOfUseAssets


Increase
Period End2021-06-302021-03-312020-03-312019-09-302019-03-31
Value-2501000.02660000.0500000.04500000.01000000.0
Percentage of IncreaseDecreaseInOperatingLeaseRightOfUseAssets100.0100.0100.0100.0100.0

iova:IncreaseDecreaseInRightOfUseAssetsFromLeaseModifications

iova:IncreaseDecreaseInRightOfUseAssetsFromLeaseModifications


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-215000.02159000.0772000.0206000.0-151000.0479000.0-1038000.01056000.02642000.0
Percentage of IncreaseDecreaseInRightOfUseAssetsFromLeaseModifications100.0100.0100.0100.0100.0100.0100.0100.0100.0

iova:MinimumAverageSalary us-gaap:Range, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

iova:MinimumAverageSalary

srt:Minimum, iova:JobCreationLoan, us-gaap:SubsequentEvent


Minimum
Period End2021-01-26
Value80000.0
Percentage of MinimumAverageSalary100.0

iova:NonCashLeaseExpense

iova:NonCashLeaseExpense


Non
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-03-31
Value122000.02285000.02573000.01671000.01458000.01870000.01989000.01934000.01607000.01424000.00
Percentage of NonCashLeaseExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

iova:PaymentsForUpfrontLicensingFee us-gaap:FiniteLivedIntangibleAssetsByMajorClass

iova:PaymentsForUpfrontLicensingFee

iova:MoffittLicenseAgreementOne


Payments
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302014-06-28
Value00100000.000100000.000100000.0
Percentage of PaymentsForUpfrontLicensingFee0.00.0100.00.00.0100.00.00.0100.0

iova:PercentageOfCommissionOnGrossSaleProceeds us-gaap:Range, us-gaap:SubsequentEventType, us-gaap:TypeOfArrangement

iova:PercentageOfCommissionOnGrossSaleProceeds

srt:Maximum, us-gaap:SubsequentEvent, iova:SalesAgreementWithJefferriesLlc


Percentage
Period End2021-02-08
Value3.0
Percentage of PercentageOfCommissionOnGrossSaleProceeds100.0

iova:SalesAgreementCommissionMaximumPercentageOfGrossSalesProceeds us-gaap:SubsidiarySaleOfStock

iova:SalesAgreementCommissionMaximumPercentageOfGrossSalesProceeds

iova:AtMarketOfferingProgram


Sales
Period End2021-02-08
Value3.0
Percentage of SalesAgreementCommissionMaximumPercentageOfGrossSalesProceeds100.0

iova:Shortterminvestmentsforsale

iova:Shortterminvestmentsforsale


Shortterminvestmentsforsale
Period End2021-03-31
Value461
Percentage of Shortterminvestmentsforsale100.0

iova:ThresholdAverageSalaryOfFullTimeEmployeesForLoanForgiveness us-gaap:DebtInstrument

iova:ThresholdAverageSalaryOfFullTimeEmployeesForLoanForgiveness

iova:JobCreationLoan


Threshold
Period End2021-01-26
Value80000.0
Percentage of ThresholdAverageSalaryOfFullTimeEmployeesForLoanForgiveness100.0

iova:UnrealizedGainLossOnShortTermInvestments

iova:UnrealizedGainLossOnShortTermInvestments


Unrealized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-63000.077000.0-136000.0-162000.0-595000.0692000.0-19000.0-133000.0234000.0180000.0
Percentage of UnrealizedGainLossOnShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

iova:WeightedAveragePricePerShare us-gaap:SubsidiarySaleOfStock

iova:WeightedAveragePricePerShare

iova:AtMarketOfferingProgram


Weighted
Period End2021-06-30
Value31.49
Percentage of WeightedAveragePricePerShare100.0

us-gaap:AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet

us-gaap:AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet


Adjustment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-30
Value-1000.00-165000.0-118000.0-119000.0-99000.0-23000.071000.0404000.0-59000.0-62000.060000.0-18000.0-275000.0
Percentage of AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-30
Value-1000.00-165000.0-118000.0-119000.0-99000.0-23000.071000.0404000.0-59000.0-62000.060000.0-18000.0-275000.0
Percentage of AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfDebtDiscountPremium

us-gaap:AmortizationOfDebtDiscountPremium


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-03-312010-12-312010-09-30
Value1796000.02066000.01506000.0376000.033000.0-50000.0-386000.0-605000.0-1198000.0-1232000.0-944000.0-387000.0-1000.000-18000.09000.028000.0-5000.0-69000.00000000497890.007598400.0-2598400.0000
Percentage of AmortizationOfDebtDiscountPremium100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.0100.00.0100.0100.00.00.00.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-49.19165-0.981-92.30410838-24.92-38.02328-28.0591.414-165.279
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConversionOfStockAmountConverted1

us-gaap:ConversionOfStockAmountConverted1


Conversion
Period End2021-06-302021-03-312019-12-312018-12-312018-09-302017-12-312017-09-302016-12-31
Value01000.00001000.000
Percentage of ConversionOfStockAmountConverted10.0100.00.00.00.0100.00.00.0

us-gaap:Depreciation

us-gaap:Depreciation


Depreciation
Period End2021-06-302021-03-312020-06-302020-03-312015-12-312015-09-302014-12-312014-09-30
Value300000.0400000.0200000.0300000.0308000.0266000.065221.05000.0
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedLiabilities

us-gaap:IncreaseDecreaseInAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312012-06-302012-03-31
Value3.878-14.40115-10.558144.3642.2422.7525.08-3.3461.2291.6740.872-0.5463.2220.2731.836-0.7761.409-1.1853.1050.104-0.250.866
Percentage of IncreaseDecreaseInAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-1029000.0-7130000.06754000.0-1130000.0-252000.01316000.04063000.0-1300000.02107000.0-1592000.01421000.02248000.0-1972000.0368000.0-4078000.01578000.01021000.02354000.01768000.0492000.0589000.0-84000.032000.0-133280.0249530.062749.024993.0-38069.0-144130.049625.0164840.0-257.017285.0-875.0-12275.0-19628.0-25422.020186.0-46470.026000.0-7792.06845.0
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterest

us-gaap:InvestmentIncomeInterest


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312014-09-30
Value75000.0121000.0137000.0395000.0609000.01215000.01542000.02124000.02614000.03036000.02368000.01230000.0718000.0362000.0217000.0194000.0204000.0198000.0234000.0221000.0164000.0126000.077000.08000.072735.01000.05000.0
Percentage of InvestmentIncomeInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LeaseCost

us-gaap:LeaseCost


Lease
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4.9974.1444.6533.383.3473.0245.6384.1952.7442.509
Percentage of LeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3380000.03398000.03367000.01652000.02073000.01636000.03724000.02214000.01681000.01594000.0
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseExpense us-gaap:StatementGeographical

us-gaap:OperatingLeaseExpense

iova:PhiladelphiaPennsylvania


Operating
Period End2020-08-01
Value6500.0
Percentage of OperatingLeaseExpense100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-10-19
Value2512000.02322000.02377000.01893000.01906000.02200000.02722000.02500000.02000000.01400000.059000.0
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-63000.077000.0-136000.0-162000.0-595000.0692000.0-19000.0-133000.0234000.0180000.078000.0-117000.0-3000.0000-2000.0-27000.0-134000.085000.010000.020000.010000.038000.021704.00
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302016-12-312016-09-302016-06-302016-03-312015-12-31
Value-63000.077000.0-136000.0-162000.0-595000.0692000.0-19000.0-133000.0234000.0180000.078000.0-117000.0-3000.0-134000.085000.010000.020000.010000.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value1000.00165000.0118000.0119000.098000.024000.071000.042000.059000.060000.062000.049000.042000.01157000.04000.0288000.05000.0349000.0000
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value311702361765211263
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromIssuanceOfCommonStock


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-03-312018-12-312018-10-172018-09-302018-06-302018-03-312018-01-312017-12-312017-09-252017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-032015-03-312014-12-222014-12-312014-09-302013-12-312013-09-302013-05-222013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value160420.0-0.355670.02362360.0-0.093162162-0.38853540.00.00.00.0950.0-0.0010.0001620.0686832320.05.8868030.01.351.240010.00.00.00.00.250.00.00.8280.0450.8450.7
Percentage of ProceedsFromIssuanceOfCommonStock100.0100.00.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.00.0100.0100.00.0100.0100.0100.0100.00.0100.00.0100.0100.00.00.00.00.0100.00.00.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfCommonStock us-gaap:SubsidiarySaleOfStock

iova:AtMarketOfferingProgram


Proceeds
Period End2021-06-302021-03-31
Value16042
Percentage of ProceedsFromIssuanceOfCommonStock100.0100.0

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1611583181411031139415717291410.00.00.00.01425192626283954114.00.0
Percentage of ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProceedsFromStockOptionsExercised


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value3.7126.4792.9591.5161.2373.9512.2070.7623.4050.0691.5931.5381.1985.633.0621.9080.4150.2310.1480.2410.2370.00.1890.066
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2021-03-312020-12-312020-09-302019-12-312019-09-302019-06-30
Value0.618454.6670.03.4260.667
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.00.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate


Share
Period End2021-03-312020-03-312019-06-302019-03-312015-09-30
Value70.350.699900.70782.1138
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate100.0100.00.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate us-gaap:Range

srt:Maximum


Share
Period End2020-09-302019-12-312018-12-312018-09-302018-06-302018-03-31
Value70.25200002.0028
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate0.00.00.00.00.00.0

srt:Minimum


Share
Period End2020-09-302019-12-312018-12-312018-09-302018-06-302018-03-31
Value69.29-0.001500-0.03311.7085
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate0.00.00.00.00.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate


Share
Period End2021-03-312020-03-312019-06-302019-03-312015-12-312015-09-30
Value0.360.018300.0259-0.00010.0157
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate100.0100.00.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap:Range

srt:Maximum


Share
Period End2020-09-302019-12-312018-12-312018-09-302018-06-302018-03-31
Value1.81170000.0020.0277
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate0.00.00.00.00.00.0

srt:Minimum


Share
Period End2020-09-302019-12-312018-12-312018-09-302018-06-302018-03-31
Value0.2863-0.00250000.0227
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate0.00.00.00.00.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice


Share
Period End2021-03-31
Value29.79
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-2.0426.420.950.170.5315.670.580.920.996.99-0.820-0.2615.520.125.815.987.360.038.976.19
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice


Share
Period End2021-03-31
Value15.31
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice


Share
Period End2021-03-31
Value45.4
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice100.0

us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice us-gaap:OptionIndexedToIssuersEquityType

us-gaap:EmployeeStockOption


Share
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value0.521.3124.580.941.71.2710.82-0.53-0.41-0.1615.830.09-0.37-0.517.470.31
Percentage of ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1


Sharebased
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value14161010109.4125.4076.5986.4265.846-14.8219735.5165.2224.1042.762.6193.2933.2963.1238.6455.3571.7792.7472.3871.9231.4671.0920.94
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 us-gaap:AwardType

iova:TwoThousandTwentyEspp


Sharebased
Period End2021-06-302021-03-31
Value0.5320.281
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost13.71.7

us-gaap:EmployeeStockOption


Sharebased
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
Value12161010109.3455.2966.536.3595.7795.1185.4485.155
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost188.798.399.4100.099.699.397.999.099.098.9-34.598.898.7

us-gaap:RestrictedStockUnitsRSU


Sharebased
Period End2021-06-302020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1.0990.00.0450.0670.1110.0680.0670.0670.0670.0680.067
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost17.60.00.40.72.11.01.01.1-0.51.21.3

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 us-gaap:IncomeStatementLocation

us-gaap:GeneralAndAdministrativeExpense


Sharebased
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value5.8297.7395.575.4245.0725.0942.7783.2523.7063.145-8.1952783.2612.8412.1041.8261.5661.3971.9091.6748.0054.7641.1942.5481.5331.1141.08
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost140.445.754.450.748.154.151.449.357.753.855.359.154.451.366.259.842.457.953.692.688.967.192.864.257.973.6

us-gaap:ResearchAndDevelopmentExpense


Sharebased
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value8.5859.2024.6625.2825.4654.3182.6293.3462.722.701-6.6266952.2552.3812.00.9341.0531.8961.3871.4490.640.5930.5850.1980.8950.8090.3870.3270.282
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost159.654.345.649.351.945.948.650.742.346.244.740.945.648.733.840.257.642.146.47.411.132.97.237.542.126.429.930.0

us-gaap:ShortTermLeaseCost

us-gaap:ShortTermLeaseCost


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value39000.036000.034000.026000.014000.017000.021000.014000.018000.019000.0
Percentage of ShortTermLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan


Stock
Period End2021-06-30
Value970000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-30
Value970000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302015-12-31
Value2742000.06479000.02959000.01516000.01237000.03951000.02207000.0762000.03405000.069000.01593000.01537000.01198000.05630000.0148000.0241000.0189000.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302015-12-31
Value2742000.06479000.02959000.01516000.01237000.03951000.02207000.0762000.03405000.069000.01593000.01537000.01198000.05630000.0148000.0241000.0189000.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:VariableLeaseCost

us-gaap:VariableLeaseCost


Variable
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1578000.0710000.01252000.01702000.01260000.01371000.01893000.01967000.01045000.0896000.0
Percentage of VariableLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:EntityCommonStockSharesOutstanding

dei:EntityCommonStockSharesOutstanding


Entity
Period End2021-07-282021-04-262021-02-172020-10-26
Value1.5e-05152146146
Percentage of EntityCommonStockSharesOutstanding100.0100.0100.0100.0

iova:AshCashEquivalentsAndShortTermInvestmentsAndRestrictedCashTotal

iova:AshCashEquivalentsAndShortTermInvestmentsAndRestrictedCashTotal


Ash
Period End2021-06-302021-03-312020-12-312020-09-30
Value7081316768
Percentage of AshCashEquivalentsAndShortTermInvestmentsAndRestrictedCashTotal100.0100.0100.0100.0

iova:AvailableForSaleDebtSecuritiesMaturityRollingAfterOneThroughTwoYearsAmortizedCost

iova:AvailableForSaleDebtSecuritiesMaturityRollingAfterOneThroughTwoYearsAmortizedCost


Available
Period End2021-06-302021-03-31
Value4610
Percentage of AvailableForSaleDebtSecuritiesMaturityRollingAfterOneThroughTwoYearsAmortizedCost100.0100.0

iova:AvailableForSaleDebtSecuritiesMaturityRollingAfterOneThroughTwoYearsFairValue

iova:AvailableForSaleDebtSecuritiesMaturityRollingAfterOneThroughTwoYearsFairValue


Available
Period End2021-06-302021-03-31
Value4610
Percentage of AvailableForSaleDebtSecuritiesMaturityRollingAfterOneThroughTwoYearsFairValue100.0100.0

iova:AvailableForSaleSecuritiesAccumulatedAccretion

iova:AvailableForSaleSecuritiesAccumulatedAccretion


Available
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-1861000.0-446000.0105000.029000.0471000.01006000.01830000.01946000.01141000.0
Percentage of AvailableForSaleSecuritiesAccumulatedAccretion100.0100.0100.0100.0100.0100.0100.0100.0100.0

iova:AvailableForSaleSecuritiesAccumulatedAccretion us-gaap:FinancialInstrument

us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Available
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value-267000.0-124000.029000.045000.0107000.0476000.0907000.0328000.0
Percentage of AvailableForSaleSecuritiesAccumulatedAccretion14.327.827.6155.222.747.349.628.7

us-gaap:USTreasurySecurities


Available
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value-1594000.0-322000.0-134000.0-16000.0364000.0530000.0923000.0813000.0
Percentage of AvailableForSaleSecuritiesAccumulatedAccretion85.772.2-127.6-55.277.352.750.471.3

iova:CashEquivalentsAndInvestments

iova:CashEquivalentsAndInvestments


Cash
Period End2021-06-302020-12-31
Value682611
Percentage of CashEquivalentsAndInvestments100.0100.0

iova:ClinicalRelatedExpensesCurrent

iova:ClinicalRelatedExpensesCurrent


Clinical
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value1312151021104.6925.8214.4462.563.4244.0293.924.0313.310.7351.0660.614
Percentage of ClinicalRelatedExpensesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

iova:CommercialManufacturingFacilityRelatedCurrent

iova:CommercialManufacturingFacilityRelatedCurrent


Commercial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1703000.08153000.04342000.07693000.03408000.01869000.017000.0
Percentage of CommercialManufacturingFacilityRelatedCurrent100.0100.0100.0100.0100.0100.0100.0

iova:DebtInstrumentAmountThatWillBeForgivenByLenderPerFullTimeOrFullTimeEquivalentEmployee us-gaap:DebtInstrument

iova:DebtInstrumentAmountThatWillBeForgivenByLenderPerFullTimeOrFullTimeEquivalentEmployee

iova:JobCreationLoan


Debt
Period End2021-01-26
Value2000.0
Percentage of DebtInstrumentAmountThatWillBeForgivenByLenderPerFullTimeOrFullTimeEquivalentEmployee100.0

iova:DebtInstrumentLoanForgivenPerFullTimeEmployeeAmount us-gaap:DebtInstrument, us-gaap:SubsequentEventType

iova:DebtInstrumentLoanForgivenPerFullTimeEmployeeAmount

iova:JobCreationLoan, us-gaap:SubsequentEvent


Debt
Period End2021-01-26
Value2000.0
Percentage of DebtInstrumentLoanForgivenPerFullTimeEmployeeAmount100.0

iova:DeferredTaxAssetsDepreciationAndAmortization

iova:DeferredTaxAssetsDepreciationAndAmortization


Deferred
Period End2020-12-312019-12-31
Value250000.098000.0
Percentage of DeferredTaxAssetsDepreciationAndAmortization100.0100.0

iova:DeferredTaxAssetsLeaseLiabilities

iova:DeferredTaxAssetsLeaseLiabilities


Deferred
Period End2020-12-312019-12-31
Value112.529
Percentage of DeferredTaxAssetsLeaseLiabilities100.0100.0

iova:DeferredTaxLiabilitiesDepreciationAndAmortization

iova:DeferredTaxLiabilitiesDepreciationAndAmortization


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value112.3520.0530.0750.378
Percentage of DeferredTaxLiabilitiesDepreciationAndAmortization100.0100.0100.0100.0100.0

iova:LegalAndRelatedServicesCurrent

iova:LegalAndRelatedServicesCurrent


Legal
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value998000.0963000.01061000.01534000.01465000.01100000.0866000.01395000.0790000.01033000.0825000.0498000.0552000.0926000.0935000.01236000.0898000.0927000.0
Percentage of LegalAndRelatedServicesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

iova:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour

iova:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour


Lessee
Period End2021-06-302021-03-312020-09-30
Value74740.115
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour100.0100.0100.0

iova:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour us-gaap:LeaseContractualTerm

iova:FacilityLeases


Lessee
Period End2021-06-302021-03-312020-09-30
Value74740.115
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour100.0100.0100.0

iova:LesseeOperatingLeaseLiabilityToBePaidExcludingOneTimeOptionToExtendLeasePayments us-gaap:StatementGeographical, us-gaap:LeaseContractualTerm, us-gaap:PropertyPlantAndEquipmentByType

iova:LesseeOperatingLeaseLiabilityToBePaidExcludingOneTimeOptionToExtendLeasePayments

iova:SanCarlosCalifornia, iova:NewHeadquartersLease, iova:OfficeSpace


Lessee
Period End2021-02-08
Value36
Percentage of LesseeOperatingLeaseLiabilityToBePaidExcludingOneTimeOptionToExtendLeasePayments100.0

iova:ManufacturingRelatedExpensesCurrent

iova:ManufacturingRelatedExpensesCurrent


Manufacturing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value6402000.04169000.03266000.02319000.03479000.03527000.02184000.02365000.03410000.01789000.02684000.02442000.01150000.0626000.0876000.01352000.01004000.0437000.0
Percentage of ManufacturingRelatedExpensesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

iova:OperatingLossCarryForwardsHavingDefiniteExpireLifeValue

iova:OperatingLossCarryForwardsHavingDefiniteExpireLifeValue


Operating
Period End2020-12-31
Value142
Percentage of OperatingLossCarryForwardsHavingDefiniteExpireLifeValue100.0

iova:OperatingLossCarryForwardsHavingIndefiniteExpireLifeValue

iova:OperatingLossCarryForwardsHavingIndefiniteExpireLifeValue


Operating
Period End2020-12-31
Value520
Percentage of OperatingLossCarryForwardsHavingIndefiniteExpireLifeValue100.0

iova:SalesAgreementAuthorizedSharesToBeIssuedAmount us-gaap:SubsidiarySaleOfStock

iova:SalesAgreementAuthorizedSharesToBeIssuedAmount

iova:AtMarketOfferingProgram


Sales
Period End2021-02-08
Value350
Percentage of SalesAgreementAuthorizedSharesToBeIssuedAmount100.0

iova:SecurityDepositForBenefitOfUtilitiesServiceProvider

iova:SecurityDepositForBenefitOfUtilitiesServiceProvider


Security
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.0746850.0746850.0746850.0746850.07468574
Percentage of SecurityDepositForBenefitOfUtilitiesServiceProvider100.0100.0100.0100.0100.0100.0

us-gaap:AccruedEmployeeBenefitsCurrent

us-gaap:AccruedEmployeeBenefitsCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value107.9029.0327.8667.1144.1186.8665.223.9442.2254.1132.8972.6131.6552.6131.5561.6251.0541.5810.031
Percentage of AccruedEmployeeBenefitsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AreaOfLand us-gaap:StatementGeographical

us-gaap:AreaOfLand

iova:PhiladelphiaPennsylvania


Area
Period End2020-08-01
Value2965.0
Percentage of AreaOfLand100.0

us-gaap:AreaOfLand us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Area
Period End2020-08-012019-07-022019-05-022018-10-192016-08-04
Value2965.04500.01500.012322.08733.0
Percentage of AreaOfLand100.00.00.00.00.0

us-gaap:AssetsFairValueDisclosure

us-gaap:AssetsFairValueDisclosure


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-302017-03-312016-12-312015-12-31
Value6824725626456111932933223273853681793014405970
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-06-302017-03-312016-12-312015-12-31
Value360380562645611193293322327385386179300.00.00.00.0
Percentage of AssetsFairValueDisclosure52.880.5100.0100.0100.0100.0100.0100.0100.0100.0104.9100.0100.00.00.00.00.0

us-gaap:FairValueInputsLevel2


Assets
Period End2021-06-302021-03-312020-12-312019-12-312019-03-312018-12-312018-09-302018-06-302017-06-302017-03-312016-12-312015-12-31
Value322910.00.00.00.00.00.014405970
Percentage of AssetsFairValueDisclosure47.219.50.00.00.00.00.00.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312019-12-312018-12-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value5622933860.00.00.00.00.00.019207.476855
Percentage of AssetsFairValueDisclosure100.0100.0104.90.00.00.00.00.00.028.40.00.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Assets
Period End2020-12-312019-12-312018-12-31
Value9150120
Percentage of AssetsFairValueDisclosure16.417.432.8

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:USTreasurySecurities


Assets
Period End2020-12-312019-12-312018-12-31
Value470242265
Percentage of AssetsFairValueDisclosure83.682.672.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel1, us-gaap:MoneyMarketFunds


Assets
Period End2021-06-302020-12-31
Value4649
Percentage of AssetsFairValueDisclosure6.98.8

us-gaap:FairValueInputsLevel1, us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Assets
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value91224270315093139120
Percentage of AssetsFairValueDisclosure16.434.844.316.417.429.042.632.8

us-gaap:FairValueInputsLevel1, us-gaap:USTreasurySecurities


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value31338047042134016124222918726514918
Percentage of AssetsFairValueDisclosure45.980.583.665.255.783.682.671.057.472.083.562.8

us-gaap:FairValueInputsLevel2, iova:CorporateSecurities


Assets
Period End2021-06-30
Value34
Percentage of AssetsFairValueDisclosure5.0

us-gaap:FairValueInputsLevel2, us-gaap:CommercialPaper


Assets
Period End2021-06-302021-03-31
Value27729
Percentage of AssetsFairValueDisclosure40.66.3

us-gaap:FairValueInputsLevel2, us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Assets
Period End2021-06-302021-03-31
Value1162
Percentage of AssetsFairValueDisclosure1.613.1

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Assets
Period End2020-12-312019-12-312018-12-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value562293386132129867060909999
Percentage of AssetsFairValueDisclosure100.0100.0104.989.854.148.80.00.00.0128.40.00.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Assets
Period End2020-12-312019-12-312018-12-31
Value9150120
Percentage of AssetsFairValueDisclosure16.417.432.8

us-gaap:FairValueMeasurementsRecurring, us-gaap:USTreasurySecurities


Assets
Period End2020-12-312019-12-312018-12-31
Value470242265
Percentage of AssetsFairValueDisclosure83.682.672.0

us-gaap:AssetsFairValueDisclosure us-gaap:FinancialInstrument

iova:CorporateSecurities


Assets
Period End2021-06-30
Value34
Percentage of AssetsFairValueDisclosure5.0

us-gaap:CommercialPaper


Assets
Period End2021-06-302021-03-31
Value27729
Percentage of AssetsFairValueDisclosure40.66.3

us-gaap:MoneyMarketFunds


Assets
Period End2021-06-302020-12-31
Value4649
Percentage of AssetsFairValueDisclosure6.98.8

us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value116291224270315093139120
Percentage of AssetsFairValueDisclosure1.613.116.434.844.316.417.429.042.632.8

us-gaap:USTreasurySecurities


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value31338047042134016124222918726514918
Percentage of AssetsFairValueDisclosure45.980.583.665.255.783.682.671.057.472.083.562.8

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value73000.0101000.050000.0155000.0223000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:FinancialInstrument

us-gaap:CommercialPaper


Available
Period End2021-06-30
Value44000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax60.3

us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value1000.016000.020000.050000.044000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax1.415.840.032.319.7

us-gaap:USTreasurySecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value28000.085000.030000.0105000.0179000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax38.484.260.067.780.3

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax


Available
Period End2021-06-302021-03-312020-12-312019-12-31
Value40000.05000.031000.03000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax us-gaap:FinancialInstrument

us-gaap:CommercialPaper


Available
Period End2021-06-302021-03-31
Value8000.04000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax20.080.0

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-30
Value10000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax25.0

us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Available
Period End2020-12-31
Value2000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax6.5

us-gaap:USTreasurySecurities


Available
Period End2021-06-302021-03-312020-12-312019-12-31
Value22000.01000.029000.03000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax55.020.093.5100.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value619472563646292
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:FinancialInstrument

us-gaap:CommercialPaper


Available
Period End2021-06-302021-03-31
Value26729
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis43.26.3

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-30
Value27
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis4.4

us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value11629222450
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis1.813.116.434.817.3

us-gaap:USTreasurySecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value313380471421241
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis50.680.583.665.282.7

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis


Available
Period End2021-06-302021-03-31
Value573461
Percentage of AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue


Available
Period End2021-06-302021-03-31
Value573461
Percentage of AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate


Available
Period End2021-06-302021-03-31
Value619472
Percentage of AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis


Available
Period End2021-06-302021-03-31
Value619472
Percentage of AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:AvailableForSaleSecuritiesDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value619472562645293
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FinancialInstrument

us-gaap:CommercialPaper


Available
Period End2021-06-302021-03-31
Value26729
Percentage of AvailableForSaleSecuritiesDebtSecurities43.26.3

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-30
Value27
Percentage of AvailableForSaleSecuritiesDebtSecurities4.4

us-gaap:USGovernmentCorporationsAndAgenciesSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value11629122450
Percentage of AvailableForSaleSecuritiesDebtSecurities1.813.116.434.817.4

us-gaap:USTreasurySecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value313380470421242
Percentage of AvailableForSaleSecuritiesDebtSecurities50.680.583.665.282.6

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent


Available
Period End2021-06-302021-03-312020-12-31
Value573461562
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent


Available
Period End2021-06-302021-03-31
Value4610
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent100.0100.0

us-gaap:CashCashEquivalentsAndShortTermInvestments

us-gaap:CashCashEquivalentsAndShortTermInvestments


Cash
Period End2021-03-312020-12-312020-09-302019-03-312018-12-312018-09-302018-06-302017-12-312016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value610635719385386179300.01919910311011244
Percentage of CashCashEquivalentsAndShortTermInvestments100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:CashEquivalentsAtCarryingValue

us-gaap:CashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-09-302018-06-302017-12-31
Value637449511513910267991
Percentage of CashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashEquivalentsAtCarryingValue us-gaap:CashAndCashEquivalents

us-gaap:DemandDeposits


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-09-302018-06-302017-12-31
Value195717179.5123.95416654
Percentage of CashEquivalentsAtCarryingValue31.277.335.433.46.331.638.8206.6207.859.3

us-gaap:MoneyMarketFunds


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-09-302018-06-302017-12-31
Value63744951943910126891
Percentage of CashEquivalentsAtCarryingValue100.0100.0100.0100.062.3100.0100.046.986.3100.0

us-gaap:DebtInstrumentFaceAmount us-gaap:DebtInstrument

us-gaap:DebtInstrumentFaceAmount

iova:JobCreationLoan


Debt
Period End2021-01-26
Value1000000.0
Percentage of DebtInstrumentFaceAmount100.0

us-gaap:DebtInstrumentFaceAmount us-gaap:DebtInstrument, us-gaap:SubsequentEventType

iova:JobCreationLoan, us-gaap:SubsequentEvent


Debt
Period End2021-01-26
Value1000000.0
Percentage of DebtInstrumentFaceAmount100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value20113178474119
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value14495563323158.4281563.6790226.957129
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value3222149.3238.1673.736
Percentage of DeferredTaxAssetsTaxCreditCarryforwards100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value118.8515.8234.5689.5624.064
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value1866000.01410000.01049000.0733000.0139000.0146000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EmployeeStockOption


Employee
Period End2021-06-302021-03-312020-12-312020-09-30
Value1181487578
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions

us-gaap:RestrictedStockUnitsRSU


Employee
Period End2021-06-30
Value28
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions us-gaap:PlanName

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions

iova:TwoThousandTwentyEspp


Employee
Period End2021-06-302021-03-312020-12-31
Value0.30.20.5
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value4.7754.775106.642
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths us-gaap:LeaseContractualTerm

iova:CmoEmbeddedLeases


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value0.3610.3616.2885.675
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths7.67.661.685.4

iova:FacilityLeases


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value4.4144.4143.9120.967
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths92.492.438.414.6

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2021-06-302021-03-312020-09-302019-09-302019-06-302018-12-31
Value5418000.08105000.02201000.04316000.06461000.06461.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear us-gaap:LeaseContractualTerm

iova:CmoEmbeddedLeases


Lessee
Period End2021-06-302021-03-312020-09-30
Value2334000.03879000.01813000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear43.147.982.4

iova:FacilityLeases


Lessee
Period End2021-06-302021-03-312020-09-30
Value3084000.04226000.0388000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear56.952.117.6

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value7.57.48.37.50.0757.57.77.90.082
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwards

us-gaap:DomesticCountry


Operating
Period End2020-12-312019-12-312018-12-312017-12-31
Value662426251143
Percentage of OperatingLossCarryforwards100.0100.0100.0100.0

us-gaap:StateAndLocalJurisdiction


Operating
Period End2020-12-312019-12-312018-12-312017-12-31
Value1281288866
Percentage of OperatingLossCarryforwards19.530.135.346.3

us-gaap:PreferredStockLiquidationPreferenceValue us-gaap:StatementClassOfStock

us-gaap:PreferredStockLiquidationPreferenceValue

us-gaap:SeriesBPreferredStock


Preferred
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-06-302018-12-31
Value17171717172727
Percentage of PreferredStockLiquidationPreferenceValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockValue us-gaap:StatementClassOfStock

us-gaap:PreferredStockValue

us-gaap:SeriesBPreferredStock


Preferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value3000.03000.04000.04000.04000.04000.04000.04000.06000.06000.06000.06000.06000.07000.07000.08000.08000.08000.08000.08000.011000.00
Percentage of PreferredStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:PrepaidExpenseAndOtherAssets us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:PrepaidExpenseAndOtherAssets

us-gaap:AccountingStandardsUpdate201815


Prepaid
Period End2020-12-312020-09-30
Value1400000.0800000.0
Percentage of PrepaidExpenseAndOtherAssets100.0100.0

us-gaap:RestrictedCash

us-gaap:RestrictedCash


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value6084000.06084000.05525000.05525000.05525000.05525000.05450000.05450000.05450000.0
Percentage of RestrictedCash100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SecurityDeposit

us-gaap:SecurityDeposit


Security
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-30
Value1450000.01450000.05500000.05500000.05500000.05500000.05500000.05500000.0
Percentage of SecurityDeposit100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SecurityDeposit us-gaap:Range

srt:Minimum


Security
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1450000.01450000.01450000.01500000.01450000.01450000.0
Percentage of SecurityDeposit0.026.426.427.326.426.4

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-30
Value23.87
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

iova:TwentyEighteenEquityIncentivePlan


Share
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value7.4555377.9721590.3362223.29763.64464.02954.18396.06.06.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

iova:TwoThousandElevenEquityIncentivePlan


Share
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-312017-12-31
Value0.011240.011240.151240.151240.151240.151240.376240.376240.542490.542490.725267
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant0.20.145.04.64.13.89.06.39.00.00.0

iova:TwoThousandFourteenEquityIncentivePlan


Share
Period End2020-12-312020-06-302020-03-31
Value0.0615750.0059620.089408
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant0.80.126.6

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value6.4014434.5489593.118912.7692052.496695
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

iova:RangeOfExercisePricesFive


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value1.28290.088750.5027080.401273
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber20.02.016.114.5

iova:RangeOfExercisePricesFour


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.8128870.2486890.5225960.43437
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber12.75.516.815.7

iova:RangeOfExercisePricesNine


Share
Period End2020-12-312018-12-31
Value0.0767870.007
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber1.20.2

iova:RangeOfExercisePricesOne


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value1.3071330.9450480.7433760.39
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber20.420.823.814.1

iova:RangeOfExercisePricesSeven


Share
Period End2020-12-312019-12-312018-12-31
Value0.0123750.7197380.08125
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber0.215.82.6

iova:RangeOfExercisePricesSix


Share
Period End2020-12-312018-12-312017-12-31
Value0.6746720.123750.79806
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber10.54.028.8

iova:RangeOfExercisePricesTen


Share
Period End2020-12-312019-12-312018-12-31
Value0.125550.0090.002
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber2.00.20.1

iova:RangeOfExercisePricesThree


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.8082280.8300550.6628320.32379
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber12.618.221.311.7

iova:RangeOfExercisePricesTwo


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value1.3009111.3290980.4733980.421712
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber20.329.215.215.2

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice


Share
Period End2021-03-312020-12-312019-12-312018-12-312017-12-312016-12-31
Value13.4911.79.617.887.967.35
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice us-gaap:OptionIndexedToIssuersEquityType

us-gaap:EmployeeStockOption


Share
Period End2021-06-302020-09-302019-12-312018-12-312017-12-312016-12-312015-12-31
Value14.3511.089.617.887.967.358.38
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice0.00.0100.0100.0100.0100.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRange

iova:RangeOfExercisePricesFive


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value15.7111.059.17.81
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice134.3115.0115.598.1

iova:RangeOfExercisePricesFour


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value11.269.447.847.54
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice96.298.299.594.7

iova:RangeOfExercisePricesNine


Share
Period End2020-12-312018-12-31
Value25.6594.01
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice219.21193.0

iova:RangeOfExercisePricesOne


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value5.985.565.565.43
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice51.157.970.668.2

iova:RangeOfExercisePricesSeven


Share
Period End2020-12-312019-12-312018-12-31
Value23.1715.2315.26
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice198.0158.5193.7

iova:RangeOfExercisePricesSix


Share
Period End2020-12-312018-12-312017-12-31
Value19.5911.0510.9
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice167.4140.2136.9

iova:RangeOfExercisePricesTen


Share
Period End2020-12-312019-12-312018-12-31
Value36.5499.12117.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice312.31031.41484.8

iova:RangeOfExercisePricesThree


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value9.548.457.556.94
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice81.587.995.887.2

iova:RangeOfExercisePricesTwo


Share
Period End2020-12-312019-12-312018-12-312017-12-31
Value7.677.286.946.08
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice65.675.888.176.4

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue


Share
Period End2021-03-312020-12-312017-12-312016-12-31
Value1342222.4571.839
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue us-gaap:OptionIndexedToIssuersEquityType

us-gaap:EmployeeStockOption


Share
Period End2021-06-302020-09-302017-12-312016-12-312015-12-31
Value941342.4571.8391.487
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue0.00.0100.0100.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue


Share
Period End2021-03-312020-12-312017-12-312016-12-312014-03-312013-12-312010-12-31
Value1693586.1993.7191.9343731.1760631.401563
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue us-gaap:OptionIndexedToIssuersEquityType

us-gaap:EmployeeStockOption


Share
Period End2021-06-302020-09-302019-12-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-312012-12-31
Value1042031497.1863.7198.067.6880.1852.3472.8741.1760.217
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue0.00.00.0115.9100.00.00.00.00.00.0100.00.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested us-gaap:AwardType

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested

us-gaap:RestrictedStockUnitsRSU


Sharebased
Period End2021-06-30
Value32
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested100.0

us-gaap:SharesIssuedPricePerShare us-gaap:Range, us-gaap:SubsidiarySaleOfStock

us-gaap:SharesIssuedPricePerShare

srt:WeightedAverage, iova:AtMarketOfferingProgram


Shares
Period End2021-03-31
Value34.67
Percentage of SharesIssuedPricePerShare100.0

Line plots across dimensions of each concept


us-gaap:SharesOutstanding
us-gaap:StatementClassOfStock
(None,)
Shares Outstandingus-gaap: Statement Class Of Stock
TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:ResearchAndDevelopmentExpense
us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased
(None,)
Research And Development Expenseus-gaap: Long Term Purchase Commitment By Category Of Item Purchased
us-gaap:ResearchAndDevelopmentExpense
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
(None,)
Research And Development Expenseus-gaap: Finite Lived Intangible Assets By Major Class
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:ShortTermInvestments
us-gaap:FinancialInstrument
(None,)
Short Term Investmentsus-gaap: Financial Instrument
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)
Property Plant And Equipment Grossus-gaap: Property Plant And Equipment By Type
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
us-gaap:LeaseContractualTerm
(None,)
Lessee Operating Lease Liability Payments Due Year Twous-gaap: Lease Contractual Term
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents
(None,)
Stock Issued During Period Value New Issuesus-gaap: Statement Equity Components