BCRX


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

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesAuthorized

us-gaap:PreferredStockSharesAuthorized

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardDate, us-gaap:AwardType, us-gaap:PlanName
us-gaap:PlanName

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostsAndExpenses

us-gaap:InterestExpense

us-gaap:InterestExpenseDebt

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:OperatingIncomeLoss

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:ResearchAndDevelopmentExpense

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:CounterpartyName, us-gaap:ProductOrService
us-gaap:CounterpartyName, us-gaap:StatementScenario
us-gaap:ProductOrService

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:Assets

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:AccountsReceivableNetCurrent

us-gaap:ReceivablesNetCurrent
us-gaap:AccountsNotesLoansAndFinancingReceivablesByBillingStatusType
us-gaap:AccountsNotesLoansAndFinancingReceivablesByBillingStatusType, us-gaap:AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyType
us-gaap:AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyType

us-gaap:InventoryNet

us-gaap:InventoryFinishedGoods

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:BalanceSheetLocation
us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:LiabilitiesCurrent

us-gaap:NotesPayableCurrent
us-gaap:BalanceSheetLocation
us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:TaxesPayableCurrent

us-gaap:LongTermDebt
us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility

us-gaap:LongTermDebtNoncurrent
us-gaap:BalanceSheetLocation
us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
us-gaap:BalanceSheetLocation
us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:AmortizationOfFinancingCosts

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInInventories

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:NetCashProvidedByUsedInFinancingActivities
us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType
us-gaap:ProceedsFromIssuanceOfLongTermDebt
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

bcrx:AmortizationOfDebtFinancingCostsAndOriginalIssueDiscounts

bcrx:AmortizationOfDiscountAndPremiumOnInvestments
us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType
bcrx:CollaborativeAgreementContractCovenantMaximumAmountOfFunding
us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType
bcrx:CollaborativeAgreementContractValue
us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility
bcrx:DebtInstrumentPrepaymentFeePercentageOfAccruedInterest
us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility
bcrx:DebtInstrumentPrepaymentFeePercentageOfPrincipalVoluntaryPayments
us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType
bcrx:ExpectedReceivableFromAwardsForResearchAndDevelopmentContracts

bcrx:IncreaseDecreaseInAmortizationOfDebtIssuanceCosts

bcrx:InterestAndOtherIncomeLoss

bcrx:NonCashInterestExpenseOnRoyaltyFinancingObligation
us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility
bcrx:PaidinkindInterestOnSecuredTermLoan
us-gaap:PlanName
bcrx:PercentageOfCommonStockSharesBeginning
us-gaap:PlanName
bcrx:PercentageOfCommonStockSharesEnding
us-gaap:PlanName
bcrx:PercentageOfSalaryToPurchaseCommonStockMaximum
us-gaap:TypeOfArrangement
bcrx:ProceedsFromAwardsForResearchAndDevelopmentContracts

bcrx:ProceedsFromRealizedGainOnInvestments
us-gaap:CounterpartyName, us-gaap:ProductOrService, us-gaap:StatementScenario
bcrx:RevenueFromContractWithCustomerConditionalMilestonePayment

bcrx:RoyaltyExpenseReversalOfExpense
us-gaap:CounterpartyName, us-gaap:LongtermDebtType
bcrx:RoyaltyFinancingObligationInterestAccretion
us-gaap:CounterpartyName, us-gaap:ProductOrService, us-gaap:StatementScenario
bcrx:RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInKeyTerritories
us-gaap:CounterpartyName, us-gaap:ProductOrService, us-gaap:StatementScenario
bcrx:RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInOtherMarkets
us-gaap:CounterpartyName, us-gaap:ProductOrService
bcrx:RoyaltyPurchaseAgreementRoyaltiesPercentageOfGlobalAnnualNetSales
us-gaap:CounterpartyName, us-gaap:ProductOrService
bcrx:RoyaltyPurchaseAgreementRoyaltiesPercentageOfSublicenseRevenueInOtherMarkets
us-gaap:PlanName
bcrx:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodAwardsAvailable
us-gaap:PlanName
bcrx:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsForfeituresInPeriodAwardsAvailable

us-gaap:AdvertisingExpense
us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility, us-gaap:VariableRate
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility, us-gaap:VariableRate
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeGainOnDerivative
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeLossOnDerivative
us-gaap:CreditFacility, us-gaap:LineOfCreditFacility
us-gaap:ExtinguishmentOfDebtAmount

us-gaap:GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
us-gaap:LitigationCase, us-gaap:IncomeStatementLocation
us-gaap:GainLossRelatedToLitigationSettlement

us-gaap:IncreaseDecreaseInContractWithCustomerLiability

us-gaap:IncreaseDecreaseInDerivativeAssets

us-gaap:IncreaseDecreaseInInterestPayableNet

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInReceivables

us-gaap:OperatingLeaseExpense

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:PaidInKindInterest
us-gaap:CreditFacility, us-gaap:LineOfCreditFacility
us-gaap:PaymentsOfDebtExtinguishmentCosts

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt
us-gaap:CounterpartyName
us-gaap:ProceedsFromCollaborators

us-gaap:ProceedsFromIssuanceOfCommonStock
us-gaap:CounterpartyName, us-gaap:LongtermDebtType
us-gaap:ProceedsFromIssuanceOfDebt

us-gaap:ProceedsFromIssuanceOfWarrants

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax

us-gaap:RepaymentsOfLinesOfCredit
us-gaap:CreditFacility, us-gaap:LineOfCreditFacility

us-gaap:RoyaltyExpense
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
us-gaap:AwardDate, us-gaap:AwardType, us-gaap:PlanName, us-gaap:Vesting
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
us-gaap:AwardType, us-gaap:PlanName, us-gaap:Vesting
us-gaap:PlanName, us-gaap:Vesting

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
us-gaap:PlanName
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised
us-gaap:PlanName
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
us-gaap:StatementEquityComponents
us-gaap:CreditFacility, us-gaap:LineOfCreditFacility
us-gaap:WriteOffOfDeferredDebtIssuanceCost

bcrx:AccruedDevelopmentCosts

bcrx:AccruedInventoryExpense

bcrx:AvailableForSaleDebtSecuritiesAccruedInterest
us-gaap:FinancialInstrument

bcrx:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughTwoYearsFairValue
us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility
bcrx:DebtInstrumentCommitmentFeePercentage
us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility
bcrx:DebtInstrumentCovenantMinimumUnrestrictedCashAndCashEquivalents
us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility
bcrx:DebtInstrumentExitFeePercentageOfPrincipal
us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility
bcrx:DebtInstrumentLiborCap
us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility
bcrx:DebtInstrumentLiborFloor

bcrx:DeferredTaxAssetsLeasingObligations

bcrx:DeferredTaxAssetsRoyaltyIncome

bcrx:DeferredTaxLiabilitiesRightOfUseAssets

bcrx:EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedForRemainderOfFiscalYear

bcrx:EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearFour

bcrx:EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearThree

bcrx:EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearTwo

bcrx:EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedNextYear

bcrx:FutureRoyaltiesPayable
us-gaap:CounterpartyName

bcrx:LesseeOperatingLeaseLiabilityToBePaidAfterYearFour
us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility
bcrx:LongTermDebtIncludingPaidInKindInterest

bcrx:OperatingLeaseRightofuseAssetAccumulatedAmortization
us-gaap:AccountsNotesLoansAndFinancingReceivablesByBillingStatusType, us-gaap:AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyType
bcrx:ReceivablesPayablesNetCurrent
us-gaap:AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyType
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AccountsReceivableNet
us-gaap:ProductOrService, us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:AccruedProfessionalFeesCurrent
us-gaap:CounterpartyName
us-gaap:AccruedRoyaltiesCurrentAndNoncurrent

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
us-gaap:DerivativeInstrumentRisk
us-gaap:CollateralAlreadyPostedAggregateFairValue
us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility
us-gaap:DebtInstrumentFaceAmount
us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType
us-gaap:CounterpartyName, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentInterestRateEffectivePercentage
us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility
us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
us-gaap:CounterpartyName, us-gaap:LongtermDebtType
us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredRevenueCurrent

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsDomestic

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsResearch

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:InterestPayableCurrent
dei:LegalEntity, us-gaap:DebtInstrument
us-gaap:InterestPayableCurrentAndNoncurrent
us-gaap:CounterpartyName, us-gaap:LongtermDebtType

us-gaap:InventoryGross

us-gaap:InventoryRawMaterials

us-gaap:InventoryRawMaterialsNetOfReserves

us-gaap:InventoryValuationReserves

us-gaap:InventoryWorkInProcess

us-gaap:InventoryWorkInProcessNetOfReserves

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LineOfCredit
us-gaap:CreditFacility, us-gaap:LineOfCreditFacility
us-gaap:CreditFacility, us-gaap:LineOfCreditFacility
us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd

us-gaap:LinesOfCreditCurrent

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear

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

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue
us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalents
us-gaap:CounterpartyName
us-gaap:RevenueRemainingPerformanceObligation
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
us-gaap:PlanName
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares

Plots across concepts


IncomeStatement
Comprehensive Income Net Of Tax
Balance Sheet
Stockholders Equity
Assets
Property Plant And Equipment Net
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 Current
Current Liabilities
Taxes Payable Current
Stockholders Equity
Retained Earnings Accumulated Deficit
CashFlow
Net Income Loss
NetCashProvidedByUsedInOperatingActivities
Net Income Loss
Shares
Weighted Average Number Of Diluted Shares Outstanding
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
InventoryNet
Inventory Raw Materials Net Of Reserves

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:CommonStockValue █████▇▇▄▄▄▄▄▄▄▄▄▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁1.7871.7771.7691.7661.7641.5421.5411.1041.1041.1031.1011.0960.9890.9870.9840.9840.8040.8040.7380.7380.7370.7370.7340.7330.7320.7250.720.7190.7170.6010.5910.5910.5420.5140.5090.5090.5010.4920.4570.4520.451NA0.449NANA
us-gaap:CommonStockSharesIssued █████▇▇▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▁▁178.725177.67176.883176.566176.429154.192154.082110.438110.37110.27110.063109.62598.92898.70298.41198.38980.42880.38173.78273.75873.70173.69373.35573.33773.16872.47471.95571.86171.71860.06559.09259.09154.19751.40550.89350.8850.12949.15545.6620.0451950.04515NA0.044959NANA
us-gaap:CommonStockSharesAuthorized █████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁450.0450.0450.0450.0450.0200.0200.0200.0200.0200.0200.0200.0200.0200.0200.0200.0200.0200.0200.0200.0200.0200.0200.0200.0200.0200.0200.0NANA95.095.095.095.095.095.095.095.095.095.00.0950.095NA0.095NANA
us-gaap:PreferredStockSharesAuthorized ██████▁██▁█████████████████████████████▁▁5.05.05.05.05.05.00.0055.05.00.0055.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.00.0050.005NA0.005NANA
us-gaap:CommonStockSharesOutstanding █████▇▇▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▁▁178.725177.67176.883176.566176.429154.192154.082110.438110.37110.27110.063109.62598.92898.70298.41198.38980.42880.38173.78273.75873.70173.69373.35573.33773.16872.47471.95571.86171.71860.06559.09259.09154.19751.40550.89350.8850.12949.15545.6620.0451950.04515NA0.044959NANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding NA177.343NA176.521161.569154.156NA110.416110.338110.167NA105.4198.78798.592NA83.5780.41875.167NA73.73473.69573.601NA73.26276.7672.341NA71.80163.647NANANANANANANANANANANANANANANANA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount NANANA16.5440.01400712.196NA0.0005410.0019273.406NA2.4751.9391.775NA1.9962.2082.762NA1.2910.8851.33NA3.821NA3.458NA5.6025.0385.206NA2.7830.9787.051NA1.2071.0935.994NANANANANANANA
us-gaap:EarningsPerShareBasicAndDiluted -240.0NANANA-0.24-0.24-0.02-0.34-0.34-0.28-0.25-0.28-0.19-0.26-0.2-0.18-0.21-0.19-0.06-0.16-0.22-0.31-0.24999999999999994-0.2NA-0.21-0.16-0.12-0.23-0.17-0.09-0.14-0.23-0.09-0.22-0.19-0.25-0.13-0.29-0.32-0.36-0.29-0.22999999999999998-0.24-0.23
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AllocatedShareBasedCompensationExpense █▆▆▃▃▃▄▆▆▄▂▂▂▃▂▆▂▃▂▂▂▃▂▂▄▂▄▂▄▂▁▁7.6325.4795.8872.8733.282.7543.6885.3295.3853.3172.3242.0852.0842.9032.3145.5192.3262.4622.0091.9871.8462.6451.9321.8393.6752.2593.6271.4213.5191.610.8890.958NANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▃▁▁▃▄▄▇▄▄▄▅▅▆▅▆▆▆▆▇▆▆▅▆▆█▆▆▇▆▆▇▇▆▇▆▇▆▇▆▆▆▆-43.293-64.105-60.499-46.109-38.618-37.624-2.643-37.573-37.499-30.846-27.319-29.555-18.422-26.01-19.769-15.136-16.898-14.21-4.537-11.552-16.283-22.578-18.34-14.534.799-15.024-11.804-8.732-14.648-10.139-5.427-8.005-12.181-4.518-11.066-9.7-12.285-6.043-13.201-14.501-16.262-13.051NANANA
us-gaap:CostOfGoodsAndServicesSold ▁█▁▃▁0.2975.9230.0331.5170.0NA2.3270.00.01.399NANANANA0.01.142NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostsAndExpenses █▇▆▅▄▅▄▄▄▄▃▃▃▃▂▂▂▂▂▂▂▂▂▃▂▂▂▂▁▁▂▁▁▁▂▁▂▂▂▂▂▂▃▂▂79.54170.43656.42148.96641.38145.80139.83436.87336.36635.21727.99129.94730.74526.1921.75122.10918.61520.12217.17117.00416.91723.86821.79624.14920.521.25620.60214.84813.08510.84416.9019.31412.9638.8714.79613.77714.38617.22216.26618.05417.97816.93427.00222.9917.946
us-gaap:InterestExpense ██▄▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▂▂▁▁▁▁▁▁▁▁▁▁▁13.49512.9045.6092.9272.9183.0473.0873.0443.0352.7262.4142.3462.1952.2212.2312.142.0942.12.1311.4651.4211.471.3381.2411.3061.3151.3141.2171.2251.2421.2421.1911.1651.181.181.1661.161.161.161.161.1660.288NANANA
us-gaap:InterestExpenseDebt ██▃▂▂▂▂▂▂▂▂▂▁▁▂▁▁▁▁▁▁▁13.49512.9045.6092.9272.9183.0473.0893.0423.0352.7252.4142.3462.1952.1362.2312.142.0942.022.1311.4651.4211.338NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▃▁▁▃▄▄▇▄▄▄▅▅▆▅▆▆▆▆▇▆▆▅▆▆█▆▆▇▆▆▇▇▆▇▆▇▆▇▆▆▆▆▆▆▆-43.198-64.284-60.493-46.115-38.607-37.599-2.622-37.592-37.629-31.054-27.432-29.597-18.446-25.777-19.543-15.134-16.886-14.219-4.503-11.528-16.281-22.832-18.135-14.6214.901-15.164-11.672-8.731-14.649-10.137-5.429-8.001-12.172-4.506-11.053-9.7-12.276-6.052-13.192-14.459-16.271-13.027-10.201-10.864-10.193
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings█▁-43.198-64.284NA-46.115-38.607-37.599NA-37.592-37.629-31.054NA-29.597-18.446-25.777NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingIncomeLoss ▄▁▁▂▃▂▇▃▃▄▄▄▅▅▅▆▅▆▆▆▆▅▅▆█▆▆▆▆▆▇▇▆▇▆▆▆▇▆▆▆▆▆▆▆-29.582-51.377-52.405-42.864-38.51-40.978-0.109-35.098-34.918-29.33-25.262-28.493-18.251-22.214-17.861-13.349-15.516-10.685-8.188-9.241-12.13-19.048-17.194-13.1625.342-14.43-15.156-11.61-11.619-7.386-6.334-6.925-12.142-5.316-10.695-8.016-10.176-5.001-11.042-12.805-14.243-11.499-10.308-10.99-10.33
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▁█-0.0950.179NA0.006-0.011-0.025NA0.0190.130.208NA0.0420.024-0.233NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome▁█-0.0950.179NA0.006-0.011-0.025NA0.0190.130.208NA0.0420.024-0.233NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ResearchAndDevelopmentExpense █▆▅▅▄▄▄▄▄▄▃▃▃▃▂▃▂▂▂▂▂▃▃▃▂▂▃▂▂▁▂▁▂▁▂▂▂▂▂▂▂▂▄▃▂52.87342.43535.35430.24527.49829.86726.77425.1227.68127.49323.43122.00621.0118.44116.92417.50915.75916.7712.15814.10514.16620.57919.04720.06716.52417.1218.5113.03611.0679.18315.6147.97711.7287.41111.0912.07212.77715.44115.21114.77213.97513.40325.04919.19714.737
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax █▄▁▂▁▂▇▁▁▂▁▁▃▁▁▂▁▂▂▂▂▂▂▂▅▂▂▁▁▁▂▁▁▁▁▂▁▃▂▂▁▂▃▃▂49.95919.0594.0166.1022.8714.82339.7251.7751.4485.8872.7291.45412.4943.9763.898.763.0999.4378.9837.7634.7874.824.60210.98725.8426.8265.4463.2381.4663.45810.5672.3890.8213.5544.1015.7614.2112.2215.2245.2493.7355.43516.69412.07.616
us-gaap:SellingGeneralAndAdministrativeExpense █▇▆▅▄▅▃▄▃▂▂▃▃▂▂▁▁▁▁▁▁▁▁▁▁▁26.32522.11420.98617.19513.88315.86510.48911.7358.6596.2384.497.9239.4927.6094.6983.3432.8343.0582.5612.7562.7243.2122.7212.7313.5344.061NANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:Assets ▇▇█▄▅▃▄▂▃▃▄▄▃▄▄▅▃▃▂▂▂▂▃▃▄▃▃▃▃▁▁▁▁▁▁▂▂▂▂▂▃277.284284.431334.715176.226214.706136.589175.28290.5116.344142.338146.841168.308136.644155.372178.259191.492113.509129.51389.84791.50282.217102.881124.555138.956150.181129.867136.874137.125141.97543.38748.86653.20539.91646.89957.43964.09476.23680.08582.20892.511108.412NA109.447NANA
us-gaap:LiabilitiesAndStockholdersEquity ▇▇█▄▅▃▄▂▃▃▄▄▃▄▄▅▃▃▂▂▂▂▃▃▄▃▃▃▃▁▁▁▁▁▁▂▂▂▂▂▃277.284284.431334.715176.226214.706136.589175.28290.5116.344142.338146.841168.308136.644155.372178.259191.492113.509129.51389.84791.50282.217102.881124.555138.956150.181129.867136.874137.125141.97543.38748.86653.20539.91646.89957.43964.09476.23680.08582.20892.511108.412NA109.447NANA
us-gaap:StockholdersEquity ▁▂▄▆▇▅▆▃▄▅▆▇▆▇▇█▅▆▅▅▅▆▆▇▇▇▇▇█▄▅▅▄▄▅▅▅▅▅▅▆-106.075-74.988-19.26233.63776.5073.64838.252-41.253-9.19322.50749.23572.87346.18462.05483.767100.63224.07638.531.5783.99313.38727.79847.72464.04576.08964.37175.63583.45490.089-5.723-1.1263.41-9.047-2.84-0.4549.78415.65923.1514.80626.04239.266NA65.503NANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome▇█▆▆▆▆▆▇▇▅▃▂▁▁▃0.0870.1820.0030.0090.0030.0140.0390.060.041-0.089-0.297-0.41-0.452-0.476-0.243NANANA-0.012NANANA-0.206NANANA-0.13NANANA0.004NANANA0.027NANANA0.04NANANA0.105NANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital███▇▇▅▅▃▃▃▂▂▁▁▁1022.9751010.7791002.408994.811991.574880.319877.3795.589790.076784.278780.4776.724720.587718.037714.869NANANA566.913NANANA558.113NANANA542.943NANANA420.988NANANA391.611NANANA367.829NANANA361.52NANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:CommonStock█████▆▆▂▂▂▂▂▁▁▁1.7871.7771.7691.7661.7641.5421.5411.1041.1041.1031.1011.0960.9890.9870.984NANANA0.738NANANA0.734NANANA0.72NANANA0.591NANANA0.509NANANA0.457NANANA0.45NANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁▂▃▃▄▅▅▅▆▆▇▇▇██-1130.924-1087.726-1023.442-962.949-916.834-878.227-840.628-838.006-800.414-762.785-731.969-704.537-674.94-656.494-631.843NANANA-566.061NANANA-510.917NANANA-467.898NANANA-422.709NANANA-392.601NANANA-353.52NANANA-296.572NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AssetsCurrent ▇▇█▄▅▃▄▂▃▃▃▃▂▃▃▄▂▃▂▂▁▁▂▂▃▂▂▃▄▁▁▁▁▁▁▁▁▁▁▂▂265.802273.771323.8162.436203.837125.508164.34578.803103.719117.649114.352128.49592.669104.156125.391175.3792.263113.50266.98764.63246.11250.42565.9984.502107.08881.36689.343135.144138.2535.73142.12146.83933.5335.40741.97846.58245.06452.94952.85860.44679.877NA87.419NANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▆▇█▃▅▃▄▂▂▂▁▂▁▂▂▄▂▃▁▂▁▁▂▂▃▂▂▄▄▁▁▁▁▁▁▁▁▂▁▁▁▂▁▁▁210.314226.902272.12796.492173.468101.873114.17229.90330.7634.80426.73152.58427.10443.76750.282117.77639.69675.15822.10435.3878.66112.90228.89946.62776.78148.36754.54121.157121.51913.58421.16426.0519.76714.80520.89123.95921.92427.66116.44422.44117.00831.34213.62211.17414.021
us-gaap:AccountsReceivableNetCurrent █▅▃▂▁▂▆▁▁▂▂▁▁▂▂▃▁▃▃▂▁27.6218.3868.6465.4223.9975.64222.1463.5983.6025.0024.2933.3942.3425.6946.1178.9853.3259.5648.7685.9682.234NA6.243NANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ReceivablesNetCurrent ▃▄▃▂▂▃█▂▂▂▂▂▁▃▃▄▂▄▄▃▁▃▃▃▂▃▂▂▁▂▁▁▁▂▂▂▂▃▃▅▆6.5138.5048.2435.4223.9975.64222.1463.5983.6025.0024.2933.3942.3425.6946.1178.9853.3259.5648.7685.9682.2347.3846.2437.4954.2965.5943.8493.2380.8973.282.1152.3691.0244.3254.5623.7685.0845.8525.83111.63415.961NA30.227NANA
us-gaap:InventoryNet █▁▄▃▁9.8465.1137.0396.2415.233NA0.01.7761.00.61.6490.8210.2210.007NANA1.3050.6550.52.2321.9491.9491.612NA1.3081.210.683NANANANANANANANA0.2630.2630.2630.2630.8980.898NA0.898NANA
us-gaap:InventoryFinishedGoods ▁▁█0.5290.274.548NANANA0.276NANANANANANANANANANANANANANANANANANANA0.416NANANA3.98NANANA3.983.983.98NA3.98NANANANANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▇█▇▇▄▇▆▅▃▃▄▄▃▄▂▂▂▃▂▃▃▅▆▇▇▆█▆▇▂▃▃▂▃▂▂▁▁▁▂▁5.565.9085.5285.2413.0165.2494.4223.4472.3412.0872.392.4451.7292.3971.3811.4211.5241.7211.4382.0071.6743.2214.874.975.4494.3226.1724.5465.020.8351.7251.6561.1791.7811.0970.8260.3440.4070.3780.7950.26NA1.005NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:PropertyPlantAndEquipmentGross NANA14.449NANANA13.935NANANA15.23NANANA14.873NANANA14.839NANANA19.354NANANA14.232NANANA14.414NANANA14.932NANANA14.868NANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType bcrx:LaboratoryEquipmentNANA3.774NANANA3.462NANANA3.329NANANA2.984NANANA3.252NANANA6.004NANANA5.786NANANA5.721NANANA6.05NANANA6.033NANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:FurnitureAndFixturesNANA0.722NANANA0.602NANANA0.573NANANA0.566NANANA0.54NANANA0.718NANANA0.542NANANA0.6NANANA0.596NANANA0.596NANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LeaseholdImprovementsNANA8.583NANANA8.528NANANA8.413NANANA8.405NANANA8.294NANANA5.61NANANA5.303NANANA5.316NANANA5.316NANANA5.267NANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:OfficeEquipmentNANA0.211NANANA0.184NANANA0.152NANANA0.146NANANA0.141NANANA1.122NANANA1.115NANANA1.266NANANA1.486NANANA1.5NANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:SoftwareDevelopmentNANA1.159NANANA1.159NANANA1.125NANANA1.125NANANA1.117NANANA1.427NANANA1.423NANANA1.448NANANANANANANANANANANANANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NANA7.336NANANA6.588NANANA6.095NANANA5.327NANANA4.917NANANA14.205NANANA14.025NANANA14.108NANANA14.349NANANA13.77NANANANANANA
us-gaap:PropertyPlantAndEquipmentNet ▆▆▆▆▆▆▆▆▆▆▇▇▇▇███████▇▄▂▂▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂7.6697.0357.1137.1427.1497.277.3477.4527.5517.6449.1359.2369.399.3959.5469.6139.6029.7539.92210.09510.1128.3625.1491.1461.0470.7270.2070.210.2160.260.3060.3590.4250.4860.5830.7510.8820.9991.0981.3531.537NA1.929NANA
 us-gaap:OperatingLeaseRightOfUseAsset us-gaap:BalanceSheetLocation us-gaap:OtherNoncurrentAssets█▁█▂3.8133.6253.8023.646NANA3.593.799NA3.981NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▄▄▄▄▄▄▄▄▄▅▂▂▁▁▂▂▂▃▄▃▂▃▅▅▅▆▆▂▃▄▄▅▅▆███▇▇▆▆3.8133.6253.8023.6463.723.8113.594.2454.3335.390.9781.420.8410.2222.0271.9551.8712.2713.8132.191.612.7145.4685.2395.6996.4956.0311.2772.74.4953.625.0755.6956.0748.6949.1148.7047.7347.4337.1576.695NA0.0NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AccountsPayableCurrent ▅▆█▅▄▅▆▅▄▃▄▄▂▂▃▂▁▃▂▂▃▄▄▂▂▃▂▂▂▁▂▁▁▁▂▂▂▁▂▂▃10.08713.52918.71311.6169.35410.06113.98810.0848.2986.9357.7697.9114.1223.5886.3374.6031.8445.4334.2692.765.0517.6919.3073.7823.8225.3072.8492.2662.361.3524.1741.2410.9891.0733.9742.2933.3282.0622.4973.5835.012NA8.201NANA
us-gaap:AccruedLiabilitiesCurrent █▅▆▅▄▃▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▃▃▄▃▂▂▂▁▁▁▁▁▁▂▁▁▂▂▂▂48.76532.71933.94230.46224.84320.19221.36524.95419.34316.54715.89115.1219.40915.62412.69911.87112.32911.33510.83610.78211.78317.32816.23723.02719.00112.29111.72311.2527.3096.3125.7427.6685.7735.6479.868.0358.2069.25312.61612.0312.309NA17.124NANA
us-gaap:LiabilitiesCurrent █▇▇█▇▆▆▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▅▅▅▄▄▄▃▁▁▁▁▁▁▁▂▁▂▂▂115.601101.201105.654111.777102.6592.69992.33582.16971.94866.32669.47764.35774.17375.34274.83669.23758.93758.55754.3651.5256.19463.0764.45364.44463.77261.86257.68749.82344.93713.68915.25613.18211.95811.32417.22412.56419.10616.16526.29919.33321.96NA27.822NANA
us-gaap:NotesPayableCurrent ████▇▇▇▆▆▅▅▅▄▄▄▃▃▂▂▂▁▁█30.030.030.029.8929.7829.67129.56129.45129.34129.23129.12129.01228.90228.79228.68228.57228.46328.35328.24328.13328.02327.91430.0NANANA30.030.030.0NA0.0NANANANANANANANANANANANANANA
 us-gaap:OperatingLeaseLiabilityCurrent us-gaap:BalanceSheetLocation bcrx:AccruedLiabilitiesCurrent▃▃█▁0.9811.0011.1790.925NANA1.377NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent NANA4.896NANANA3.451NANANA1.85NANANA2.234NANANA1.981NANANA4.522NANANA4.676NANANA1.867NANANANANANANANANANANANANANA
us-gaap:TaxesPayableCurrent NANA0.08NANANA0.067NANANA0.051NANANA0.148NANANA0.056NANANA0.102NANANA0.075NANANA0.09NANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:LongTermDebt NANANA45.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LineOfCreditFacility bcrx:CreditAgreement,bcrx:AthyriumNANA125.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtNoncurrent █▄▁126.796123.039119.735NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:BalanceSheetLocation us-gaap:OtherNoncurrentLiabilities█▁▁▂4.13.8833.8713.919NANA3.406NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo █▁▅▄0.8340.6660.7580.746NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree █▁▄▃0.6550.5840.6190.608NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour ▇█▁▁0.5810.5820.5770.577NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA0.582NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA7.327NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:StockholdersEquity ▁▂▄▆▇▅▆▃▄▅▆▇▆▇▇█▅▆▅▅▅▆▆▇▇▇▇▇█▄▅▅▄▄▅▅▅▅▅▅▆-106.075-74.988-19.26233.63776.5073.64838.252-41.253-9.19322.50749.23572.87346.18462.05483.767100.63224.07638.531.5783.99313.38727.79847.72464.04576.08964.37175.63583.45490.089-5.723-1.1263.41-9.047-2.84-0.4549.78415.65923.1514.80626.04239.266NA65.503NANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome▇█▆▆▆▆▆▇▇▅▃▂▁▁▃0.0870.1820.0030.0090.0030.0140.0390.060.041-0.089-0.297-0.41-0.452-0.476-0.243NANANA-0.012NANANA-0.206NANANA-0.13NANANA0.004NANANA0.027NANANA0.04NANANA0.105NANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital███▇▇▅▅▃▃▃▂▂▁▁▁1022.9751010.7791002.408994.811991.574880.319877.3795.589790.076784.278780.4776.724720.587718.037714.869NANANA566.913NANANA558.113NANANA542.943NANANA420.988NANANA391.611NANANA367.829NANANA361.52NANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:CommonStock█████▆▆▂▂▂▂▂▁▁▁1.7871.7771.7691.7661.7641.5421.5411.1041.1041.1031.1011.0960.9890.9870.984NANANA0.738NANANA0.734NANANA0.72NANANA0.591NANANA0.509NANANA0.457NANANA0.45NANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁▂▃▃▄▅▅▅▆▆▇▇▇██-1130.924-1087.726-1023.442-962.949-916.834-878.227-840.628-838.006-800.414-762.785-731.969-704.537-674.94-656.494-631.843NANANA-566.061NANANA-510.917NANANA-467.898NANANA-422.709NANANA-392.601NANANA-353.52NANANA-296.572NANA
us-gaap:CommonStockValue █████▇▇▄▄▄▄▄▄▄▄▄▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁1.7871.7771.7691.7661.7641.5421.5411.1041.1041.1031.1011.0960.9890.9870.9840.9840.8040.8040.7380.7380.7370.7370.7340.7330.7320.7250.720.7190.7170.6010.5910.5910.5420.5140.5090.5090.5010.4920.4570.4520.451NA0.449NANA
us-gaap:AdditionalPaidInCapital █████▆▆▅▅▄▄▄▃▃▃▃▂▂▁▁▁▁▁▁▁1022.9751010.7791002.408994.811991.574880.319877.3795.589790.076784.278780.4776.724720.587718.037714.869711.965620.453618.009566.913564.791562.634560.762558.113556.095553.61NA542.943NANANANANANANANANANANANANANANANANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▁▁▂▂▃▃▄▄▄▄▄▅▅▅▅▆▆▆▆▆▆▆▆▇▇▇▇▇▇▇▇▇▇▇▇██████-1130.924-1087.726-1023.442-962.949-916.834-878.227-840.628-838.006-800.414-762.785-731.969-704.537-674.94-656.494-631.843-612.3-597.166-580.28-566.061-561.558-550.03-533.749-510.917-492.782-478.161-483.062-467.898-456.226-447.495-432.846-422.709-417.28-409.279-397.107-392.601-381.548-371.848-359.572-353.52-340.328-325.87NA-296.572NANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▇█▆▆▆▆▆▇▇▅▃▂▁▁▃▆▆▆▆▆▇▇▄▆▅▆▅▆▆▆▆▆▆▆▆▆▆▇▆▇▇0.0870.1820.0030.0090.0030.0140.0390.060.041-0.089-0.297-0.41-0.452-0.476-0.243-0.017-0.015-0.003-0.0120.0220.0460.048-0.206-0.001-0.0920.01-0.130.0020.0030.0020.0040.0020.0060.0150.0270.040.040.0490.040.050.092NA0.106NANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue NA5.479NA2.8733.282.754NA5.3295.3853.317NA2.0852.0842.903NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapitalNA5.479NA2.8733.282.754NA5.3295.3853.317NA2.0852.0842.903NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▆▁▃▄▅▆▇▅▆▅▆▄▇▆▇▇███-25.411-61.011-44.639-38.255-31.041-23.281-10.448-27.637-24.501-26.998-23.985-35.032-13.895-19.653-10.519-12.43-9.667-8.527-5.854NANANANANANANANA-8.6-7.102-8.959-4.515-7.922-2.895-11.198-7.03-11.777-6.342-12.248-3.984-10.469-3.471-14.327-5.82-9.228NA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▇█▃▆▇▇██▇▆▅▆▇▁▆▄▇▅4.50414.67321.414-34.062-4.93210.72416.26123.51422.27815.881-3.167-9.5251.53315.927-57.5480.387-23.35414.133-9.761NANANANANANANANA4.8659.266-1.023-2.262-5.8092.5322.0723.64611.675-1.97711.54-2.69216.341-10.097.7598.1236.26NA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▁█▁▅▁▄▁▁▂▁▃▁▁▁▄▁▃▁4.5742.9198.868-4.634108.1970.26678.460.1840.41420.041.33763.918-1.275-1.4760.57386.3120.11848.72.332NANANANANANANANA3.373105.7712.4021.89120.0145.3253.040.3162.1372.58211.9250.679-0.439-0.77324.2880.1450.121NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▃▂█▁▅▃▅▃▃▃▂▄▃▃▁▅▂▅-16.248-43.438175.643-76.95172.224-12.29184.273-3.939-1.8098.923-25.81519.361-13.637-5.202-67.3375.845-32.90354.306NANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AmortizationOfFinancingCosts NANA1.3670.3810.3410.3410.3420.3410.3410.2550.2090.2220.2230.2320.2180.2190.220.220.2230.1160.110.110.110.110.110.110.110.110.110.110.110.110.110.110.110.110.110.110.110.1090.1060.031NANANA
us-gaap:DepreciationDepletionAndAmortization ▆▅▆▅▆▇▆▆▆▅▆▆▆▆▆▅▅▅▅▅▃▁▁▁▁▁▁▁▁▁▂▂▂▃▅▄▅▅█▆0.1990.1780.180.1670.1830.2180.1850.1820.1810.1760.1980.1950.1910.1860.1820.1780.1720.1720.1720.1750.0890.0470.0430.0430.0490.0450.040.040.0440.0530.0570.0640.0860.0970.1670.1360.1570.1680.2560.185NANA1.170.308NA
us-gaap:IncreaseDecreaseInAccountsPayable █▁█▇▆▂▅▇▆▄▄▄▆▄▅▅▃▅▅▃▁▄▅▆▆▅▅▅10.116-7.37310.637.8813.944-5.11.7667.3964.008-1.4290.54-0.54.2950.1522.5392.278-2.6171.6421.542-3.324-8.201-0.5411.8113.975.2083.4043.2163.849NANANANANANANANANANANANANANANANANA
us-gaap:IncreaseDecreaseInInventories █▁▄▄4.736-1.9270.7981.008NANA-1.7760.7760.4-1.0490.8280.60.2140.0070.0-1.3050.650.155-1.7320.2830.00.3371.612-1.3080.0980.527NANANANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▆▁▃▄▅▆▇▅▆▅▆▄▇▆▇▇███-25.411-61.011-44.639-38.255-31.041-23.281-10.448-27.637-24.501-26.998-23.985-35.032-13.895-19.653-10.519-12.43-9.667-8.527-5.854NANANANANANANANA-8.6-7.102-8.959-4.515-7.922-2.895-11.198-7.03-11.777-6.342-12.248-3.984-10.469-3.471-14.327-5.82-9.228NA
us-gaap:NetIncomeLoss ▃▁▁▃▄▄▇▄▄▄▅▅▆▅▆▆▆▆▇▆▆▅▆▆█▆▆▇▆▆▇▇▆▇▆▇▆▇▆▆▆▆▆▆▆-43.198-64.284-60.493-46.115-38.607-37.599-2.622-37.592-37.629-31.054-27.432-29.597-18.446-25.777-19.543-15.134-16.886-14.219-4.503-11.528-16.281-22.832-18.135-14.6214.901-15.164-11.672-8.731-14.649-10.137-5.429-8.001-12.172-4.506-11.053-9.7-12.276-6.052-13.192-14.459-16.271-13.027-10.201-10.864-10.193
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings█▁-43.198-64.284NA-46.115-38.607-37.599NA-37.592-37.629-31.054NA-29.597-18.446-25.777NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ShareBasedCompensation █▆▆▃▄▃▄▆▆▄▃▂▂▃▃▆▃▃▂▂▂▃▂▂▄▂▄▂▄▂▁▁▁▂▁▁▁▁▁▁▁▂▁▂7.6325.4795.8872.8733.282.7543.6885.3295.3853.3172.3242.0852.0842.9032.3145.5192.3262.4622.0091.9871.8462.6451.9321.8393.6752.2593.6271.4213.5191.610.8890.9580.9191.6020.8221.1671.1341.0440.91.1441.2611.4671.3081.428NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▇█▃▆▇▇██▇▆▅▆▇▁▆▄▇▅4.50414.67321.414-34.062-4.93210.72416.26123.51422.27815.881-3.167-9.5251.53315.927-57.5480.387-23.35414.133-9.761NANANANANANANANA4.8659.266-1.023-2.262-5.8092.5322.0723.64611.675-1.97711.54-2.69216.341-10.097.7598.1236.26NA
us-gaap:PaymentsToAcquireProductiveAssets ▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▄▇█▁▂▂▁▁▁▁▁▁0.8130.0990.1550.1720.0710.1160.080.0830.0870.0930.1040.0410.1860.0350.1150.1890.0210.003-0.0010.1791.8393.264.0460.1420.3690.5650.0650.0340.00.0070.0040.0NANA-0.0020.0060.040.0690.0010.0010.0230.030.0130.065NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▁█▁▅▁▄▁▁▂▁▃▁▁▁▄▁▃▁4.5742.9198.868-4.634108.1970.26678.460.1840.41420.041.33763.918-1.275-1.4760.57386.3120.11848.72.332NANANANANANANANA3.373105.7712.4021.89120.0145.3253.040.3162.1372.58211.9250.679-0.439-0.77324.2880.1450.121NA
 us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:DebtInstrument,us-gaap:LineOfCreditFacility,us-gaap:LongtermDebtType bcrx:CreditAgreement,bcrx:Athyrium,bcrx:TermALoanNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-07-132011-06-302010-12-31
Value1.7871.7771.7691.7661.7641.5421.5411.1041.1041.1031.1011.0960.9890.9870.9840.9840.8040.8040.7380.7380.7370.7370.7340.7330.7320.7250.720.7190.7170.6010.5910.5910.5420.5140.5090.5090.5010.4920.4570.452700.4510.449
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.60.51.00.81.10.91.20.90.80.70.70.70.60.60.50.70.60.80.80.90.70.60.50.50.60.50.50.51.41.21.11.41.10.90.80.70.60.60.50.00.40.4

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1781771761761761541541101101101101099898989880807373737373737372717171605959545150505049450.0451950.045150.044959
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized

us-gaap:CommonStockSharesAuthorized


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value450450450450450200200200200200200200200200200200200200200200200200200200200200200959595959595959595950.0950.0950.095
Percentage of CommonStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Preferred Stock Shares Authorized

us-gaap:PreferredStockSharesAuthorized

us-gaap:PreferredStockSharesAuthorized


Preferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value5000000.05000000.05000000.05000000.05000000.05000000.05000.05000000.05000000.05000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000000.05000.05000.05000.0
Percentage of PreferredStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1781771761761761541541101101101101099898989880807373737373737372717171605959545150505049450.0451950.045150.044959
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-30
Value17717616115411011011010598988380757373737376727163
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value160.014007120.0005410.0019273.4062.4751.9391.7751.9962.2082.7621.2910.8851.333.8213.4585.6025.0385.2062.7830.9787.0511.2071.0935.994
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic And Diluted

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:EarningsPerShareBasicAndDiluted


Earnings
Period End2021-06-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-240.0-0.24-0.24-0.02-0.34-0.34-0.28-0.25-0.28-0.19-0.26-0.2-0.18-0.21-0.19-0.06-0.16-0.22-0.31-0.25-0.2-0.21-0.16-0.12-0.23-0.17-0.09-0.14-0.23-0.09-0.22-0.19-0.25-0.13-0.29-0.32-0.36-0.29-0.23-0.24-0.23
Percentage of EarningsPerShareBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value7.6325.4795.8872.8733.282.7543.6885.3295.3853.3172.3242.0852.0842.9032.3145.5192.3262.4622.0091.9871.8462.6451.9321.8393.6752.2593.6271.4213.5191.610.8890.958
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.328.7146.647.1114.257.19.3300.2371.956.385.2143.416.773.059.563.075.126.122.425.638.654.942.016.714.233.166.643.9240.046.68.440.1

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardDate, us-gaap:AwardType, us-gaap:PlanName

bcrx:December2019, us-gaap:PerformanceShares, bcrx:IncentivePlan


Allocated
Period End2020-12-312020-06-302020-03-31
Value0.470.0860.0
Percentage of AllocatedShareBasedCompensationExpense8.02.60.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax11.73.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bcrx:December2019 us-gaap:PerformanceShares bcrx:IncentivePlan0.00.00.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:PlanName

bcrx:EmployeeStockPurchasePlan


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.4370.3270.00.2430.00.1190.00.0810.00.1510.00.090.00.0830.00.0640.00.1360.00.0580.00.0890.00.1260.0939069.4e-050.0520.0530.0570.0520.040.033
Percentage of AllocatedShareBasedCompensationExpense5.76.00.08.50.04.30.01.50.04.60.04.30.02.90.01.20.05.50.02.90.03.40.06.92.60.01.43.71.63.24.53.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.91.70.04.00.02.50.04.60.02.60.06.20.02.10.00.70.01.40.00.70.01.80.01.10.40.01.01.63.91.50.41.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bcrx:EmployeeStockPurchasePlan0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bcrx:IncentivePlan


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value6.5194.5545.4462.2872.7682.4373.5295.15.3693.1662.3241.9952.0842.822.3145.4552.3262.3262.0091.9291.8462.5561.9321.7133.6752.1653.5751.3683.4621.5580.8490.925
Percentage of AllocatedShareBasedCompensationExpense85.483.192.579.684.488.595.795.799.795.4100.095.7100.097.1100.098.8100.094.5100.097.1100.096.6100.093.1100.095.898.696.398.496.895.596.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax13.023.9135.637.596.450.58.9287.3370.853.885.2137.216.770.959.562.375.124.622.424.838.653.042.015.614.231.765.642.2236.245.18.038.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bcrx:IncentivePlan0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bcrx:InducementPlan


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value0.6760.5980.4410.3430.5120.1980.1590.148
Percentage of AllocatedShareBasedCompensationExpense8.910.97.511.915.67.24.32.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.43.111.05.617.84.10.48.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bcrx:InducementPlan0.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-43293000.0-64105000.0-60499000.0-46109000.0-38618000.0-37624000.0-2643000.0-37573000.0-37499000.0-30846000.0-27319000.0-29555000.0-18422000.0-26010000.0-19769000.0-15136000.0-16898000.0-14210000.0-4537000.0-11552000.0-16283000.0-22578000.0-18340000.0-14530000.04799000.0-15024000.0-11804000.0-8732000.0-14648000.0-10139000.0-5427000.0-8005000.0-12181000.0-4518000.0-11066000.0-9700000.0-12285000.0-6043000.0-13201000.0-14501000.0-16262000.0-13051000.0
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-86.7-336.4-1506.4-755.6-1345.1-780.1-6.7-2116.8-2589.7-524.0-1001.1-2032.7-147.4-654.2-508.2-172.8-545.3-150.6-50.5-148.8-340.2-468.4-398.5-132.218.6-220.1-216.7-269.7-999.2-293.2-51.4-335.1-1483.7-127.1-269.8-168.4-291.8-49.4-252.7-276.3-435.4-240.1

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312017-12-312017-09-30
Value297000.05923000.033000.01517000.002327000.0001399000.001142000.0
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.00.0100.00.00.0100.00.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.631.10.824.90.05.90.00.023.80.013.0

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value797056484145393636352729302621221820171716232124202120141310169.314128.871413141716181716272217
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax159.2369.61404.9802.51441.3949.6100.32077.42511.5598.21025.72059.6246.1658.7559.2252.4600.7213.2191.1219.0353.4495.2473.6219.879.3311.4378.3458.6892.6313.6159.9389.91578.9249.6360.8239.1341.7140.9311.4344.0481.3311.6161.7191.6235.6

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value13125.6092.9272.9183.0473.0873.0443.0352.7262.4142.3462.1952.2212.2312.142.0942.12.1311.4651.4211.471.3381.2411.3061.3151.3141.2171.2251.2421.2421.1911.1651.181.181.1661.161.161.161.161.1660.288
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax27.067.7139.748.0101.663.27.8171.5209.646.388.5161.317.655.957.424.467.622.323.718.929.730.529.111.35.119.324.137.683.635.911.849.9141.933.228.820.227.69.522.222.131.25.3

Interest Expense Debt

us-gaap:InterestExpenseDebt

us-gaap:InterestExpenseDebt


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value13125.6092.9272.9183.0473.0893.0423.0352.7252.4142.3462.1952.1362.2312.142.0942.022.1311.4651.4211.338
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax27.067.7139.748.0101.663.27.8171.4209.646.388.5161.317.653.757.424.467.621.423.718.929.727.8

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-43198000.0-64284000.0-60493000.0-46115000.0-38607000.0-37599000.0-2622000.0-37592000.0-37629000.0-31054000.0-27432000.0-29597000.0-18446000.0-25777000.0-19543000.0-15134000.0-16886000.0-14219000.0-4503000.0-11528000.0-16281000.0-22832000.0-18135000.0-14621000.04901000.0-15164000.0-11672000.0-8731000.0-14649000.0-10137000.0-5429000.0-8001000.0-12172000.0-4506000.0-11053000.0-9700000.0-12276000.0-6052000.0-13192000.0-14459000.0-16271000.0-13027000.0-10201000.0-10864000.0-10193000.0
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 RevenueFromContractWithCustomerIncludingAssessedTax-86.5-337.3-1506.3-755.7-1344.7-779.6-6.6-2117.9-2598.7-527.5-1005.2-2035.6-147.6-648.3-502.4-172.8-544.9-150.7-50.1-148.5-340.1-473.7-394.1-133.119.0-222.2-214.3-269.6-999.2-293.1-51.4-334.9-1482.6-126.8-269.5-168.4-291.6-49.5-252.5-275.5-435.6-239.7-61.1-90.5-133.8

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-43198000.0-64284000.0-46115000.0-38607000.0-37599000.0-37592000.0-37629000.0-31054000.0-29597000.0-18446000.0-25777000.0
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-86.5-337.3-755.7-1344.7-779.6-2117.9-2598.7-527.5-2035.6-147.6-648.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

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-29582000.0-51377000.0-52405000.0-42864000.0-38510000.0-40978000.0-109000.0-35098000.0-34918000.0-29330000.0-25262000.0-28493000.0-18251000.0-22214000.0-17861000.0-13349000.0-15516000.0-10685000.0-8188000.0-9241000.0-12130000.0-19048000.0-17194000.0-13162000.05342000.0-14430000.0-15156000.0-11610000.0-11619000.0-7386000.0-6334000.0-6925000.0-12142000.0-5316000.0-10695000.0-8016000.0-10176000.0-5001000.0-11042000.0-12805000.0-14243000.0-11499000.0-10308000.0-10990000.0-10330000.0
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 RevenueFromContractWithCustomerIncludingAssessedTax-59.2-269.6-1304.9-702.5-1341.3-849.6-0.3-1977.4-2411.5-498.2-925.7-1959.6-146.1-558.7-459.2-152.4-500.7-113.2-91.1-119.0-253.4-395.2-373.6-119.820.7-211.4-278.3-358.6-792.6-213.6-59.9-289.9-1478.9-149.6-260.8-139.1-241.7-40.9-211.4-244.0-381.3-211.6-61.7-91.6-135.6

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-95000.0179000.06000.0-11000.0-25000.019000.0130000.0208000.042000.024000.0-233000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.20.90.1-0.4-0.51.19.03.52.90.2-5.9

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-95000.0179000.06000.0-11000.0-25000.019000.0130000.0208000.042000.024000.0-233000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.20.90.1-0.4-0.51.19.03.52.90.2-5.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.0

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense

us-gaap:ResearchAndDevelopmentExpense


Research
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value52423530272926252727232221181617151612141420192016171813119.183157.977117.4111112121515141313251914
Percentage of ResearchAndDevelopmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax105.8222.7880.3495.7957.8619.367.41415.21911.7467.0858.61513.5168.2463.8435.1199.9508.5177.7135.3181.7295.9427.0413.9182.663.9250.8339.9402.6754.9265.6147.8333.91428.5208.5270.4209.5303.5126.3291.2281.4374.2246.6150.0160.0193.5

Revenue From Contract With Customer Including Assessed Tax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value49194.0166.1022.8714.823391.7751.4485.8872.7291.454123.9763.898.763.0999.4378.9837.7634.7874.824.60210256.8265.4463.2381.4663.458102.3890.8213.5544.1015.7614.21125.2245.2493.7355.43516127.616
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:CounterpartyName, us-gaap:ProductOrService

bcrx:ORLADEYO, us-gaap:Product


Revenue
Period End2021-06-302021-03-31
Value2810
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax56.857.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax56.857.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bcrx:ORLADEYO us-gaap:Product100.0100.0

bcrx:PERAMIVIR, us-gaap:Product


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.4346.820.00.218
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.935.80.04.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.935.80.04.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bcrx:PERAMIVIR us-gaap:Product100.0100.00.0100.0

bcrx:RAPIVAB, us-gaap:Product


Revenue
Period End2021-06-302021-03-31
Value4.6220.113
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.30.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.30.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bcrx:RAPIVAB us-gaap:Product100.0100.0

bcrx:ToriiPharmaceuticalCo, bcrx:CollaborativeAndOtherResearchAndDevelopment


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-06-30
Value0.2820.2820.2821.0530.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax7.04.69.821.80.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax7.04.69.821.80.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bcrx:ToriiPharmaceuticalCo bcrx:CollaborativeAndOtherResearchAndDevelopment100.0100.0100.0100.00.0

bcrx:USDepartmentOfHealthAndHumanServices, bcrx:CollaborativeAndOtherResearchAndDevelopment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1.4012.0851.9913.0882.5451.6071.3280.9320.7521.8860.9540.9310.3520.3150.3031.492.1610.654
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.810.949.650.688.633.33.352.551.932.035.064.02.87.97.817.069.76.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.810.949.650.688.633.33.352.551.932.035.064.02.87.97.817.069.76.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bcrx:USDepartmentOfHealthAndHumanServices bcrx:CollaborativeAndOtherResearchAndDevelopment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:CounterpartyName, us-gaap:StatementScenario

bcrx:ToriiPharmaceuticalCo, srt:ScenarioForecast


Revenue
Period End2021-06-30
Value15
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax30.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax30.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bcrx:ToriiPharmaceuticalCo srt:ScenarioForecast100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService

bcrx:CollaborativeAndOtherResearchAndDevelopment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1.4012.0852.2733.372.8272.66210.9320.7521.8860.9540.931120.3150.5996.8172.613.116
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.810.956.655.298.555.253.952.551.932.035.064.098.97.915.477.884.233.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.810.956.655.298.555.253.952.551.932.035.064.098.97.915.477.884.233.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bcrx:CollaborativeAndOtherResearchAndDevelopment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bcrx:Milestone


Revenue
Period End2021-06-30
Value15
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax30.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax30.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bcrx:Milestone100.0

us-gaap:Product


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312017-12-312017-09-30
Value33170.6052.4780.00.218150.3350.01.6790.01.501
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax66.993.815.140.60.04.539.118.90.028.50.017.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax66.993.815.140.60.04.539.118.90.028.50.017.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:Product100.0100.0100.0100.00.0100.0100.0100.00.0100.00.0100.0

us-gaap:Royalty


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.128-0.8971.1380.2540.0441.9452.7770.5080.6962.3221.7750.5230.1423.6613.2910.4420.4896.321
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.3-4.728.34.21.540.37.028.648.139.465.036.01.192.184.65.015.867.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.3-4.728.34.21.540.37.028.648.139.465.036.01.192.184.65.015.867.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:Royalty100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense


Selling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value26222017131510118.6596.2384.497.9239.4927.6094.6983.3432.8343.0582.5612.7562.7243.2122.7212.7313.5344.061
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax52.7116.0522.6281.8483.6328.926.4661.1598.0106.0164.5544.976.0191.4120.838.291.432.428.535.556.966.659.124.913.759.5

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value277284334176214136175901161421461681361551781911131298991821021241381501291361371414348533946576476808292108109
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 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
Value277284334176214136175901161421461681361551781911131298991821021241381501291361371414348533946576476808292108109
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 End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value-106.075-74.988-19.26233763.64838-41.253-9.19322497246628310024381.5783.993132747647664758390-5.723-1.1263.41-9.047-2.84-0.4549.7841523142639658646
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-38.3-26.4-5.819.135.62.721.8-45.6-7.915.833.543.333.839.947.052.621.229.71.84.416.327.038.346.150.749.655.360.963.5-13.2-2.36.4-22.7-6.1-0.815.320.528.918.028.236.259.80.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value0.0870.1820.0030.0090.0030.0140.0390.060.041-0.089-0.297-0.41-0.452-0.476-0.243-0.012-0.206-0.130.0040.0270.040.105-0.0260.104
Percentage of StockholdersEquity-0.1-0.2-0.00.00.00.40.1-0.1-0.4-0.4-0.6-0.6-1.0-0.8-0.3-0.8-0.4-0.2-0.4-5.90.30.2-0.00.2
Percentage of Assets0.00.10.00.00.00.00.00.10.0-0.1-0.2-0.2-0.3-0.3-0.1-0.0-0.2-0.10.00.00.00.10.00.0
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 End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value102210101002994991880877795790784780776720718714566558542420391367361348295
Percentage of StockholdersEquity-964.4-1347.9-5204.12957.51296.124131.62293.5-1928.6-8594.33484.61585.11065.91560.31157.1853.435926.01169.5717.8-37387.9-86257.92484.3551.9404.1635.9
Percentage of Assets368.9355.4299.5564.5461.8644.5500.5879.1679.1551.0531.5461.5527.3462.1401.0631.0448.1396.7861.5681.8447.4330.30.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value1.7871.7771.7691.7661.7641.5421.5411.1041.1041.1031.1011.0960.9890.9870.9840.7380.7340.720.5910.5090.4570.450.4390.383
Percentage of StockholdersEquity-1.7-2.4-9.25.32.342.34.0-2.7-12.04.92.21.52.11.61.246.81.51.0-52.5-112.13.10.70.50.8
Percentage of Assets0.60.60.51.00.81.10.91.20.90.80.70.70.70.60.60.80.60.51.20.90.60.40.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value-1130.924-1087.726-1023.442-962.949-916.834-878.227-840.628-838.006-800.414-762.785-731.969-704.537-674.94-656.494-631.843-566.061-510.917-467.898-422.709-392.601-353.52-296.572-262.719-249.268
Percentage of StockholdersEquity1066.21450.55313.3-2862.8-1198.4-24074.2-2197.62031.48706.8-3389.1-1486.7-966.8-1461.4-1057.9-754.3-35872.1-1070.6-618.637540.886476.0-2387.7-452.8-304.5-536.9
Percentage of Assets-407.9-382.4-305.8-546.4-427.0-643.0-479.6-926.0-688.0-535.9-498.5-418.6-493.9-422.5-354.5-630.0-410.2-341.8-865.0-683.5-430.0-271.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value265273323162203125164781031171141289210412517592113666446506584107818913513835424633354146455252607987
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 Assets95.996.396.792.294.991.993.887.189.182.777.976.367.867.070.391.681.387.674.670.656.149.053.060.871.362.765.398.697.482.486.288.084.075.573.172.759.166.164.365.373.779.9

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value210226272961731011142930342652274350117397522358.661122846764854121121132126191420232127162217311311144122
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets75.879.881.354.880.874.665.133.026.424.518.231.219.828.228.261.535.058.024.638.710.512.523.233.651.137.239.888.485.631.343.349.049.531.636.437.428.834.520.024.315.70.012.40.00.00.00.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value27188.6465.4223.9975.642223.5983.6025.0024.2933.3942.3425.6946.1178.9853.3259.5648.7685.9682.2346.243
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.06.52.63.11.94.112.64.03.13.52.92.01.73.73.44.72.97.49.86.52.75.0

Receivables Net Current

us-gaap:ReceivablesNetCurrent

us-gaap:ReceivablesNetCurrent


Receivables
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
Value6.5138.5048.2435.4223.9975.642223.5983.6025.0024.2933.3942.3425.6946.1178.9853.3259.5648.7685.9682.2347.3846.2437.4954.2965.5943.8493.2380.8973.282.1152.3691.0244.3254.5623.7685.0845.8525.831111530
Percentage of ReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.33.02.53.11.94.112.64.03.13.52.92.01.73.73.44.72.97.49.86.52.77.25.05.42.94.32.82.40.67.64.34.52.69.27.95.96.77.37.112.614.727.6

us-gaap:ReceivablesNetCurrent us-gaap:AccountsNotesLoansAndFinancingReceivablesByBillingStatusType

us-gaap:BilledRevenues


Receivables
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312012-09-302012-06-30
Value0.1284.9652.8161.8631.7443.2886.761.9272.5873.9622.7142.0781.2254.4993.9026.6041.4897.2215.0943.9940.9054.4960.6792.0512.2851.5072.7780.4740.2972.010.5420.6740.950.681
Percentage of ReceivablesNetCurrent2.058.434.234.443.658.330.553.671.879.263.261.252.379.063.873.544.875.558.166.940.560.910.927.453.226.972.214.633.161.325.614.825.213.4
Percentage of Assets0.01.70.81.10.82.43.92.12.22.81.81.20.92.92.23.41.35.65.74.41.14.40.51.51.51.22.00.30.24.61.11.21.50.9
Percentage of Assets us-gaap:BilledRevenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:UnbilledRevenues


Receivables
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312012-09-302012-06-30
Value6.3853.5395.4273.5592.2532.354151.6711.0151.041.5791.3161.1171.1952.2152.3811.8362.3433.6741.9741.3292.8885.5645.4442.0114.0873.8492.7640.61.271.5733.8882.8184.403
Percentage of ReceivablesNetCurrent98.041.665.865.656.441.769.546.428.220.836.838.847.721.036.226.555.224.541.933.159.539.189.172.646.873.1100.085.466.938.774.485.274.886.6
Percentage of Assets2.31.21.62.01.01.78.81.80.90.71.10.80.80.81.21.21.61.84.12.21.62.84.53.91.33.12.82.00.42.93.26.84.45.8
Percentage of Assets us-gaap:UnbilledRevenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReceivablesNetCurrent us-gaap:AccountsNotesLoansAndFinancingReceivablesByBillingStatusType, us-gaap:AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyType

us-gaap:BilledRevenues, bcrx:GreenCrossCorporation


Receivables
Period End2021-03-312020-12-312020-09-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-09-30
Value1.1570.740.1421.1862.9240.3030.5420.6420.8760.3130.0510.8991.3880.0480.3590.3820.6860.0090.129
Percentage of ReceivablesNetCurrent13.69.02.621.013.28.415.012.820.49.22.215.822.70.510.84.07.80.21.7
Percentage of Assets0.40.20.10.91.70.30.50.50.60.20.00.60.80.00.30.30.80.00.1
Percentage of Assets us-gaap:BilledRevenues bcrx:GreenCrossCorporation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:BilledRevenues, bcrx:MundipharmaInternationalHoldingsLimited


Receivables
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.0320.0390.0420.0350.0180.0560.040.0490.0210.0440.0750.0430.0220.0470.046
Percentage of ReceivablesNetCurrent0.40.50.80.90.30.31.11.40.41.02.21.80.40.80.5
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:BilledRevenues bcrx:MundipharmaInternationalHoldingsLimited0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:BilledRevenues, bcrx:RoyaltyReceivablesFromPartners


Receivables
Period End2020-12-31
Value2.816
Percentage of ReceivablesNetCurrent34.2
Percentage of Assets0.8
Percentage of Assets us-gaap:BilledRevenues bcrx:RoyaltyReceivablesFromPartners0.0

us-gaap:BilledRevenues, bcrx:ShionogiAndCoLtd


Receivables
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302014-12-31
Value2.0371.6791.6831.6791.3360.160.0961.4510.8540.0350.0272.4221.60.6530.1075.8343.4513.9020.1451.6850.4690.0271.071
Percentage of ReceivablesNetCurrent24.731.042.129.86.04.42.729.019.91.01.242.526.27.33.261.039.465.46.522.87.50.627.8
Percentage of Assets0.61.00.81.20.80.20.11.00.60.00.01.60.90.30.14.53.84.30.21.60.40.00.8
Percentage of Assets us-gaap:BilledRevenues bcrx:ShionogiAndCoLtd0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:BilledRevenues, bcrx:USDepartmentOfHealthAndHumanServices


Receivables
Period End2021-03-312020-06-302019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-06-30
Value3.9660.0191.3530.4770.9980.6730.4030.0870.0230.0420.0630.2760.1140.0830.7232.4752.258
Percentage of ReceivablesNetCurrent46.60.56.113.327.713.511.93.70.40.70.78.31.21.432.433.552.6
Percentage of Assets1.40.00.80.50.90.50.20.10.00.00.00.20.10.10.92.41.5
Percentage of Assets us-gaap:BilledRevenues bcrx:USDepartmentOfHealthAndHumanServices0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:UnbilledRevenues, bcrx:GreenCrossCorporation


Receivables
Period End2021-03-312020-12-312020-09-302020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-31
Value0.0210.0210.0080.0080.0080.0270.0280.0270.0270.0270.028
Percentage of ReceivablesNetCurrent0.20.30.10.10.00.80.70.81.20.50.5
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:UnbilledRevenues bcrx:GreenCrossCorporation0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:UnbilledRevenues, bcrx:RoyaltyReceivablesFromPartners


Receivables
Period End2020-12-31
Value0.025
Percentage of ReceivablesNetCurrent0.3
Percentage of Assets0.0
Percentage of Assets us-gaap:UnbilledRevenues bcrx:RoyaltyReceivablesFromPartners0.0

us-gaap:UnbilledRevenues, bcrx:ShionogiAndCoLtd


Receivables
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.0040.0040.00.0030.004
Percentage of ReceivablesNetCurrent0.00.10.00.10.0
Percentage of Assets0.00.00.00.00.0
Percentage of Assets us-gaap:UnbilledRevenues bcrx:ShionogiAndCoLtd0.00.00.00.00.0

us-gaap:UnbilledRevenues, bcrx:USDepartmentOfHealthAndHumanServices


Receivables
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value6.3813.5145.4023.5472.2532.343151.2920.9891.0141.5251.2891.090.9962.021.9061.632.1863.4951.7461.2732.7345.5365.4442.0112.778
Percentage of ReceivablesNetCurrent98.041.365.565.456.441.567.835.927.520.335.538.046.517.533.021.249.022.939.929.357.037.088.772.646.872.2
Percentage of Assets2.31.21.62.01.01.78.61.40.90.71.00.80.80.61.11.01.41.73.91.91.52.74.43.91.32.0
Percentage of Assets us-gaap:UnbilledRevenues bcrx:USDepartmentOfHealthAndHumanServices0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReceivablesNetCurrent us-gaap:AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyType

bcrx:GreenCrossCorporation


Receivables
Period End2021-03-312020-12-312020-09-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-09-30
Value1.1780.7610.151.1942.9320.330.5420.6420.9040.340.0780.9261.4160.0480.3590.3820.6860.0090.129
Percentage of ReceivablesNetCurrent13.99.22.821.213.29.215.012.821.110.03.316.323.10.510.84.07.80.21.7
Percentage of Assets0.40.20.10.91.70.40.50.50.60.20.10.60.80.00.30.30.80.00.1
Percentage of Assets bcrx:GreenCrossCorporation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bcrx:MundipharmaInternationalHoldingsLimited


Receivables
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.0320.0390.0420.0350.0180.0560.040.0490.0210.0440.0750.0430.0220.0470.046
Percentage of ReceivablesNetCurrent0.40.50.80.90.30.31.11.40.41.02.21.80.40.80.5
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets bcrx:MundipharmaInternationalHoldingsLimited0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bcrx:RoyaltyReceivablesFromPartners


Receivables
Period End2020-12-31
Value2.841
Percentage of ReceivablesNetCurrent34.5
Percentage of Assets0.8
Percentage of Assets bcrx:RoyaltyReceivablesFromPartners0.0

bcrx:ShionogiAndCoLtd


Receivables
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302014-12-31
Value2.0411.6831.6831.6821.340.160.0961.4510.8540.0350.0272.4221.60.6530.1075.8343.4513.9020.1451.6850.4690.0271.071
Percentage of ReceivablesNetCurrent24.831.042.129.86.14.42.729.019.91.01.242.526.27.33.261.039.465.46.522.87.50.627.8
Percentage of Assets0.61.00.81.20.80.20.11.00.60.00.01.60.90.30.14.53.84.30.21.60.40.00.8
Percentage of Assets bcrx:ShionogiAndCoLtd0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bcrx:USDepartmentOfHealthAndHumanServices


Receivables
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value6.3817.485.4023.5472.2722.343161.7691.9871.6871.5251.6921.1771.0192.0621.9691.9062.33.4951.8291.9965.2095.5365.4444.2692.778
Percentage of ReceivablesNetCurrent98.088.065.565.456.841.573.949.255.233.735.549.950.317.933.721.957.324.039.930.689.370.588.772.699.472.2
Percentage of Assets2.32.61.62.01.11.79.32.01.71.21.01.00.90.71.21.01.71.83.92.02.45.14.43.92.82.0
Percentage of Assets bcrx:USDepartmentOfHealthAndHumanServices0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Inventory Net

us-gaap:InventoryNet

us-gaap:InventoryNet


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-06-302015-03-312014-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value9846000.05113000.07039000.06241000.05233000.001776000.01000000.0600000.01649000.0821000.0221000.07000.01305000.0655000.0500000.02232000.01949000.01949000.01612000.01308000.01210000.0683000.0263000.0263000.0263000.0263000.0898000.0898000.0898000.0
Percentage of InventoryNet100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.61.82.13.52.40.02.00.90.41.10.50.20.01.10.50.62.42.41.91.30.90.90.50.40.30.30.31.00.80.8

Inventory Finished Goods

us-gaap:InventoryFinishedGoods

us-gaap:InventoryFinishedGoods


Inventory
Period End2021-06-302021-03-312020-12-312019-12-312014-12-312013-12-312012-12-312012-09-302012-06-302011-12-31
Value529000.0270000.04548000.0276000.0416000.03980000.03980000.03980000.03980000.03980000.0
Percentage of InventoryFinishedGoods100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.11.40.20.38.16.96.25.24.8

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value5560000.05908000.05528000.05241000.03016000.05249000.04422000.03447000.02341000.02087000.02390000.02445000.01729000.02397000.01381000.01421000.01524000.01721000.01438000.02007000.01674000.03221000.04870000.04970000.05449000.04322000.06172000.04546000.05020000.0835000.01725000.01656000.01179000.01781000.01097000.0826000.0344000.0407000.0378000.0795000.0260000.01005000.0
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.02.11.73.01.43.82.53.82.01.51.61.51.31.50.80.71.31.31.62.22.03.13.93.63.63.34.53.33.51.93.53.13.03.81.91.30.50.50.50.90.20.9

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value14131514141914141414
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.38.010.48.316.515.510.429.526.018.1

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

bcrx:LaboratoryEquipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value3.7743.4623.3292.9843.2526.0045.7865.7216.056.033
Percentage of PropertyPlantAndEquipmentGross26.124.821.920.121.931.040.739.740.540.6
Percentage of Assets1.12.02.31.73.64.84.211.710.57.3
Percentage of Assets bcrx:LaboratoryEquipment0.00.00.00.00.00.00.00.00.00.0

us-gaap:FurnitureAndFixtures


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value0.7220.6020.5730.5660.540.7180.5420.60.5960.596
Percentage of PropertyPlantAndEquipmentGross5.04.33.83.83.63.73.84.24.04.0
Percentage of Assets0.20.30.40.30.60.60.41.21.00.7
Percentage of Assets us-gaap:FurnitureAndFixtures0.00.00.00.00.00.00.00.00.00.0

us-gaap:LeaseholdImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value8.5838.5288.4138.4058.2945.615.3035.3165.3165.267
Percentage of PropertyPlantAndEquipmentGross59.461.255.256.555.929.037.336.935.635.4
Percentage of Assets2.64.95.74.79.24.53.910.99.36.4
Percentage of Assets us-gaap:LeaseholdImprovements0.00.00.00.00.00.00.00.00.00.0

us-gaap:OfficeEquipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value0.2110.1840.1520.1460.1411.1221.1151.2661.4861.5
Percentage of PropertyPlantAndEquipmentGross1.51.31.01.01.05.87.88.810.010.1
Percentage of Assets0.10.10.10.10.20.90.82.62.61.8
Percentage of Assets us-gaap:OfficeEquipment0.00.00.00.00.00.00.00.00.00.0

us-gaap:SoftwareDevelopment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value1.1591.1591.1251.1251.1171.4271.4231.448
Percentage of PropertyPlantAndEquipmentGross8.08.37.47.67.57.410.010.0
Percentage of Assets0.30.70.80.61.21.11.03.0
Percentage of Assets us-gaap:SoftwareDevelopment0.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value7.3366.5886.0955.3274.9171414141413
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.23.84.23.05.511.410.228.925.016.8

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
Value7.6697.0357.1137.1427.1497.277.3477.4527.5517.6449.1359.2369.399.3959.5469.6139.6029.7539.92210108.3625.1491.1461.0470.7270.2070.210.2160.260.3060.3590.4250.4860.5830.7510.8820.9991.0981.3531.5371.929
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.82.52.14.13.35.34.28.26.55.46.25.56.96.05.45.08.57.511.011.012.38.14.10.80.70.60.20.20.20.60.60.71.11.01.01.21.21.21.31.51.41.8

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherNoncurrentAssets


Operating
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-03-31
Value3813000.03625000.03802000.03646000.03590000.03799000.03981000.0
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.41.31.12.12.04.22.8
Percentage of Assets us-gaap:OtherNoncurrentAssets0.00.00.00.00.00.00.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value3813000.03625000.03802000.03646000.03720000.03811000.03590000.04245000.04333000.05390000.0978000.01420000.0841000.0222000.02027000.01955000.01871000.02271000.03813000.02190000.01610000.02714000.05468000.05239000.05699000.06495000.06031000.01277000.02700000.04495000.03620000.05075000.05695000.06074000.08694000.09114000.08704000.07734000.07433000.07157000.06695000.00
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets1.41.31.12.11.72.82.04.73.73.80.70.80.60.11.11.01.61.84.22.42.02.64.43.83.85.04.40.91.910.47.49.514.313.015.114.211.49.79.07.76.20.0

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
Value101318119.3541013108.2986.9357.7697.9114.1223.5886.3374.6031.8445.4334.2692.765.0517.6919.3073.7823.8225.3072.8492.2662.361.3524.1741.2410.9891.0733.9742.2933.3282.0622.4973.5835.0128.201
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 Assets3.64.85.66.64.47.48.011.17.14.95.34.73.02.33.62.41.64.24.83.06.17.57.52.72.54.12.11.71.73.18.52.32.52.36.93.64.42.63.03.94.67.5

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value483233302420212419161515191512111211101011171623191211117.3096.3125.7427.6685.7735.6479.868.0358.2069.25312121217
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.611.510.117.311.614.812.227.616.611.610.89.014.210.17.16.210.98.812.111.814.316.813.016.612.79.58.68.25.114.511.814.414.512.017.212.510.811.615.313.011.415.6

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
Value11510110511110292928271666964747574695858545156636464636157494413151311111712191626192127
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 Assets41.735.631.663.447.867.952.790.861.846.647.338.254.348.542.036.251.945.260.556.368.361.351.746.442.547.642.136.331.731.631.224.830.024.130.019.625.120.232.020.920.325.4

Notes Payable Current

us-gaap:NotesPayableCurrent

us-gaap:NotesPayableCurrent


Notes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312014-09-302014-06-302013-12-31
Value30303029292929292929292928282828282828282827303030300.0
Percentage of NotesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets10.810.59.017.013.921.716.932.525.220.519.817.221.218.516.114.925.121.931.430.734.127.124.121.921.921.10.0

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseLiabilityCurrent

bcrx:AccruedLiabilitiesCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value981000.01001000.01179000.0925000.01377000.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.50.8
Percentage of Assets bcrx:AccruedLiabilitiesCurrent0.00.00.00.00.0

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value4896000.03451000.01850000.02234000.01981000.04522000.04676000.01867000.0
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.52.01.31.32.23.63.43.8

Taxes Payable Current

us-gaap:TaxesPayableCurrent

us-gaap:TaxesPayableCurrent


Taxes
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value80000.067000.051000.0148000.056000.0102000.075000.090000.0
Percentage of TaxesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.10.10.10.10.2

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2020-09-30
Value45
Percentage of LongTermDebt100.0
Percentage of Assets25.5

us-gaap:LongTermDebt us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility

bcrx:CreditAgreement, bcrx:Athyrium


Long
Period End2020-12-31
Value125
Percentage of LongTermDebt0.0
Percentage of Assets37.3
Percentage of Assets bcrx:CreditAgreement bcrx:Athyrium0.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-31
Value126123119
Percentage of LongTermDebtNoncurrent100.0100.0100.0
Percentage of Assets45.743.335.8

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OtherNoncurrentLiabilities


Operating
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value4100000.03883000.03871000.03919000.03406000.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0
Percentage of Assets1.51.41.22.21.9
Percentage of Assets us-gaap:OtherNoncurrentLiabilities0.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value834000.0666000.0758000.0746000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0
Percentage of Assets0.30.20.20.4

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value655000.0584000.0619000.0608000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0
Percentage of Assets0.20.20.20.3

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value581000.0582000.0577000.0577000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0
Percentage of Assets0.20.20.20.3

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value582000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.2

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value7327000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets2.2

Operating Lease Liability

us-gaap:OperatingLeaseLiability us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseLiability

bcrx:AccruedLiabilitiesCurrentAndOtherNoncurrentLiabilities


Operating
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value5081000.04884000.05050000.04844000.04783000.0
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets1.81.71.52.72.7
Percentage of Assets bcrx:AccruedLiabilitiesCurrentAndOtherNoncurrentLiabilities0.00.00.00.00.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value10101111
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0
Percentage of Assets4.03.83.36.3

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value5891000.05982000.06115000.06249000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0
Percentage of Assets2.12.11.83.5

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value-106.075-74.988-19.26233763.64838-41.253-9.19322497246628310024381.5783.993132747647664758390-5.723-1.1263.41-9.047-2.84-0.4549.7841523142639658646
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-38.3-26.4-5.819.135.62.721.8-45.6-7.915.833.543.333.839.947.052.621.229.71.84.416.327.038.346.150.749.655.360.963.5-13.2-2.36.4-22.7-6.1-0.815.320.528.918.028.236.259.80.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value0.0870.1820.0030.0090.0030.0140.0390.060.041-0.089-0.297-0.41-0.452-0.476-0.243-0.012-0.206-0.130.0040.0270.040.105-0.0260.104
Percentage of StockholdersEquity-0.1-0.2-0.00.00.00.40.1-0.1-0.4-0.4-0.6-0.6-1.0-0.8-0.3-0.8-0.4-0.2-0.4-5.90.30.2-0.00.2
Percentage of Assets0.00.10.00.00.00.00.00.10.0-0.1-0.2-0.2-0.3-0.3-0.1-0.0-0.2-0.10.00.00.00.10.00.0
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 End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value102210101002994991880877795790784780776720718714566558542420391367361348295
Percentage of StockholdersEquity-964.4-1347.9-5204.12957.51296.124131.62293.5-1928.6-8594.33484.61585.11065.91560.31157.1853.435926.01169.5717.8-37387.9-86257.92484.3551.9404.1635.9
Percentage of Assets368.9355.4299.5564.5461.8644.5500.5879.1679.1551.0531.5461.5527.3462.1401.0631.0448.1396.7861.5681.8447.4330.30.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value1.7871.7771.7691.7661.7641.5421.5411.1041.1041.1031.1011.0960.9890.9870.9840.7380.7340.720.5910.5090.4570.450.4390.383
Percentage of StockholdersEquity-1.7-2.4-9.25.32.342.34.0-2.7-12.04.92.21.52.11.61.246.81.51.0-52.5-112.13.10.70.50.8
Percentage of Assets0.60.60.51.00.81.10.91.20.90.80.70.70.70.60.60.80.60.51.20.90.60.40.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value-1130.924-1087.726-1023.442-962.949-916.834-878.227-840.628-838.006-800.414-762.785-731.969-704.537-674.94-656.494-631.843-566.061-510.917-467.898-422.709-392.601-353.52-296.572-262.719-249.268
Percentage of StockholdersEquity1066.21450.55313.3-2862.8-1198.4-24074.2-2197.62031.48706.8-3389.1-1486.7-966.8-1461.4-1057.9-754.3-35872.1-1070.6-618.637540.886476.0-2387.7-452.8-304.5-536.9
Percentage of Assets-407.9-382.4-305.8-546.4-427.0-643.0-479.6-926.0-688.0-535.9-498.5-418.6-493.9-422.5-354.5-630.0-410.2-341.8-865.0-683.5-430.0-271.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-07-132011-06-302010-12-31
Value1.7871.7771.7691.7661.7641.5421.5411.1041.1041.1031.1011.0960.9890.9870.9840.9840.8040.8040.7380.7380.7370.7370.7340.7330.7320.7250.720.7190.7170.6010.5910.5910.5420.5140.5090.5090.5010.4920.4570.452700.4510.449
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.60.51.00.81.10.91.20.90.80.70.70.70.60.60.50.70.60.80.80.90.70.60.50.50.60.50.50.51.41.21.11.41.10.90.80.70.60.60.50.00.40.4

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value102210101002994991880877795790784780776720718714711620618566564562560558556553542
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets368.9355.4299.5564.5461.8644.5500.5879.1679.1551.0531.5461.5527.3462.1401.0371.8546.6477.2631.0617.2684.3545.1448.1400.2368.6396.7

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-1130900000.0-1087700000.0-1023400000.0-962950000.0-916830000.0-878230000.0-840630000.0-838010000.0-800410000.0-762780000.0-731970000.0-704540000.0-674940000.0-656490000.0-631840000.0-612300000.0-597170000.0-580280000.0-566060000.0-561560000.0-550030000.0-533750000.0-510920000.0-492780000.0-478160000.0-483060000.0-467900000.0-456230000.0-447500000.0-432850000.0-422710000.0-417280000.0-409280000.0-397110000.0-392600000.0-381550000.0-371850000.0-359570000.0-353520000.0-340330000.0-325870000.0-296570000.0
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-407.9-382.4-305.8-546.4-427.0-643.0-479.6-926.0-688.0-535.9-498.5-418.6-493.9-422.5-354.5-319.8-526.1-448.0-630.0-613.7-669.0-518.8-410.2-354.6-318.4-372.0-341.8-332.7-315.2-997.6-865.0-784.3-1025.4-846.7-683.5-595.3-487.8-449.0-430.0-367.9-300.6-271.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value87000.0182000.03000.09000.03000.014000.039000.060000.041000.0-89000.0-297000.0-410000.0-452000.0-476000.0-243000.0-17000.0-15000.0-3000.0-12000.022000.046000.048000.0-206000.0-1000.0-92000.010000.0-130000.02000.03000.02000.04000.02000.06000.015000.027000.040000.040000.049000.040000.050000.092000.0106000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.10.00.00.00.00.00.10.0-0.1-0.2-0.2-0.3-0.3-0.1-0.0-0.0-0.0-0.00.00.10.0-0.2-0.0-0.10.0-0.10.00.00.00.00.00.00.00.00.10.10.10.00.10.10.1

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value5.4792.8733.282.7545.3295.3853.3172.0852.0842.903
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value5.4792.8733.282.7545.3295.3853.3172.0852.0842.903
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.0

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-25411000.0-61011000.0-44639000.0-38255000.0-31041000.0-23281000.0-10448000.0-27637000.0-24501000.0-26998000.0-23985000.0-35032000.0-13895000.0-19653000.0-10519000.0-12430000.0-9667000.0-8527000.0-5854000.0-8600000.0-7102000.0-8959000.0-4515000.0-7922000.0-2895000.0-11198000.0-7030000.0-11777000.0-6342000.0-12248000.0-3984000.0-10469000.0-3471000.0-14327000.0-5820000.0-9228000.0
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-50.9-320.1-1111.5-626.9-1081.2-482.7-26.3-1557.0-1692.1-458.6-878.9-2409.4-111.2-494.3-270.4-141.9-311.9-90.4-65.2-265.6-484.4-259.1-42.7-331.6-352.6-315.1-171.4-204.4-150.6-100.2-76.3-199.4-92.9-263.6-34.9-76.9

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
Value4.5041421-34.062-4.9321016232215-3.167-9.5251.53315-57.5480.387-23.35414-9.7614.8659.266-1.023-2.262-5.8092.5322.0723.64611-1.97711-2.69216-10.097.7598.1236.26
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.077.0533.2-558.2-171.8222.440.91324.71538.5269.8-116.0-655.112.3400.6-1479.44.4-753.6149.8-108.7150.2632.1-29.6-21.4-243.2308.458.388.9202.7-47.094.4-51.5311.3-270.1142.848.752.2

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
Value4.5742.9198-4.6341080.266780.1840.414201.33763-1.275-1.4760.573860.118482.3323.3731052.4021.891205.3253.040.3162.1372.582110.679-0.439-0.773240.1450.121
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.215.24951.9-75.93768.65.5197.510.428.6340.449.04396.0-10.2-37.114.7985.33.8516.126.0104.27214.969.517.9837.8648.685.57.737.161.397.613.0-8.4-20.7446.90.91.0

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-16.248-43.438175-76.95172-12.29184-3.939-1.8098.923-25.81519-13.637-5.202-67.3375-32.90354
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-32.5-227.94373.6-1261.12515.6-254.8212.1-221.9-124.9151.6-946.01331.6-109.1-130.8-1730.8865.8-1061.7575.5

Amortization Of Financing Costs

us-gaap:AmortizationOfFinancingCosts

us-gaap:AmortizationOfFinancingCosts


Amortization
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1367000.0381000.0341000.0341000.0342000.0341000.0341000.0255000.0209000.0222000.0223000.0232000.0218000.0219000.0220000.0220000.0223000.0116000.0110000.0110000.0110000.0110000.0110000.0110000.0110000.0110000.0110000.0110000.0110000.0110000.0110000.0110000.0110000.0110000.0110000.0110000.0110000.0109000.0106000.031000.0
Percentage of AmortizationOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-30
Value199000.0178000.0180000.0167000.0183000.0218000.0185000.0182000.0181000.0176000.0198000.0195000.0191000.0186000.0182000.0178000.0172000.0172000.0172000.0175000.089000.047000.043000.043000.049000.045000.040000.040000.044000.053000.057000.064000.086000.097000.0167000.0136000.0157000.0168000.0256000.0185000.01170000.0308000.0
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value10-7.373107.8813.944-5.11.7667.3964.008-1.4290.54-0.54.2950.1522.5392.278-2.6171.6421.542-3.324-8.201-0.5411.8113.975.2083.4043.2163.849
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInInventories


Increase
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value4736000.0-1927000.0798000.01008000.0-1776000.0776000.0400000.0-1049000.0828000.0600000.0214000.07000.00-1305000.0650000.0155000.0-1732000.0283000.00337000.01612000.0-1308000.098000.0527000.0
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

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-25411000.0-61011000.0-44639000.0-38255000.0-31041000.0-23281000.0-10448000.0-27637000.0-24501000.0-26998000.0-23985000.0-35032000.0-13895000.0-19653000.0-10519000.0-12430000.0-9667000.0-8527000.0-5854000.0-8600000.0-7102000.0-8959000.0-4515000.0-7922000.0-2895000.0-11198000.0-7030000.0-11777000.0-6342000.0-12248000.0-3984000.0-10469000.0-3471000.0-14327000.0-5820000.0-9228000.0
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-50.9-320.1-1111.5-626.9-1081.2-482.7-26.3-1557.0-1692.1-458.6-878.9-2409.4-111.2-494.3-270.4-141.9-311.9-90.4-65.2-265.6-484.4-259.1-42.7-331.6-352.6-315.1-171.4-204.4-150.6-100.2-76.3-199.4-92.9-263.6-34.9-76.9

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-43198000.0-64284000.0-60493000.0-46115000.0-38607000.0-37599000.0-2622000.0-37592000.0-37629000.0-31054000.0-27432000.0-29597000.0-18446000.0-25777000.0-19543000.0-15134000.0-16886000.0-14219000.0-4503000.0-11528000.0-16281000.0-22832000.0-18135000.0-14621000.04901000.0-15164000.0-11672000.0-8731000.0-14649000.0-10137000.0-5429000.0-8001000.0-12172000.0-4506000.0-11053000.0-9700000.0-12276000.0-6052000.0-13192000.0-14459000.0-16271000.0-13027000.0-10201000.0-10864000.0-10193000.0
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 RevenueFromContractWithCustomerIncludingAssessedTax-86.5-337.3-1506.3-755.7-1344.7-779.6-6.6-2117.9-2598.7-527.5-1005.2-2035.6-147.6-648.3-502.4-172.8-544.9-150.7-50.1-148.5-340.1-473.7-394.1-133.119.0-222.2-214.3-269.6-999.2-293.1-51.4-334.9-1482.6-126.8-269.5-168.4-291.6-49.5-252.5-275.5-435.6-239.7-61.1-90.5-133.8

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-43198000.0-64284000.0-46115000.0-38607000.0-37599000.0-37592000.0-37629000.0-31054000.0-29597000.0-18446000.0-25777000.0
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-86.5-337.3-755.7-1344.7-779.6-2117.9-2598.7-527.5-2035.6-147.6-648.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value7.6325.4795.8872.8733.282.7543.6885.3295.3853.3172.3242.0852.0842.9032.3145.5192.3262.4622.0091.9871.8462.6451.9321.8393.6752.2593.6271.4213.5191.610.8890.9580.9191.6020.8221.1671.1341.0440.91.1441.2611.4671.3081.428
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value4.5041421-34.062-4.9321016232215-3.167-9.5251.53315-57.5480.387-23.35414-9.7614.8659.266-1.023-2.262-5.8092.5322.0723.64611-1.97711-2.69216-10.097.7598.1236.26
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.077.0533.2-558.2-171.8222.440.91324.71538.5269.8-116.0-655.112.3400.6-1479.44.4-753.6149.8-108.7150.2632.1-29.6-21.4-243.2308.458.388.9202.7-47.094.4-51.5311.3-270.1142.848.752.2

Payments To Acquire Productive Assets

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:PaymentsToAcquireProductiveAssets


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value813000.099000.0155000.0172000.071000.0116000.080000.083000.087000.093000.0104000.041000.0186000.035000.0115000.0189000.021000.03000.0-1000.0179000.01839000.03260000.04046000.0142000.0369000.0565000.065000.034000.007000.04000.00-2000.06000.040000.069000.01000.01000.023000.030000.013000.065000.0
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value4.5742.9198-4.6341080.266780.1840.414201.33763-1.275-1.4760.573860.118482.3323.3731052.4021.891205.3253.040.3162.1372.582110.679-0.439-0.773240.1450.121
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.215.24951.9-75.93768.65.5197.510.428.6340.449.04396.0-10.2-37.114.7985.33.8516.126.0104.27214.969.517.9837.8648.685.57.737.161.397.613.0-8.4-20.7446.90.91.0

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType

us-gaap:ProceedsFromIssuanceOfLongTermDebt

bcrx:CreditAgreement, bcrx:Athyrium, bcrx:TermALoan


Proceeds
Period End2020-12-07
Value125
Percentage of ProceedsFromIssuanceOfLongTermDebt100.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

bcrx:IncentivePlan


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value25252418181921171717171414141413131312121210109.605
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bcrx:InducementPlan


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value4.2014.2754.1713.5122.6862.0331.329
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber16.716.916.819.114.210.66.3

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

bcrx:IncentivePlan


Share
Period End2021-06-302021-03-312020-12-31
Value0100000.00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.0100.00.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value8230000.07210000.05976000.04750000.04255000.03085000.0472000.0284000.0
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value270232208182225205184167158151
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bcrx:AmortizationOfDebtFinancingCostsAndOriginalIssueDiscounts

bcrx:AmortizationOfDebtFinancingCostsAndOriginalIssueDiscounts


Amortization
Period End2021-06-302021-03-312020-06-302020-03-31
Value154000.0-58000.0341000.0341000.0
Percentage of AmortizationOfDebtFinancingCostsAndOriginalIssueDiscounts100.0100.0100.0100.0

bcrx:AmortizationOfDiscountAndPremiumOnInvestments

bcrx:AmortizationOfDiscountAndPremiumOnInvestments


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value20000.014000.015000.02000.0100000.04000.0116000.018000.045000.0-62000.0-42000.012000.064000.076000.032000.039000.068000.018000.024000.0197000.069000.0233000.0111000.0193000.0
Percentage of AmortizationOfDiscountAndPremiumOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bcrx:CollaborativeAgreementContractCovenantMaximumAmountOfFunding us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType

bcrx:CollaborativeAgreementContractCovenantMaximumAmountOfFunding

bcrx:NationalInstituteOfAllergyAndInfectiousDiseases


Collaborative
Period End2020-08-31
Value43
Percentage of CollaborativeAgreementContractCovenantMaximumAmountOfFunding100.0

bcrx:CollaborativeAgreementContractValue us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType

bcrx:CollaborativeAgreementContractValue

bcrx:NationalInstituteOfAllergyAndInfectiousDiseases


Collaborative
Period End2020-08-312013-09-30
Value6.3265.0
Percentage of CollaborativeAgreementContractValue100.0100.0

bcrx:DebtInstrumentPrepaymentFeePercentageOfAccruedInterest us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility

bcrx:DebtInstrumentPrepaymentFeePercentageOfAccruedInterest

bcrx:PriorToTheSecondAnniversary, bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2020-12-07
Value0.5
Percentage of DebtInstrumentPrepaymentFeePercentageOfAccruedInterest100.0

bcrx:DebtInstrumentPrepaymentFeePercentageOfPrincipalVoluntaryPayments us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility

bcrx:DebtInstrumentPrepaymentFeePercentageOfPrincipalVoluntaryPayments

bcrx:AfterFourthAnniversary, bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2020-12-07
Value0
Percentage of DebtInstrumentPrepaymentFeePercentageOfPrincipalVoluntaryPayments0.0

bcrx:BetweenTheSecondAndThirdAnniversaries, bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2020-12-07
Value2.0
Percentage of DebtInstrumentPrepaymentFeePercentageOfPrincipalVoluntaryPayments0.0

bcrx:BetweenTheThirdAndFourthAnniversaries, bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2020-12-07
Value1.0
Percentage of DebtInstrumentPrepaymentFeePercentageOfPrincipalVoluntaryPayments0.0

bcrx:PriorToTheSecondAnniversary, bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2020-12-07
Value102.0
Percentage of DebtInstrumentPrepaymentFeePercentageOfPrincipalVoluntaryPayments0.0

bcrx:ExpectedReceivableFromAwardsForResearchAndDevelopmentContracts us-gaap:ResearchAndDevelopmentArrangementContractToPerformForOthersByType

bcrx:ExpectedReceivableFromAwardsForResearchAndDevelopmentContracts

bcrx:NationalInstituteOfAllergyAndInfectiousDiseases


Expected
Period End2021-06-302021-03-312020-12-312020-08-31
Value0.0450.02.897
Percentage of ExpectedReceivableFromAwardsForResearchAndDevelopmentContracts0.0100.00.0100.0

bcrx:IncreaseDecreaseInAmortizationOfDebtIssuanceCosts

bcrx:IncreaseDecreaseInAmortizationOfDebtIssuanceCosts


Increase
Period End2021-06-302021-03-312020-06-302020-03-31
Value-341000.0-58000.0340000.0341000.0
Percentage of IncreaseDecreaseInAmortizationOfDebtIssuanceCosts100.0100.0100.0100.0

bcrx:InterestAndOtherIncomeLoss

bcrx:InterestAndOtherIncomeLoss


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value13000.026000.0528000.0-312000.02758000.06446000.0388000.0402000.0
Percentage of InterestAndOtherIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0

bcrx:NonCashInterestExpenseOnRoyaltyFinancingObligation

bcrx:NonCashInterestExpenseOnRoyaltyFinancingObligation


Non
Period End2021-06-302021-03-31
Value8.0687.536
Percentage of NonCashInterestExpenseOnRoyaltyFinancingObligation100.0100.0

bcrx:PaidinkindInterestOnSecuredTermLoan us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility

bcrx:PaidinkindInterestOnSecuredTermLoan

bcrx:CreditAgreement, bcrx:Athyrium


Paidinkind
Period End2021-06-302021-03-31
Value4196000.03549000.0
Percentage of PaidinkindInterestOnSecuredTermLoan100.0100.0

bcrx:PercentageOfCommonStockSharesBeginning us-gaap:PlanName

bcrx:PercentageOfCommonStockSharesBeginning

bcrx:EmployeeStockPurchasePlan


Percentage
Period End2021-06-302021-03-312020-12-31
Value085.00
Percentage of PercentageOfCommonStockSharesBeginning0.0100.00.0

bcrx:PercentageOfCommonStockSharesEnding us-gaap:PlanName

bcrx:PercentageOfCommonStockSharesEnding

bcrx:EmployeeStockPurchasePlan


Percentage
Period End2021-06-302021-03-312020-12-31
Value085.00
Percentage of PercentageOfCommonStockSharesEnding0.0100.00.0

bcrx:PercentageOfSalaryToPurchaseCommonStockMaximum us-gaap:PlanName

bcrx:PercentageOfSalaryToPurchaseCommonStockMaximum

bcrx:EmployeeStockPurchasePlan


Percentage
Period End2021-06-302021-03-312020-12-31
Value015.00
Percentage of PercentageOfSalaryToPurchaseCommonStockMaximum0.0100.00.0

bcrx:ProceedsFromAwardsForResearchAndDevelopmentContracts us-gaap:TypeOfArrangement

bcrx:ProceedsFromAwardsForResearchAndDevelopmentContracts

bcrx:ASPRBARDAContract


Proceeds
Period End2021-06-302021-03-312020-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-06-30
Value0.00.00.00.00.00.00.02.9511711
Percentage of ProceedsFromAwardsForResearchAndDevelopmentContracts0.00.00.00.00.00.00.0100.0100.0100.0

bcrx:ProceedsFromRealizedGainOnInvestments

bcrx:ProceedsFromRealizedGainOnInvestments


Proceeds
Period End2021-03-31
Value1000.0
Percentage of ProceedsFromRealizedGainOnInvestments100.0

bcrx:RevenueFromContractWithCustomerConditionalMilestonePayment us-gaap:CounterpartyName, us-gaap:ProductOrService, us-gaap:StatementScenario

bcrx:RevenueFromContractWithCustomerConditionalMilestonePayment

bcrx:ToriiPharmaceuticalCo, bcrx:TheBCX7353Product, srt:ScenarioForecast


Revenue
Period End2021-12-312020-12-31
Value15000.020000.0
Percentage of RevenueFromContractWithCustomerConditionalMilestonePayment100.0100.0

bcrx:RoyaltyExpenseReversalOfExpense

bcrx:RoyaltyExpenseReversalOfExpense


Royalty
Period End2021-06-302021-03-312020-06-302020-03-31
Value46000.0-36000.0069000.0
Percentage of RoyaltyExpenseReversalOfExpense100.0100.00.0100.0

bcrx:RoyaltyFinancingObligationInterestAccretion us-gaap:CounterpartyName, us-gaap:LongtermDebtType

bcrx:RoyaltyFinancingObligationInterestAccretion

bcrx:RPI2019IntermediateFinanceTrust, bcrx:FutureRoyaltiesPayable


Royalty
Period End2021-06-302021-03-31
Value8.0687.536
Percentage of RoyaltyFinancingObligationInterestAccretion100.0100.0

bcrx:RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInKeyTerritories us-gaap:CounterpartyName, us-gaap:ProductOrService, us-gaap:StatementScenario

bcrx:RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInKeyTerritories

bcrx:RPI2019IntermediateFinanceTrust, bcrx:ORLADEYO, bcrx:AnnualNetSalesBetween350000And550000


Royalty
Period End2020-12-07
Value2.75
Percentage of RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInKeyTerritories100.0

bcrx:RPI2019IntermediateFinanceTrust, bcrx:ORLADEYO, bcrx:AnnualNetSalesUnder350000


Royalty
Period End2020-12-07
Value8.75
Percentage of RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInKeyTerritories318.2

bcrx:Rpi2019IntermediateFinanceTrust, bcrx:ORLADEYO, bcrx:AnnualNetSalesBetween350000And550000


Royalty
Period End2020-12-07
Value2.75
Percentage of RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInKeyTerritories100.0

bcrx:Rpi2019IntermediateFinanceTrust, bcrx:ORLADEYO, bcrx:AnnualNetSalesUnder350000


Royalty
Period End2020-12-07
Value8.75
Percentage of RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInKeyTerritories318.2

bcrx:RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInOtherMarkets us-gaap:CounterpartyName, us-gaap:ProductOrService, us-gaap:StatementScenario

bcrx:RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInOtherMarkets

bcrx:RPI2019IntermediateFinanceTrust, bcrx:ORLADEYO, bcrx:AnnualNetSalesBetween150000And230000


Royalty
Period End2020-12-07
Value10.0
Percentage of RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInOtherMarkets100.0

bcrx:RPI2019IntermediateFinanceTrust, bcrx:ORLADEYO, bcrx:AnnualNetSalesUnder150000


Royalty
Period End2020-12-07
Value20.0
Percentage of RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInOtherMarkets200.0

bcrx:Rpi2019IntermediateFinanceTrust, bcrx:ORLADEYO, bcrx:AnnualNetSalesBetween150000And230000


Royalty
Period End2020-12-07
Value10.0
Percentage of RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInOtherMarkets100.0

bcrx:Rpi2019IntermediateFinanceTrust, bcrx:ORLADEYO, bcrx:AnnualNetSalesUnder150000


Royalty
Period End2020-12-07
Value20.0
Percentage of RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInOtherMarkets200.0

bcrx:RoyaltyPurchaseAgreementRoyaltiesPercentageOfGlobalAnnualNetSales us-gaap:CounterpartyName, us-gaap:ProductOrService

bcrx:RoyaltyPurchaseAgreementRoyaltiesPercentageOfGlobalAnnualNetSales

bcrx:RPI2019IntermediateFinanceTrust, bcrx:BCX9930


Royalty
Period End2020-12-07
Value1.0
Percentage of RoyaltyPurchaseAgreementRoyaltiesPercentageOfGlobalAnnualNetSales100.0

bcrx:Rpi2019IntermediateFinanceTrust, bcrx:BCX9930


Royalty
Period End2020-12-07
Value1.0
Percentage of RoyaltyPurchaseAgreementRoyaltiesPercentageOfGlobalAnnualNetSales100.0

bcrx:RoyaltyPurchaseAgreementRoyaltiesPercentageOfSublicenseRevenueInOtherMarkets us-gaap:CounterpartyName, us-gaap:ProductOrService

bcrx:RoyaltyPurchaseAgreementRoyaltiesPercentageOfSublicenseRevenueInOtherMarkets

bcrx:RPI2019IntermediateFinanceTrust, bcrx:ORLADEYO


Royalty
Period End2020-12-07
Value20.0
Percentage of RoyaltyPurchaseAgreementRoyaltiesPercentageOfSublicenseRevenueInOtherMarkets100.0

bcrx:Rpi2019IntermediateFinanceTrust, bcrx:ORLADEYO


Royalty
Period End2020-12-07
Value20.0
Percentage of RoyaltyPurchaseAgreementRoyaltiesPercentageOfSublicenseRevenueInOtherMarkets100.0

bcrx:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodAwardsAvailable us-gaap:PlanName

bcrx:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodAwardsAvailable

bcrx:IncentivePlan


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value854000.01074000.06922000.00532000.015000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodAwardsAvailable100.0100.0100.00.0100.0100.0

bcrx:InducementPlan


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0138000.0664000.0836000.0743000.0759000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodAwardsAvailable0.012.89.60.0139.75060.0

bcrx:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsForfeituresInPeriodAwardsAvailable us-gaap:PlanName

bcrx:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsForfeituresInPeriodAwardsAvailable

bcrx:IncentivePlan


Sharebased
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value66000.039000.094000.0535000.0657000.01838000.0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsForfeituresInPeriodAwardsAvailable100.0100.0100.0100.0100.0100.0

bcrx:InducementPlan


Sharebased
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value51000.027000.05000.010000.090000.055000.0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsForfeituresInPeriodAwardsAvailable77.369.25.31.913.73.0

us-gaap:AdvertisingExpense

us-gaap:AdvertisingExpense


Advertising
Period End2021-06-302021-03-312020-06-30
Value1800000.01404000.00
Percentage of AdvertisingExpense100.0100.00.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility, us-gaap:VariableRate

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1

bcrx:CreditAgreement, bcrx:Athyrium, us-gaap:LondonInterbankOfferedRateLIBOR


Debt
Period End2020-12-07
Value8.25
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility, us-gaap:VariableRate

bcrx:PikInterestPaymentIsMade, bcrx:CreditAgreement, bcrx:Athyrium, us-gaap:LondonInterbankOfferedRateLIBOR


Debt
Period End2020-12-07
Value10.25
Percentage of DebtInstrumentBasisSpreadOnVariableRate1124.2

us-gaap:DerivativeGainOnDerivative us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeGainOnDerivative

us-gaap:ForeignExchangeContract, us-gaap:Nondesignated


Derivative
Period End2020-12-312020-09-302019-12-312019-09-302018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302014-12-31
Value2000.028000.0033000.01000.051000.0045000.0000109000.04755000.0
Percentage of DerivativeGainOnDerivative100.0100.00.0100.0100.0100.00.0100.00.00.00.0100.0100.0

us-gaap:DerivativeLossOnDerivative us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeLossOnDerivative

us-gaap:ForeignExchangeContract, us-gaap:Nondesignated


Derivative
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value2000.040000.0570000.020000.0-185000.0-114000.0443000.0-580000.0-618000.01804000.0-71000.0-85000.0400000.01543000.0-5718000.0931000.03688000.02753000.0-229000.01125000.0
Percentage of DerivativeLossOnDerivative100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ExtinguishmentOfDebtAmount us-gaap:CreditFacility, us-gaap:LineOfCreditFacility

us-gaap:ExtinguishmentOfDebtAmount

bcrx:SeniorCreditFacility, bcrx:MidCapFinancialServicesLLC


Extinguishment
Period End2020-12-31
Value40
Percentage of ExtinguishmentOfDebtAmount100.0

us-gaap:GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments

us-gaap:GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments


Gain
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-134000.0-29000.0-996000.0-12000.063000.0-20000.0186000.0148000.0-223000.0406000.0-442000.0631000.01507000.0-1804000.071000.0130000.0521000.0-1543000.05718000.0-931000.0-2877000.0-2753000.0229000.0-352000.0749000.0464000.04755000.04082000.0-1824000.0-1526000.02126000.097000.01114000.01957000.0782000.0-572000.0-997000.038000.0-1074000.0-586000.0-998000.0-1342000.0
Percentage of GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossRelatedToLitigationSettlement us-gaap:LitigationCase, us-gaap:IncomeStatementLocation

us-gaap:GainLossRelatedToLitigationSettlement

bcrx:ArbitrationProceedingsOfSulAgreement, us-gaap:OtherIncome


Gain
Period End2021-03-312020-12-312020-09-30
Value6138000.000
Percentage of GainLossRelatedToLitigationSettlement100.00.00.0

us-gaap:IncreaseDecreaseInContractWithCustomerLiability

us-gaap:IncreaseDecreaseInContractWithCustomerLiability


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312018-12-312018-09-30
Value148000.0255000.0-282000.0-283000.0-352000.0-1053000.021000.0-100000.0
Percentage of IncreaseDecreaseInContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDerivativeAssets

us-gaap:IncreaseDecreaseInDerivativeAssets


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-2000.0-40000.0-570000.0-20000.0185000.0114000.0-1052000.0406000.0-443000.0579000.0619000.0-1804000.0892000.085000.0-400000.0-1543000.08183000.0-931000.0-3688000.0-2753000.0229000.0-461000.0-796000.0464000.04755000.0-2618000.04876000.0-1526000.02126000.06239000.0-5029000.01958000.0
Percentage of IncreaseDecreaseInDerivativeAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInInterestPayableNet

us-gaap:IncreaseDecreaseInInterestPayableNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value1670000.01877000.02366000.01498000.01425000.01477000.01481000.0-1322000.01353000.01544000.01421000.0-4405000.01367000.01370000.01390000.0-882000.01296000.01301000.01427000.0-1640000.01229000.01228000.01229000.01067000.0-2791000.01212000.01205000.01038000.0-766000.0685000.0-924000.0590000.01070000.0-2572000.01050000.01050000.0-968000.01061000.0257000.0
Percentage of IncreaseDecreaseInInterestPayableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-9816000.09850000.0692000.02265000.0-1664000.0847000.0346000.01102000.0237000.0-321000.0-54000.0716000.0-668000.01015000.0-860000.0-104000.0-197000.0284000.0-3035000.0333000.0-1313000.0313000.0124000.0-562000.01079000.0-1848000.01914000.0437000.0484000.0-892000.061000.0506000.0-626000.0679000.0230000.0498000.0-90000.0-15000.0-416000.0535000.0-416000.0-329000.0-182000.0-234000.0
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value180.2612.8211.425-1.645-16.50418-0.004-1.40.7090.8991.052-3.352-0.423-2.8685.66-6.2390.7962.83.734-5.151.141-1.2523.199-1.298-3.8966.252-0.0950.0531.165-0.2541.345-3.301-0.2370.794-1.316-0.7690.022-5.803-4.327-10.101-4.1654.6635.033
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseExpense

us-gaap:OperatingLeaseExpense


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value461000.0452000.0433000.0386000.0487000.0448000.0400000.0358000.0397000.0309000.0
Percentage of OperatingLeaseExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2021-06-302021-03-312020-06-302020-03-31
Value379000.0440000.0433000.0408000.0
Percentage of OperatingLeasePayments100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-31
Value-92000.0178000.0
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-3000.01000.0-6000.06000.0-11000.0-25000.0-21000.019000.0130000.0208000.0113000.042000.024000.0-233000.0-226000.0-2000.0-12000.09000.0-34000.0-24000.0-2000.0254000.0-205000.091000.0-102000.0140000.0-132000.0-1000.01000.0-2000.02000.0-4000.0-9000.0-12000.0-9000.09000.0-9000.0-42000.09000.0-24000.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaidInKindInterest

us-gaap:PaidInKindInterest


Paid
Period End2021-06-302021-03-31
Value3910000.03549000.0
Percentage of PaidInKindInterest100.0100.0

us-gaap:PaymentsOfDebtExtinguishmentCosts us-gaap:CreditFacility, us-gaap:LineOfCreditFacility

us-gaap:PaymentsOfDebtExtinguishmentCosts

bcrx:SeniorCreditFacility, bcrx:MidCapFinancialServicesLLC


Payments
Period End2020-12-31
Value3298000.0
Percentage of PaymentsOfDebtExtinguishmentCosts100.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt


Payments
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-302011-12-312011-09-302010-12-312010-09-30
Value0.0340.00.00.03.0181926124.327686.5025.48728163.378583.2013.2849.3678.742141.666-0.0478.7329.0925.81520
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesDebt0.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromCollaborators us-gaap:CounterpartyName

us-gaap:ProceedsFromCollaborators

bcrx:USDepartmentOfHealthAndHumanServices


Proceeds
Period End2020-09-03
Value6.932
Percentage of ProceedsFromCollaborators100.0

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromIssuanceOfCommonStock


Proceeds
Period End2020-12-312020-09-302019-11-182018-12-312018-08-062017-12-312017-09-302017-06-302017-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-032014-06-302013-12-312013-08-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0.4310.0530.0530.5850.0470.00.01.1750.00.0115115-0.01518184.8110.36-0.0062.4723.66111
Percentage of ProceedsFromIssuanceOfCommonStock100.00.0100.00.0100.0100.0100.00.0100.00.00.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfDebt us-gaap:CounterpartyName, us-gaap:LongtermDebtType

us-gaap:ProceedsFromIssuanceOfDebt

bcrx:RPI2019IntermediateFinanceTrust, bcrx:FutureRoyaltiesPayable


Proceeds
Period End2020-12-07
Value125
Percentage of ProceedsFromIssuanceOfDebt100.0

bcrx:Rpi2019IntermediateFinanceTrust, bcrx:FutureRoyaltiesPayable


Proceeds
Period End2020-12-07
Value125
Percentage of ProceedsFromIssuanceOfDebt100.0

us-gaap:ProceedsFromIssuanceOfWarrants

us-gaap:ProceedsFromIssuanceOfWarrants


Proceeds
Period End2020-12-312020-09-302019-11-21
Value0.00.019
Percentage of ProceedsFromIssuanceOfWarrants0.00.0100.0

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value5.31814210.4910101623221816161420108.6549.737144.3819126.326.53610222.4825.08.1128.356.4857.0254.442.385.3189.70410156.0412413121326
Percentage of ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProceedsFromStockOptionsExercised


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value4574000.02900000.01282000.0366000.0532000.0266000.078000.0184000.0414000.0563000.01357000.0759000.0468000.0268000.090000.0423000.0118000.0950000.0113000.0171000.026000.07000.01263000.0462000.03244000.0155000.0361000.0491000.0341000.03804000.016000.0971000.0244000.0102000.012000.012000.01000.0509000.038000.02000.098000.0140000.061000.012000.0
Percentage of ProceedsFromStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value01000.0001000.0000001000.01000.000-1000.01000.0-1000.0001000.010000.0001000.04000.08000.000000000
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax0.0100.00.00.0100.00.00.00.00.00.0100.0100.00.00.0100.0100.0100.00.00.0100.0100.00.00.0100.0100.0100.00.00.00.00.00.00.00.00.0

us-gaap:RepaymentsOfLinesOfCredit

us-gaap:RepaymentsOfLinesOfCredit


Repayments
Period End2020-12-312018-12-312018-09-302018-06-302018-03-31
Value470.00.5751.7251.725
Percentage of RepaymentsOfLinesOfCredit100.00.0100.0100.0100.0

us-gaap:RepaymentsOfLinesOfCredit us-gaap:CreditFacility, us-gaap:LineOfCreditFacility

bcrx:SeniorCreditFacility, bcrx:MidCapFinancialServicesLLC


Repayments
Period End2020-12-07
Value43
Percentage of RepaymentsOfLinesOfCredit0.0

us-gaap:RoyaltyExpense

us-gaap:RoyaltyExpense


Royalty
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value48000.09000.0069000.0244000.018000.026000.087000.070000.018000.0243000.0140000.0129000.0115000.022000.0294000.0155000.0143000.027000.077000.021000.05000.0442000.060000.043000.005000.073000.017000.004000.077000.018000.0114000.0
Percentage of RoyaltyExpense100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

bcrx:IncentivePlanAndInducementPlan


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value084.20.282.9630.0020.835-80.1980.1900.81
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate0.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

bcrx:IncentivePlanAndInducementPlan


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value00.800.395-0.0030.008-1.9821.977-0.0020.025
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate0.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee

bcrx:EmployeeStockPurchasePlan


Share
Period End2021-06-302021-03-312020-12-31
Value03000.00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee0.0100.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized

bcrx:InducementPlan


Share
Period End2020-12-312020-09-30
Value01200000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized0.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod

bcrx:IncentivePlan


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value66000.039000.094000.0535000.0657000.01838000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod100.0100.0100.0100.0100.0100.0

bcrx:InducementPlan


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value51000.027000.05000.010000.090000.055000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod77.369.25.31.913.73.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod

bcrx:IncentivePlan


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value854000.01074000.06922000.00532000.015000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod100.0100.0100.00.0100.0100.0

bcrx:InducementPlan


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0138000.0664000.0836000.0743000.0759000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod0.012.89.60.0139.75060.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage us-gaap:AwardDate, us-gaap:AwardType, us-gaap:PlanName, us-gaap:Vesting

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage

bcrx:August2013, us-gaap:PerformanceShares, bcrx:IncentivePlan, bcrx:VestUponSuccessfulCompletionOfSpecificDevelopmentMilestones


Sharebased
Period End2020-12-312020-09-302020-06-302020-03-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value25.074.2500.7500000.750000.750000.750
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage100.0100.00.0100.00.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.0

bcrx:December2014, us-gaap:PerformanceShares, bcrx:IncentivePlan, bcrx:VestUponSuccessfulCompletionOfSpecificDevelopmentMilestones


Sharebased
Period End2020-12-312020-09-302020-06-302020-03-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-31
Value084.1500.8500000.30
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage0.0113.30.0113.30.00.00.00.040.00.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage us-gaap:AwardType, us-gaap:PlanName, us-gaap:Vesting

us-gaap:EmployeeStockOption, bcrx:IncentivePlan, bcrx:Vest25PercentEachYearUntilFullyVested


Sharebased
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value025.0024.7500.250000.250000.250000.250000.2500
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage0.00.00.033.30.033.30.00.00.00.00.00.00.033.30.00.00.033.30.00.00.033.30.00.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage us-gaap:PlanName, us-gaap:Vesting

bcrx:InducementPlan, bcrx:Vest25PercentEachYearUntilFullyVested


Sharebased
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value025.0024.7500.2500
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage0.00.00.033.30.033.30.00.0

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans


Stock
Period End2021-03-31
Value193000.0
Percentage of StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans100.0

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans us-gaap:PlanName

bcrx:EmployeeStockPurchasePlan


Stock
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0193000.00110000.0068000.0047000.0
Percentage of StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans0.0100.00.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans us-gaap:StatementEquityComponents

us-gaap:CommonStock


Stock
Period End2021-03-312020-09-302020-03-312019-09-302019-03-312018-09-302018-03-31
Value193000.0137000.0110000.068000.047000.043000.049000.0
Percentage of StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans100.00.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised


Stock
Period End2021-03-312020-06-302019-06-30
Value593000.0193000.0100000.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap:PlanName

bcrx:IncentivePlan


Stock
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-06-302019-03-31
Value1033000.0586000.0317000.000096000.0155000.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised0.098.80.00.00.00.096.00.0

bcrx:InducementPlan


Stock
Period End2021-06-302021-03-31
Value23000.07000.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised0.01.2

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-06-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1056000.0593000.0193000.0100000.0160000.0200000.0226000.0242000.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised0.0100.0100.0100.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan


Stock
Period End2021-06-302021-03-312020-09-302020-03-312019-09-302019-03-312018-09-302018-03-31
Value7632000.0723000.0366000.0266000.0184000.0220000.0164000.0187000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-03-312019-09-302019-03-312018-09-302018-03-31
Value7632000.0721000.0364000.0265000.0184000.0220000.0164000.0186000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.099.799.599.6100.0100.0100.099.5

us-gaap:CommonStock


Stock
Period End2021-03-312020-09-302020-03-312019-03-312018-03-31
Value2000.02000.01000.001000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan0.30.50.40.00.5

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised


Stock
Period End2021-06-302021-03-312020-06-302020-03-312019-06-302019-03-312018-09-302018-06-302018-03-31
Value4574000.02177000.0532000.0266000.0414000.0343000.0595000.0468000.081000.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-06-302020-03-312019-06-302019-03-312018-09-302018-06-302018-03-31
Value4564000.02171000.0530000.0265000.0413000.0341000.0593000.0466000.079000.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised99.899.799.699.699.899.499.799.697.5

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-06-302020-03-312019-06-302019-03-312018-09-302018-06-302018-03-31
Value10000.06000.02000.01000.01000.02000.02000.02000.02000.0
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised0.20.30.40.40.20.60.30.42.5

us-gaap:WriteOffOfDeferredDebtIssuanceCost us-gaap:CreditFacility, us-gaap:LineOfCreditFacility

us-gaap:WriteOffOfDeferredDebtIssuanceCost

bcrx:SeniorCreditFacility, bcrx:MidCapFinancialServicesLLC


Write
Period End2020-12-31
Value1211000.0
Percentage of WriteOffOfDeferredDebtIssuanceCost100.0

bcrx:AccruedDevelopmentCosts

bcrx:AccruedDevelopmentCosts


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value15117.5646.6837.42710
Percentage of AccruedDevelopmentCosts100.0100.0100.0100.0100.0100.0

bcrx:AccruedInventoryExpense

bcrx:AccruedInventoryExpense


Accrued
Period End2020-12-312019-12-312018-12-312016-12-312015-12-312014-12-31
Value2453000.029000.01649000.0705000.0549000.0397000.0
Percentage of AccruedInventoryExpense100.0100.0100.0100.0100.0100.0

bcrx:AvailableForSaleDebtSecuritiesAccruedInterest

bcrx:AvailableForSaleDebtSecuritiesAccruedInterest


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value2000.017000.025000.031000.03000.0103000.0116000.0250000.0309000.0421000.0444000.0432000.0359000.0379000.0412000.0
Percentage of AvailableForSaleDebtSecuritiesAccruedInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bcrx:AvailableForSaleDebtSecuritiesAccruedInterest us-gaap:FinancialInstrument

us-gaap:CertificatesOfDeposit


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value2000.011000.011000.09000.03000.07000.07000.013000.018000.012000.014000.018000.024000.030000.032000.0
Percentage of AvailableForSaleDebtSecuritiesAccruedInterest100.064.744.029.0100.06.86.05.25.82.93.24.26.77.97.8

us-gaap:USGovernmentAgenciesDebtSecurities


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value6000.014000.018000.0044000.050000.086000.0144000.0183000.0176000.0170000.0136000.0148000.0177000.0
Percentage of AvailableForSaleDebtSecuritiesAccruedInterest35.356.058.10.042.743.134.446.643.539.639.437.939.143.0

bcrx:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughTwoYearsFairValue

bcrx:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughTwoYearsFairValue


Available
Period End2020-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-31
Value3.0020.7411122293338344.5399.6033.8038.92614183228272329250.3020.6022.6792.5821.15114
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughTwoYearsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bcrx:DebtInstrumentCommitmentFeePercentage us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility

bcrx:DebtInstrumentCommitmentFeePercentage

bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2020-12-07
Value1.0
Percentage of DebtInstrumentCommitmentFeePercentage100.0

bcrx:DebtInstrumentCovenantMinimumUnrestrictedCashAndCashEquivalents us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility

bcrx:DebtInstrumentCovenantMinimumUnrestrictedCashAndCashEquivalents

bcrx:TermLoanAAndBDrawn, bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2020-12-07
Value20
Percentage of DebtInstrumentCovenantMinimumUnrestrictedCashAndCashEquivalents100.0

bcrx:TermLoanADrawn, bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2020-12-07
Value15
Percentage of DebtInstrumentCovenantMinimumUnrestrictedCashAndCashEquivalents75.0

bcrx:TermLoansABAndCDrawn, bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2020-12-07
Value15
Percentage of DebtInstrumentCovenantMinimumUnrestrictedCashAndCashEquivalents75.0

bcrx:TermLoansABAndCDrawnAndCureRightExercised, bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2020-12-07
Value20
Percentage of DebtInstrumentCovenantMinimumUnrestrictedCashAndCashEquivalents100.0

bcrx:DebtInstrumentExitFeePercentageOfPrincipal us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility

bcrx:DebtInstrumentExitFeePercentageOfPrincipal

bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2020-12-07
Value2.0
Percentage of DebtInstrumentExitFeePercentageOfPrincipal100.0

bcrx:DebtInstrumentLiborCap us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility

bcrx:DebtInstrumentLiborCap

bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2020-12-07
Value3.5
Percentage of DebtInstrumentLiborCap100.0

bcrx:DebtInstrumentLiborFloor us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility

bcrx:DebtInstrumentLiborFloor

bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2020-12-07
Value1.75
Percentage of DebtInstrumentLiborFloor100.0

bcrx:DeferredTaxAssetsLeasingObligations

bcrx:DeferredTaxAssetsLeasingObligations


Deferred
Period End2020-12-312019-12-31
Value1135000.01070000.0
Percentage of DeferredTaxAssetsLeasingObligations100.0100.0

bcrx:DeferredTaxAssetsRoyaltyIncome

bcrx:DeferredTaxAssetsRoyaltyIncome


Deferred
Period End2020-12-31
Value28
Percentage of DeferredTaxAssetsRoyaltyIncome100.0

bcrx:DeferredTaxLiabilitiesRightOfUseAssets

bcrx:DeferredTaxLiabilitiesRightOfUseAssets


Deferred
Period End2020-12-312019-12-31
Value854000.0803000.0
Percentage of DeferredTaxLiabilitiesRightOfUseAssets100.0100.0

bcrx:EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedForRemainderOfFiscalYear

bcrx:EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedForRemainderOfFiscalYear


Employee
Period End2021-06-302021-03-312020-09-30
Value11142.708
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedForRemainderOfFiscalYear100.0100.0100.0

bcrx:EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearFour

bcrx:EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearFour


Employee
Period End2021-06-302021-03-312020-12-312020-09-30
Value867000.0417000.09571000.0595000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearFour100.0100.0100.0100.0

bcrx:EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearThree

bcrx:EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearThree


Employee
Period End2021-06-302021-03-312020-12-312020-09-30
Value1211123.137
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearThree100.0100.0100.0100.0

bcrx:EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearTwo

bcrx:EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearTwo


Employee
Period End2021-06-302021-03-312020-12-312020-09-30
Value1514166.983
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearTwo100.0100.0100.0100.0

bcrx:EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedNextYear

bcrx:EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedNextYear


Employee
Period End2021-06-302021-03-312020-12-312020-09-30
Value2018178.461
Percentage of EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedNextYear100.0100.0100.0100.0

bcrx:FutureRoyaltiesPayable

bcrx:FutureRoyaltiesPayable


Future
Period End2021-06-302021-03-312020-12-31
Value136131124
Percentage of FutureRoyaltiesPayable100.0100.0100.0

bcrx:FutureRoyaltiesPayable us-gaap:CounterpartyName

bcrx:RPI2019IntermediateFinanceTrust


Future
Period End2020-12-31
Value125
Percentage of FutureRoyaltiesPayable100.2

bcrx:Rpi2019IntermediateFinanceTrust


Future
Period End2020-12-31
Value125
Percentage of FutureRoyaltiesPayable100.2

bcrx:LesseeOperatingLeaseLiabilityToBePaidAfterYearFour

bcrx:LesseeOperatingLeaseLiabilityToBePaidAfterYearFour


Lessee
Period End2021-06-302021-03-312020-09-30
Value7327000.07327000.07908000.0
Percentage of LesseeOperatingLeaseLiabilityToBePaidAfterYearFour100.0100.0100.0

bcrx:LongTermDebtIncludingPaidInKindInterest us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility

bcrx:LongTermDebtIncludingPaidInKindInterest

bcrx:CreditAgreement, bcrx:Athyrium


Long
Period End2021-06-302021-03-31
Value132128
Percentage of LongTermDebtIncludingPaidInKindInterest100.0100.0

bcrx:OperatingLeaseRightofuseAssetAccumulatedAmortization

bcrx:OperatingLeaseRightofuseAssetAccumulatedAmortization


Operating
Period End2021-06-302021-03-312020-12-312019-12-31
Value2111000.02940000.02641000.01386000.0
Percentage of OperatingLeaseRightofuseAssetAccumulatedAmortization100.0100.0100.0100.0

bcrx:ReceivablesPayablesNetCurrent us-gaap:AccountsNotesLoansAndFinancingReceivablesByBillingStatusType, us-gaap:AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyType

bcrx:ReceivablesPayablesNetCurrent

us-gaap:BilledRevenues, bcrx:RoyaltyReceivablesFromPartners


Receivables
Period End2021-06-30
Value128000.0
Percentage of ReceivablesPayablesNetCurrent100.0

us-gaap:BilledRevenues, bcrx:ShionogiAndCoLtd


Receivables
Period End2021-03-31
Value-190000.0
Percentage of ReceivablesPayablesNetCurrent0.0

us-gaap:UnbilledRevenues, bcrx:RoyaltyReceivablesFromPartners


Receivables
Period End2021-06-30
Value4000.0
Percentage of ReceivablesPayablesNetCurrent3.1

us-gaap:UnbilledRevenues, bcrx:ShionogiAndCoLtd


Receivables
Period End2021-03-31
Value4000.0
Percentage of ReceivablesPayablesNetCurrent0.0

bcrx:ReceivablesPayablesNetCurrent us-gaap:AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyType

bcrx:RoyaltyReceivablesFromPartners


Receivables
Period End2021-06-30
Value132000.0
Percentage of ReceivablesPayablesNetCurrent103.1

bcrx:ShionogiAndCoLtd


Receivables
Period End2021-03-31
Value-186000.0
Percentage of ReceivablesPayablesNetCurrent0.0

us-gaap:AccountsReceivableNet us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:AccountsReceivableNet

us-gaap:TradeAccountsReceivable


Accounts
Period End2020-12-31
Value0.0
Percentage of AccountsReceivableNet0.0

us-gaap:AccountsReceivableNet us-gaap:ProductOrService, us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

bcrx:ORLADEYO, us-gaap:TradeAccountsReceivable


Accounts
Period End2021-06-302021-03-312020-12-31
Value209.8820.149
Percentage of AccountsReceivableNet0.00.00.0

bcrx:RAPIVAB, us-gaap:TradeAccountsReceivable


Accounts
Period End2021-06-302021-03-312020-12-31
Value0.1820.00.254
Percentage of AccountsReceivableNet0.00.00.0

us-gaap:AccruedProfessionalFeesCurrent

us-gaap:AccruedProfessionalFeesCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value333000.0326000.0118000.0729000.0242000.0242000.0238000.048000.0
Percentage of AccruedProfessionalFeesCurrent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedRoyaltiesCurrentAndNoncurrent us-gaap:CounterpartyName

us-gaap:AccruedRoyaltiesCurrentAndNoncurrent

bcrx:RPI2019IntermediateFinanceTrust


Accrued
Period End2021-06-302021-03-31
Value2502000.0957000.0
Percentage of AccruedRoyaltiesCurrentAndNoncurrent100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax


Available
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
Value1000.04000.06000.09000.03000.015000.040000.067000.082000.052000.019000.01000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:FinancialInstrument

us-gaap:CertificatesOfDeposit


Available
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312017-12-31
Value1000.03000.03000.03000.05000.07000.010000.08000.06000.01000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax25.050.033.3100.033.317.514.99.811.5100.0

us-gaap:USGovernmentAgenciesDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1000.03000.03000.06000.008000.023000.038000.050000.031000.015000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.075.050.066.70.053.357.556.761.059.678.9

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax


Available
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3000.001000.01000.07000.041000.0141000.0316000.0410000.0452000.0476000.0244000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax us-gaap:FinancialInstrument

us-gaap:USGovernmentAgenciesDebtSecurities


Available
Period End2020-12-312020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3000.0002000.013000.055000.0131000.0188000.0204000.0205000.0122000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.00.0-0.028.631.739.041.545.945.143.150.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value8.11113284915112138618499968789105
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:FinancialInstrument

us-gaap:CertificatesOfDeposit


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value0.9372.7583.2253.4770.9381.181.6692.3983.5593.5593.5594.5436.9859.82111
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis11.620.511.47.05.910.77.66.35.84.23.64.78.011.010.5

us-gaap:USGovernmentAgenciesDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value7.174102445144.501101632465051474460
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis88.479.588.691.894.140.747.943.152.655.050.653.153.849.457.1

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue


Available
Period End2020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-31
Value462238617277675347644340233217272222231719185.9771017161425
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:AvailableForSaleSecuritiesDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value8.114132849151122386284100968789105
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FinancialInstrument

us-gaap:CertificatesOfDeposit


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value0.9392.773.2393.4890.9441.1921.6832.4213.5843.5723.5594.5466.9879.8311
Percentage of AvailableForSaleSecuritiesDebtSecurities11.620.611.57.05.910.77.66.35.84.23.64.78.011.010.5

us-gaap:USGovernmentAgenciesDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value7.175102545144.553101632465051464460
Percentage of AvailableForSaleSecuritiesDebtSecurities88.479.488.591.894.140.747.943.052.654.950.653.153.749.457.1

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value8.11413284615112238617277675347644340233217272222231719185.977101716169.3581314171225214040
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent


Available
Period End2020-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value3.0020.7411122293341414.5399.6033.8038.92614244147473641410.3020.6022.6792.5820.681.1512.5131615161211
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value21423027498175103115313537285434485312045772330
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CollateralAlreadyPostedAggregateFairValue us-gaap:DerivativeInstrumentRisk

us-gaap:CollateralAlreadyPostedAggregateFairValue

bcrx:CurrencyHedgeAgreement


Collateral
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value00000000000000002190000.01610000.000000
Percentage of CollateralAlreadyPostedAggregateFairValue0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0100.0100.00.00.00.00.00.0

us-gaap:DebtInstrumentFaceAmount us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility

us-gaap:DebtInstrumentFaceAmount

bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2020-12-07
Value200
Percentage of DebtInstrumentFaceAmount100.0

us-gaap:DebtInstrumentFaceAmount us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType

bcrx:CreditAgreement, bcrx:Athyrium, bcrx:TermBLoan


Debt
Period End2020-12-07
Value25
Percentage of DebtInstrumentFaceAmount12.5

bcrx:CreditAgreement, bcrx:Athyrium, bcrx:TermCLoan


Debt
Period End2020-12-07
Value50
Percentage of DebtInstrumentFaceAmount25.0

us-gaap:DebtInstrumentInterestRateEffectivePercentage us-gaap:CounterpartyName, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentInterestRateEffectivePercentage

bcrx:Rpi2019IntermediateFinanceTrust, bcrx:FutureRoyaltiesPayable


Debt
Period End2020-12-31
Value24.0
Percentage of DebtInstrumentInterestRateEffectivePercentage100.0

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet us-gaap:DebtInstrument, us-gaap:LineOfCreditFacility

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

bcrx:CreditAgreement, bcrx:Athyrium


Debt
Period End2021-06-302021-03-312020-12-31
Value8163000.08010000.07764000.0
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet100.0100.0100.0

us-gaap:DeferredFinanceCostsNet us-gaap:CounterpartyName, us-gaap:LongtermDebtType

us-gaap:DeferredFinanceCostsNet

bcrx:Rpi2019IntermediateFinanceTrust, bcrx:FutureRoyaltiesPayable


Deferred
Period End2020-12-31
Value2370000.0
Percentage of DeferredFinanceCostsNet100.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value978000.0917000.0649000.0899000.02089000.02668000.0-2285000.0-207000.0
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredRevenueCurrent

us-gaap:DeferredRevenueCurrent


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value551000.0405000.0150000.0432000.0715000.01067000.02120000.0221000.0221000.0221000.0221000.0200000.0300000.07300000.08484000.08686000.01717000.01869000.02022000.02282000.02134000.02163000.01481000.01482000.01473000.01473000.01539000.01538000.01536000.01392000.01308000.04072000.02400000.09786000.03370000.03321000.02497000.0
Percentage of DeferredRevenueCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value271233209183227207187167158151
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsDomestic

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsDomestic


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value159155137117158142135119
Percentage of DeferredTaxAssetsOperatingLossCarryforwardsDomestic100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value5563000.03801000.05258000.02046000.02849000.02590000.01178000.0311000.0539000.0422000.0
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsResearch

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsResearch


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value66635955534838373638
Percentage of DeferredTaxAssetsTaxCreditCarryforwardsResearch100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value109.7867.1086.4248.9528.6057.0865.2826.4745.915
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value124000.0114000.0418000.0421000.0674000.0
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value116.194.6592.9050.4250.4242.1051.527
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized


Employee
Period End2021-06-302021-03-312020-12-312020-09-30
Value60595621
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityCurrent


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value981000.01001000.01179000.0925000.01096000.01301000.01377000.047000.0
Percentage of FinanceLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityNoncurrent


Finance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value4100000.03883000.03871000.03919000.03834000.03729000.03406000.02703000.0
Percentage of FinanceLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPayableCurrent

us-gaap:InterestPayableCurrent


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-09-012011-06-302010-12-31
Value2523211917161413141311101413121011108.997.5639.2037.9746.7465.5174.457.2416.0294.8243.7864.5523.8672.7343.6583.0681.9980.9283.52.451.40.354.21.3180.0
Percentage of InterestPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:InterestPayableCurrentAndNoncurrent dei:LegalEntity, us-gaap:DebtInstrument

us-gaap:InterestPayableCurrentAndNoncurrent

bcrx:JPRRoyaltySubLLC, bcrx:PhaRMANotes


Interest
Period End2021-06-302021-03-312020-12-012014-09-01
Value2322204.2
Percentage of InterestPayableCurrentAndNoncurrent100.0100.0100.0100.0

us-gaap:InterestPayableCurrentAndNoncurrent us-gaap:CounterpartyName, us-gaap:LongtermDebtType

bcrx:Rpi2019IntermediateFinanceTrust, bcrx:FutureRoyaltiesPayable


Interest
Period End2020-12-31
Value2.108
Percentage of InterestPayableCurrentAndNoncurrent0.0

us-gaap:InventoryGross

us-gaap:InventoryGross


Inventory
Period End2021-06-302021-03-312020-12-31
Value105.3837.309
Percentage of InventoryGross100.0100.0100.0

us-gaap:InventoryRawMaterials

us-gaap:InventoryRawMaterials


Inventory
Period End2021-06-302021-03-312020-12-31
Value4990000.0101000.0206000.0
Percentage of InventoryRawMaterials100.0100.0100.0

us-gaap:InventoryRawMaterialsNetOfReserves

us-gaap:InventoryRawMaterialsNetOfReserves


Inventory
Period End2020-09-30
Value206000.0
Percentage of InventoryRawMaterialsNetOfReserves100.0

us-gaap:InventoryValuationReserves

us-gaap:InventoryValuationReserves


Inventory
Period End2021-06-302021-03-312020-12-312019-12-312013-12-312012-12-312012-09-302012-06-302011-12-31
Value270000.0270000.0270000.0276000.04243000.04243000.03980000.03980000.04615000.0
Percentage of InventoryValuationReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryWorkInProcess

us-gaap:InventoryWorkInProcess


Inventory
Period End2021-06-302021-03-312020-12-31
Value4597000.05012000.02555000.0
Percentage of InventoryWorkInProcess100.0100.0100.0

us-gaap:InventoryWorkInProcessNetOfReserves

us-gaap:InventoryWorkInProcessNetOfReserves


Inventory
Period End2020-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value6035000.01305000.0655000.0500000.02232000.01949000.01949000.01612000.0267000.0
Percentage of InventoryWorkInProcessNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value969000.0805000.01302000.0851000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2021-06-302021-03-312020-09-30
Value606000.0902000.0403000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0100.0100.0

us-gaap:LineOfCredit

us-gaap:LineOfCredit


Line
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value2631364146494925281315161819212222
Percentage of LineOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCredit us-gaap:CreditFacility, us-gaap:LineOfCreditFacility

bcrx:SeniorCreditFacility, bcrx:MidCapFinancialServicesLLC


Line
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-07-202018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-09-262016-09-23
Value45505050505050303030192123232323232323
Percentage of LineOfCredit167.3157.7136.9121.1108.6100.3100.8118.2106.00.0145.1140.8137.3125.1115.0106.4101.50.00.0

us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd us-gaap:CreditFacility, us-gaap:LineOfCreditFacility

us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd

bcrx:SeniorCreditFacility, bcrx:MidCapFinancialServicesLLC


Line
Period End2020-09-30
Value8.5
Percentage of LineOfCreditFacilityInterestRateAtPeriodEnd100.0

us-gaap:LinesOfCreditCurrent

us-gaap:LinesOfCreditCurrent


Lines
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1919149.024.0364.581.6216.536.4976.4644.7272.9971.276
Percentage of LinesOfCreditCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths


Long
Period End2020-09-30
Value20
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo


Long
Period End2020-09-30
Value20
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear


Long
Period End2020-09-30
Value5000000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


Operating
Period End2021-06-302021-03-312020-12-312020-09-30
Value12.812.812.712.8
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwards

us-gaap:DomesticCountry


Operating
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value677653569484431386356310277
Percentage of OperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCountry


Operating
Period End2020-12-31
Value6.427
Percentage of OperatingLossCarryforwards0.9

us-gaap:StateAndLocalJurisdiction


Operating
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value494509496431403373361332311
Percentage of OperatingLossCarryforwards73.078.087.389.093.396.7101.4107.3112.4

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4348000.04008000.02221000.02213000.02188000.01559000.01551000.01547000.04629000.02394000.01544000.01506000.07625000.04599000.03286000.03122000.05357000.02798000.01546000.01506000.04426000.01965000.01612000.01622000.01569000.02637000.0150000.0150000.0150000.0150000.0151000.0150000.02129000.0616000.0308000.0300000.02230000.0955000.0625000.0625000.01416000.0625000.0
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalents

bcrx:CollateralForCredit


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1428000.01421000.01425000.01418000.01422000.01425000.01417000.01414000.01419000.01415000.01413000.01413000.01412000.01411000.01410000.01409000.01408000.01407000.01405000.01405000.01404000.0
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue32.835.564.264.165.091.491.491.430.759.191.593.818.530.742.945.126.350.390.993.331.7

bcrx:RoyaltyReceivable


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2920000.02587000.0796000.0795000.0766000.0134000.0134000.0133000.03210000.0979000.0131000.06213000.03188000.01876000.01713000.03949000.01391000.0141000.0101000.03022000.0562000.059000.070000.018000.01087000.0
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue67.264.535.835.935.08.68.68.669.340.98.581.569.357.154.973.749.79.16.768.328.63.74.31.141.2

us-gaap:RevenueRemainingPerformanceObligation us-gaap:CounterpartyName

us-gaap:RevenueRemainingPerformanceObligation

bcrx:ToriiPharmaceuticalCo


Revenue
Period End2020-09-30
Value1899000.0
Percentage of RevenueRemainingPerformanceObligation100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized

bcrx:EmployeeStockPurchasePlan


Share
Period End2021-06-302021-03-312020-12-312020-09-30
Value7975000.04475000.04475000.04475000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

bcrx:EmployeeStockPurchasePlan


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value6.182.6792.8732.8733.0090.0090.1190.1190.1870.1870.2340.2340.2770.0002770.3260.330.3640.3640.4220.4220.4630.4630.4970.4970.5190.5190.5380.5380.5590.0590.0880.0880.1280.1280.1770.1770.084
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bcrx:IncentivePlan


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value103.4574.59211102.7780.9684.0634.1020.4460.8050.280.3290.4760.4681.5811.5780.5912.2732.1482.1890.1270.0162.362
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant164.5129.0159.8397.5362.030866.7813.43414.32193.6238.5344.0119.7118.8171841.2143.6479.1433.5162.4538.6509.0472.827.43.2439.0

bcrx:InducementPlan


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.1690.1180.2290.8880.5141.1670.171
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant2.74.48.030.917.112966.7143.7

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber

bcrx:IncentivePlanAndInducementPlan


Share
Period End2020-12-31
Value26
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 us-gaap:PlanName

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

bcrx:InducementPlan


Sharebased
Period End2020-12-31
Value29
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares


Sharebased
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value16119.2957.2025.5984.8634.3854.3854.209
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares100.0100.0100.0100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept


TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:PlanName
(None,)
Allocated Share Based Compensation Expenseus-gaap: Plan Name
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:ProductOrService
(None,)
Revenue From Contract With Customer Including Assessed Taxus-gaap: Product Or Service
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:CounterpartyName, us-gaap:ProductOrService
(None, 'us-gaap:Product')
Revenue From Contract With Customer Including Assessed Taxus-gaap: Counterparty Name, us-gaap: Product Or Service
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:CounterpartyName, us-gaap:ProductOrService
(None, 'bcrx:CollaborativeAndOtherResearchAndDevelopment')
Revenue From Contract With Customer Including Assessed Taxus-gaap: Counterparty Name, us-gaap: Product Or Service
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:ReceivablesNetCurrent
us-gaap:AccountsNotesLoansAndFinancingReceivablesByBillingStatusType
(None,)
Receivables Net Currentus-gaap: Accounts Notes Loans And Financing Receivables By Billing Status Type
us-gaap:ReceivablesNetCurrent
us-gaap:AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyType
(None,)
Receivables Net Currentus-gaap: Accounts Notes Loans And Financing Receivables By Legal Entity Of Counterparty Type
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)
Property Plant And Equipment Grossus-gaap: Property Plant And Equipment By Type
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components