Document And Entity Information
us-gaap_DerivativeLossOnDerivative
Derivative, Loss on Derivative
bcrx_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedNextYear
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Expected to be Recognized Next Year
Employee service share-based compensation nonvested awards compensation cost expected to be recognized next year.
Expected Dividend Yield
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
bcrx_DebtInstrumentMinimumLibor
Debt Instrument, Minimum LIBOR
The minimum LIBOR interest that will be added to the basis spread.
Note To Financial Statement Details Textual
Significant Accounting Policies
Note 1 - Significant Accounting Policies
Note 5 - Lease Obligations and Other Contingencies
Risk-Free Interest Rate
Note 7 - Stock-based Compensation
Note 1 - Significant Accounting Policies - Fair Value of the Company's Investments by Type (Details)
us-gaap_DerivativeGainOnDerivative
Derivative, Gain on Derivative
Note 1 - Significant Accounting Policies - Summary of Receivables (Details)
Not Designated as Hedging Instrument [Member]
Note 1 - Significant Accounting Policies - Summary of Inventories (Details)
Note 1 - Significant Accounting Policies - Summary of Revenues (Details)
Note 5 - Lease Obligations and Other Contingencies - Remaining Maturities of Lease Liabilities (Details)
Note 7 - Stock-based Compensation - Stock Plan Activities (Details)
Note 7 - Stock-based Compensation - Weighted Average Assumptions for Stock Option Awards Granted to Employees and Directors Under the Plans (Details)
Unrealized (loss) gain on available for sale investments
Hedging Designation [Axis]
Notes To Financial Statements
Hedging Designation [Domain]
Expected Volatility
Notes To Financial Statements [Abstract]
Arbitration Proceedings of SUL Agreement [Member]
Represents the arbitration proceedings of several terms under SUL Agreement.
us-gaap_LiabilitiesCurrent
Total current liabilities
Expected Life (Year)
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
us-gaap_LitigationSettlementAmountAwardedFromOtherParty
Litigation Settlement, Amount Awarded from Other Party
Share-based Payment Arrangement, Activity [Table Text Block]
Foreign currency translation adjustment
Sales and maturities of investments
US Government Agencies Debt Securities [Member]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Awards available, Restricted stock awards granted (in shares)
Other comprehensive income (loss)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Weighted average exercise price, ending balance (in dollars per share)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)
Non-recourse notes payable
us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax
Foreign Exchange Contract [Member]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)
us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
Purchases of investments
Financial Instruments [Domain]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted average exercise price, beginning balance (in dollars per share)
Weighted average exercise price, ending balance (in dollars per share)
Financial Instrument [Axis]
Weighted average exercise price, stock option awards cancelled (in dollars per share)
Weighted average exercise price, stock option awards granted (in dollars per share)
Weighted average exercise price, stock option awards exercised (in dollars per share)
Accrued expenses
bcrx_MilestonePaymentReceived
Milestone Payment Received
Represents the amount of milestone payment received.
Interest payable
Accounts payable
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options outstanding, beginning balance (in shares)
Options outstanding, ending balance (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Options outstanding, stock option awards cancelled (in shares)
Credit Facility [Axis]
Credit Facility [Domain]
us-gaap_PolicyTextBlockAbstract
Accounting Policies
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee (in shares)
us-gaap_PaymentsToAcquireProductiveAssets
Acquisitions of property and equipment
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)
Awards available, beginning balance (in shares)
Awards available, ending balance (in shares)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAcceleratedVestingNumber
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number (in shares)
Plan amendment (in shares)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage
Liabilities and Stockholders’ Equity
Vesting [Axis]
Vesting [Domain]
Product [Member]
us-gaap_Assets
Total assets
Plan Name [Axis]
Plan Name [Domain]
us-gaap_OperatingLeaseExpense
Operating Lease, Expense
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total
Secured Credit Facility, Third Tranche [Member]
Represent the third tranche of a secured credit facility.
Secured Credit Facility, Second Tranche [Member]
Represents the second tranche of a secured credit facility.
Secured Credit Facility, First Tranche [Member]
Represents the first tranche of a secured credit facility.
Share-based Payment Arrangement [Text Block]
Award Type [Domain]
Award Date [Axis]
Award Date [Domain]
Award Type [Axis]
Net loss
Net loss
Thereafter
bcrx_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour
Amount of lessee's undiscounted obligation for lease payment for operating lease due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).
Performance Shares [Member]
Amortization of premium/discount on investments
Amount of amortization expense attributable to the discount and premium on investments.
Share-based Payment Arrangement, Option [Member]
Property and equipment, net
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
Leases of Lessor Disclosure [Text Block]
(Loss) gain on foreign currency
Derivative Instrument [Axis]
Derivative Contract [Domain]
Investing activities
Estimated Fair Value
us-gaap_ExtinguishmentOfDebtAmount
Extinguishment of Debt, Amount
Interest payable
us-gaap_IncreaseDecreaseInInterestPayableNet
Accounts payable and accrued expenses
us-gaap_IncreaseDecreaseInAccountsPayable
us-gaap_DebtInstrumentTerm
Debt Instrument, Term (Month)
Restricted cash
Restricted Cash and Cash Equivalents, Current, Total
Cash and cash equivalents
Royalty [Member]
us-gaap_AllocatedShareBasedCompensationExpense
Share-based Payment Arrangement, Expense
us-gaap_LegalFees
Legal Fees
Amendment Flag
us-gaap_ComprehensiveIncomeNetOfTax
Comprehensive loss
City Area Code
Use of Estimates, Policy [Policy Text Block]
bcrx_RoyaltyFinancingObligationInterestAccretion
Royalty Financing Obligation Interest Accretion
Represents the accrued interest added to royalty financing.
New Accounting Pronouncements, Policy [Policy Text Block]
bcrx_PaidinkindInterestOnSecuredTermLoan
Paid-in-Kind Interest on Secured Term Loan
Represents the amount of paid in kind interest accrued.
Collaboration Receivables [Member]
Represents receivables from collaborations for reimbursable research and development costs.
PERAMIVIR [Member]
Information pertaining to Peramivir
bcrx_LongTermDebtIncludingPaidInKindInterest
Long-term Debt, Including Paid-in-Kind Interest
Amount, after unamortized (discount) premium, debt issuance costs and paid-in-kind interests, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
us-gaap_IncreaseDecreaseInContractWithCustomerLiability
Deferred revenue
Common stock, shares outstanding (in shares)
Preferred stock, shares outstanding (in shares)
bcrx_AverageMaturityPeriodOfHighQualityMarketableSecurities
Average Maturity Period of High Quality Marketable Securities (Month)
Average maturity period of high quality marketable securities.
us-gaap_IncreaseDecreaseInDerivativeAssets
Change in fair value of foreign currency derivative
bcrx_MaturityperiodOfShortTermInvestment
Maturity Period of Short Term Investment (Month)
Maturity period of short term investment.
Current Fiscal Year End Date
us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Debt Instrument, Basis Spread on Variable Rate
us-gaap_DebtInstrumentInterestRateStatedPercentage
Debt Instrument, Interest Rate, Stated Percentage
bcrx_CollaborativeAgreementContractValue
Collaborative Agreement Contract Value
Represents collaborative agreement contract value.
us-gaap_DebtInstrumentInterestRateEffectivePercentage
Debt Instrument, Interest Rate, Effective Percentage
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses and other assets
us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent
Operating Lease, Weighted Average Discount Rate, Percent
Document Fiscal Period Focus
Document Fiscal Year Focus
Document Period End Date
us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1
Operating Lease, Weighted Average Remaining Lease Term (Year)
Entity File Number
Entity Emerging Growth Company
us-gaap_DebtInstrumentFaceAmount
Debt Instrument, Face Amount
us-gaap_WriteOffOfDeferredDebtIssuanceCost
Write off of Deferred Debt Issuance Cost
Document Type
Entity Small Business
bcrx_AverageMaturityForPortfolioInvestments
Average Maturity for Portfolio Investments (Month)
Average maturity for portfolio investments during the period.
us-gaap_GainLossRelatedToLitigationSettlement
Gain (Loss) Related to Litigation Settlement, Total
Entity Shell Company
Document Information [Line Items]
Document Information [Table]
Entity Filer Category
Debt Instrument [Axis]
Entity Current Reporting Status
Debt Instrument, Name [Domain]
London Interbank Offered Rate (LIBOR) [Member]
US Department of Health and Human Services [Member]
United States department of health and human services.
Variable Rate [Domain]
AECOM and IRL [Member]
AECOM and IRL
UAB [Member]
UAB
us-gaap_AccountsReceivableNet
Accounts Receivable, after Allowance for Credit Loss, Total
us-gaap_IncreaseDecreaseInReceivables
Receivables
Issuance of pre-funded warrants
Variable Rate [Axis]
Stock-based compensation expense
bcrx_ProceedsFromAwardsForResearchAndDevelopmentContracts
Proceeds from awards for Research and Development Contracts
Represents proceeds from awards for research and development contracts.
Entity Tax Identification Number
Entity Central Index Key
Entity Registrant Name
Entity [Domain]
Legal Entity [Axis]
Entity Address, Address Line One
Entity Address, City or Town
Entity Address, Postal Zip Code
bcrx_ExpectedReceivableFromAwardsForResearchAndDevelopmentContracts
Expected Receivable From Awards for Research and Development Contracts
Represents expected receivable from awards for research and development contracts.
Entity Address, State or Province
Accrued Liabilities, Current [Member]
Primary financial statement caption encompassing current accrued liabilities.
us-gaap_AllowanceForDoubtfulAccountsReceivable
Accounts Receivable, Allowance for Credit Loss, Ending Balance
Base Contract [Member]
The base contract of ASPR/BARDA to support BCX4430 drug manufacturing.
Additional Development Options [Member]
The additional development options that can be exercised by the Government.
ASPRBARDA Contract [Member]
The potential value of the ASPR/BARDA Contract.
Entity Common Stock, Shares Outstanding
Green Cross Corporation [Member]
Represents Green Cross Corporation.
bcrx_MilestonePaymentMinimum
Milestone Payment Minimum
Represents milestone payment minimum.
bcrx_TransactionCosts
Transaction Costs
Represents transaction costs associated with royalty monetization.
us-gaap_AdvertisingExpense
Advertising Expense
bcrx_InterestReserve
Interest Reserve
Represents interest reserve established as part of the royalty monetization.
bcrx_MilestonePaymentMaximum
Milestone Payment Maximum
Represents milestone payment maximum.
Royalty Monetization [Member]
Represents the royalty monetization transaction.
National Institute of Allergy and Infectious Diseases [Member]
Represents National Institute of Allergy and Infectious Diseases.
us-gaap_IncreaseDecreaseInInventories
Inventory
Trading Symbol
bcrx_CollaborativeAgreementContractCovenantMaximumAmountOfFunding
Collaborative Agreement Contract, Covenant, Maximum Amount of Funding
Represents collaborative agreement contract maximum amount if all contract options are exercised, to manufacture and evaluate the safety, efficacy and tolerability of galidesivir.
Employee stock purchase plan sales, shares (in shares)
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)
Local Phone Number
Exercise of stock options, shares (in shares)
Options outstanding, stock option awards exercised (in shares)
us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Line of Credit Facility, Remaining Borrowing Capacity
us-gaap_TableTextBlock
Notes Tables
Currency Hedge Agreement [Member]
Represents the Currency Hedge Agreement to hedge certain risks associated with changes in the value of the Japanese yen relative to the U.S. dollar.
Employee stock purchase plan
bcrx_AnnualLicenseFeeMinimum
Annual License Fee Minimum
Represent minimum annual license fee.
Exercise of stock options, net
bcrx_AnnualLicenseFeeMaximum
Annual License Fee Maximum
Represents annual maximum license fee.
Selling, general and administrative
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)
Options outstanding, stock option awards granted (in shares)
Line of Credit Facility, Lender [Domain]
Collaborative Arrangement and Arrangement Other than Collaborative [Domain]
Issuance of common stock, shares (in shares)
Stock Issued During Period, Shares, New Issues (in shares)
Lender Name [Axis]
bcrx_PercentageOfSalaryToPurchaseCommonStockMaximum
Percentage of Salary to Purchase Common Stock, Maximum
Represents percentage of salary to purchase common stock maximum.
bcrx_PercentageOfCommonStockSharesBeginning
Percentage of Common Stock Shares, Beginning
Represents percentage of common stock shares beginning.
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and stockholders’ equity
bcrx_PercentageOfCommonStockSharesEnding
Percentage of Common Stock Shares, Ending
Represents percentage of common stock shares ending.
Issuance of common stock, net
bcrx_ShareBasedCompensationArrangementBySharebasedPaymentAwardMaximumNumberOfSharesPerEmployeeAmount
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee, Amount
Represents share-based compensation arrangement by share-based payment award maximum value per employee amount.
Interest Expense and Royalty Financing Obligation [Policy Text Block]
Disclosure of accounting policy for interest expense and royalty financing obligation.
Accumulated deficit
Research and development
Accumulated other comprehensive income
Debt Disclosure [Text Block]
Cash and Cash Equivalents [Domain]
us-gaap_InterestExpense
Interest expense
us-gaap_InterestExpenseDebt
Interest Expense, Debt, Total
bcrx_OperatingLeaseRightofuseAssetAccumulatedAmortization
Operating Lease, Right-of-Use Asset, Accumulated Amortization
Amount of accumulated amortization on lessee's right to use underlying asset under operating lease.
bcrx_PeriodOfAgreement
Period of Agreement (Year)
Represents period of agreement.
Changes in operating assets and liabilities:
bcrx_RenewablePeriodOfAgreement
Renewable Period of Agreement (Year)
Represents renewable period of agreement.
Restricted Cash and Cash Equivalents [Axis]
us-gaap_NotesPayableFairValueDisclosure
Notes Payable, Fair Value Disclosure
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
Incentive Plan [Member]
Represents Incentive Plan.
Incentive Plan and Inducement Plan [Member]
Represents the incentive and inducement plans.
Employee Stock Purchase Plan [Member]
Employee stock purchase plan, (ESPP).
December 2019 [Member]
Represents award date of December 2019.
us-gaap_OperatingLeaseLiabilityNoncurrent
Operating Lease, Liability, Noncurrent
Subsequent Event [Member]
Royalty Monetization [Text Block]
Royalty monetization.
Schedule of Inventory, Current [Table Text Block]
bcrx_MaximumCustomaryReductionOnRoyaltyRate
Maximum Customary Reduction on Royalty Rate
The maximum percentage of customary reductions allowed on royalty rate.
Total
Non-cash paid in-kind interest on secured term loan
us-gaap_OperatingLeaseLiabilityCurrent
Operating Lease, Liability, Current
Subsequent Event Type [Axis]
bcrx_RoyaltyRateIfMaintainsSakigakeDesignation
Royalty Rate if Maintains Sakigake Designation
The percent of net sales that the company will receive if berotralstat maintains its Sakigake designation during the PMDA review.
Subsequent Event Type [Domain]
bcrx_PotentialMilestonePaymentsReceivableIfRegulatoryApprovalBeforeDecember312021
Potential Milestone Payments Receivable if Regulatory Approval Before December 31, 2021
The amount of potential milestone payments receivable if regulatory approval is granted before December 31, 2021.
Lease financing obligation
us-gaap_FinanceLeaseLiabilityNoncurrent
Lease financing obligation
bcrx_RoyaltyPaymentsReceivableExpirationTermFromFirstCommercial
Royalty Payments Receivable, Expiration Term From First Commercial (Year)
The expiration term of the royalty payments from first commercial date.
us-gaap_OperatingLeaseRightOfUseAsset
Operating Lease, Right-of-Use Asset
Awards available, stock option awards cancelled (in shares)
Share based compensation arrangement by share based payment award options forfeitures in period awards available.
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total lease payments
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Less imputed interest
2024
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree
2025
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour
2022
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
Debt Securities, Available-for-sale [Table Text Block]
2023
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
bcrx_PrivatePlacementOfSeniorSecuredNotes
Private Placement of Senior Secured Notes
Represents private placement of senior secured notes.
us-gaap_ShareBasedCompensation
Stock-based compensation expense
Other assets
2021
us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
Earnings Per Share, Policy [Policy Text Block]
bcrx_LongtermInvestmentMaturityMinimum
Long-term Investment Maturity, Minimum (Month)
Represents long term investment maturity minimum.
Comprehensive Income, Policy [Policy Text Block]
Income Tax, Policy [Policy Text Block]
JPR Royalty Sub LLC [Member]
Represents JPR Royalty Sub LLC.
Royalty Receivable [Member]
Represents royalty receivable.
PhaRMA Notes Member]
Represents PhaRMA notes.
us-gaap_LesseeOperatingLeaseTermOfContract
Lessee, Operating Lease, Term of Contract (Year)
Collateral for Credit [Member]
Restricted cash and cash equivalents required to maintain as collateral for a letter of credit.
Research and Development Expense, Policy [Policy Text Block]
RAPIVAB [Member]
Represents RAPIVAB product.
Depreciation and amortization
us-gaap_SharesIssuedPricePerShare
Shares Issued, Price Per Share (in dollars per share)
us-gaap_AssetsCurrent
Total current assets
Share-based Payment Arrangement [Policy Text Block]
Stockholders' Equity Note Disclosure [Text Block]
bcrx_MaturityPeriodOfHighQualityMarketablesecurities
Maturity Period of High Quality Marketable Securities (Year)
Represents maturity period of high quality marketable securities.
Accrued Interest
Represents the amount of accrued interest in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
Receivables
bcrx_ReceivablesPayablesNetCurrent
The total amount due to (from) the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable (payable), notes and loans receivable (payable), as well as any other types of receivables (payables), net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.
Advertising Cost [Policy Text Block]
Common stock, $0.01 par value: shares authorized - 450,000; shares issued and outstanding – 178,725 in 2021 and 176,883 in 2020
Adjustments to reconcile net loss to net cash used in operating activities:
Common stock, shares authorized (in shares)
Common stock, shares issued (in shares)
Certificates of Deposit [Member]
Common stock, par value (in dollars per share)
Statistical Measurement [Domain]
us-gaap_OperatingLeasePayments
Operating Lease, Payments
Maximum [Member]
Minimum [Member]
Product and Service [Axis]
Schedule of Receivables from Collaborations [Table Text Block]
Tabular disclosure representing receivables from collaborations.
Product and Service [Domain]
Statistical Measurement [Axis]
Litigation Case [Axis]
Litigation Case [Domain]
Preferred stock, $0.001 par value; shares authorized - 5,000; no shares issued and outstanding
CSL Limited [Member
Represents CSL Limited which is a company organized under the laws of Australia.
Preferred stock, shares issued (in shares)
Intangible Assets, Finite-Lived, Policy [Policy Text Block]
Lessee, Lease, Liability, Maturity [Table Text Block]
Tabular disclosure of undiscounted cash flows of both operating and finance lease liabilities. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating and finance lease liabilities recognized in statement of financial position.
Preferred stock, shares authorized (in shares)
Inventories
Total Inventory, net
Preferred stock, par value (in dollars per share)
us-gaap_ProceedsFromCollaborators
Proceeds from Collaborators
Work-in-process
Revenues
Revenue from Contract with Customer, Including Assessed Tax
us-gaap_InventoryValuationReserves
Reserves
Royalty
The amount of royalty expense (reversal of expense) during the period.
Amortization of debt issuance costs
The amount of increase (decrease) in amortization of debt issuance costs during the period.
Finished goods
Fair Value Hierarchy and NAV [Domain]
bcrx_ContractTerm
Contract Term (Year)
Period of time between the contract date and its expiration.
us-gaap_InventoryGross
Total Inventory
Fair Value, Inputs, Level 2 [Member]
Fair Value Hierarchy and NAV [Axis]
us-gaap_ProceedsFromLicenseFeesReceived
Proceeds from License Fees Received
Raw materials
Receivables
us-gaap_ReceivablesNetCurrent
us-gaap_PropertyPlantAndEquipmentUsefulLife
Property, Plant and Equipment, Useful Life (Year)
bcrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodAwardsAvailable
Awards available, stock option awards granted (in shares)
Represents share based compensation arrangement by share based payment award options grants in period awards available.
Operating activities
Revenue [Policy Text Block]
Statement [Line Items]
Furniture and Fixtures [Member]
Trade receivables
Additional paid-in capital
bcrx_ClassOfWarrantOrRightWarrantsIssuedPricePerWarrant
Class of Warrant or Right, Warrants Issued, Price Per Warrant (in dollars per share)
Per share or per unit amount of warrants issued.
Revenues:
AOCI Attributable to Parent [Member]
Stockholders’ equity:
Investments
Property, Plant and Equipment, Policy [Policy Text Block]
Warrants Issued in Public Offering [Member]
Represents warrants issued in public offering.
Long-Lived Tangible Asset [Axis]
Long-Lived Tangible Asset [Domain]
Description of Company [Policy Text Block]
The description of company policy.
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash, cash equivalents and restricted cash at beginning of period
Cash, cash equivalents and restricted cash at end of period
Inventory, Policy [Policy Text Block]
Assets
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
(Decrease) increase in cash, cash equivalents and restricted cash
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash provided by (used in) financing activities
Accrued Expenses [Policy Text Block]
Represents accrued expenses policy.
Effect of exchange rate on cash and cash equivalents
Interest Expense and Deferred Financing Costs [Policy Text Block]
Represents interest expense and deferred financing costs.
Currency Hedge Agreement [Policy Text Block]
Represents currency hedge agreement policy.
us-gaap_OperatingIncomeLoss
Loss from operations
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash used in operating activities
Concentration of Market Risk [Policy Text Block]
Represents concentration of market risk policy.
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash provided by investing activities
Prepaid expenses and other current assets
Cost of product sales
Counterparty Name [Axis]
Counterparty Name [Domain]
us-gaap_InterestPayableCurrentAndNoncurrent
Interest Payable
Investment, Policy [Policy Text Block]
us-gaap_PaymentsOfDebtExtinguishmentCosts
Payment for Debt Extinguishment or Debt Prepayment Cost
MidCap Financial Services, LLC [Member]
Represents MidCap Financial Services, LLC entity.
bcrx_AmortizationOfDebtFinancingCostsAndOriginalIssueDiscounts
Amortization of Debt Financing Costs and Original Issue Discounts
The amount of amortization of debt financing costs and original issue discounts.
Senior Credit Facility [Member]
Represents senior credit facility. Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.
us-gaap_CostsAndExpenses
Total operating expenses
Inducement Plan [Member]
Related to the Inducement Plan.
us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Proceeds from Issuance or Sale of Equity, Total
us-gaap_AccruedRoyaltiesCurrentAndNoncurrent
Accrued Royalties
Expenses
Cost of Goods and Service [Policy Text Block]
Scenario [Domain]
Sale of pre-funded warrants
Retained Earnings [Member]
Net proceeds from common stock issued under stock-based compensation plans
Mundipharma [Member]
Information pertaining to Mundipharma.
Sale of common stock, net
Scenario [Axis]
Milestone [Member]
Information related to milestone.
Additional Paid-in Capital [Member]
Common Stock [Member]
bcrx_PercentageOfCarryingAmountInExcessOfFairValue1
Percentage of Carrying Amount in Excess of Fair Value
Represents the percentage of carrying amount in excess of fair value.
Equity Components [Axis]
Equity Component [Domain]
Royalty Receivables from Partners [Member]
Information related to royalty receivables from partners.
Other Noncurrent Assets [Member]
us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)
Class of Warrant or Right [Axis]
Other Noncurrent Liabilities [Member]
Class of Warrant or Right [Domain]
us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)
Deferred revenue
Vest Upon Successful Completion of Specific Development Milestones [Member]
Represents vesting upon successful completion of specific development milestones.
August 2013 [Member]
Represents award date of August 2013.
Vest 25% Each Year Until Fully Vested [Member]
Represents vest 25% each year until fully vested.
us-gaap_DeferredFinanceCostsNet
Debt Issuance Costs, Net, Total
us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net, Total
us-gaap_SecuredDebt
Secured Debt, Total
Disaggregation of Revenue [Table Text Block]
us-gaap_RepaymentsOfLongTermDebt
Repayments of Long-term Debt, Total
ORLADEYO [Member]
Represents ORLADEYO.
Interest and other income
The amount of interest income and other income (loss) recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income (loss) from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business).
Annual Net Sales Under $350,000 [Member]
Represents annual net sales under $350,000.
Annual Net Sales Between $350,000 and $550,000 [Member]
Represents annual net sales between $350,000 and $550,000.
Annual Net Sales Over $550,000 [Member]
Represents annual net sales over $550,000.
Computer Equipment [Member]
bcrx_RoyaltyPurchaseAgreementRoyaltiesPercentageOfGlobalAnnualNetSales
Royalty Purchase Agreement, Royalties, Percentage of Global Annual Net Sales
The percentage of global annual net sales of royalties to be paid under the royalty purchase agreement.
Cash and Cash Equivalents, Policy [Policy Text Block]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]
Document Quarterly Report
Receivable [Policy Text Block]
bcrx_RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInKeyTerritories
Royalty Purchase Agreement, Royalties, Percentage of Annual Net Sales in Key Territories
The percentage of net sales in key territories for royalties to be paid under the royalty purchase agreement.
Entity Incorporation, State or Country Code
Annual Net Sales Between $150,000 and $230,000 [Member]
Represents annual net sales between $150,000 and $230,000.
Annual Net Sales Over $230,000 [Member]
Represents annual net sales over $230,000.
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]
Document Transition Report
Basis of Accounting, Policy [Policy Text Block]
BCX9930 [Member]
Represents BCX9930.
bcrx_RoyaltyPurchaseAgreementRoyaltiesPercentageOfSublicenseRevenueInOtherMarkets
Royalty Purchase Agreement, Royalties, Percentage of Sublicense Revenue in Other Markets
The percentage of sublicense revenue in other markets of royalties to be paid under the royalty purchase agreement.
bcrx_RoyaltyPurchaseAgreementRoyaltiesPercentageOfAnnualNetSalesInOtherMarkets
Royalty Purchase Agreement, Royalties, Percentage of Annual Net Sales in Other Markets
The percentage of annual net sales in other markets of royalties to be paid under the royalty purchase agreement.
Selling, General and Administrative Expenses [Member]
Entity Interactive Data Current
Annual Net Sales Under $150,000 [Member]
Represents annual net sales under $150,000.
Term A Loan [Member]
Represents term A loan.
Term B Loan [Member]
Represents term B loan.
Term C Loan [Member]
Represents term C loan.
Future Royalties Payable [Member]
Represents future royalties payable.
Security Exchange Name
Royalty financing obligation
Future Royalties Payable
Carrying amount as of the balance sheet date of obligations for future royalties.
Credit Agreement [Member]
Represents the credit agreement.
Title of 12(b) Security
Athyrium [Member]
Represents Athyrium Opportunities III Co-Invest 1 LP (“Athyrium”).
bcrx_DebtInstrumentLiborFloor
Debt Instrument, LIBOR Floor
Minimum LIBOR interest rate for debt instrument.
us-gaap_ProceedsFromIssuanceOfLongTermDebt
Proceeds from Issuance of Long-term Debt, Total
bcrx_DebtInstrumentLiborCap
Debt Instrument, LIBOR Cap
Maximum LIBOR interest rate for debt instrument.
Receivable Type [Axis]
Receivable [Domain]
Trade Accounts Receivable [Member]
PIK Interest Payment is Made [Member]
Represents PIK interest payment is made.
Other Income [Member]
bcrx_DebtInstrumentPrepaymentFeePercentageOfAccruedInterest
Debt Instrument, Prepayment Fee, Percentage of Accrued Interest
The percentage of interest that would have accrued on principal voluntary paid for prepayment fee of the debt instrument.
Billing Status, Type [Axis]
After Fourth Anniversary [Member]
Represents after the fourth anniversary.
Receivables Billing Status [Domain]
Between the Third and Fourth Anniversaries [Member]
Represents after the third anniversary and before the fourth anniversary.
Unbilled Revenues [Member]
Billed Revenues [Member]
us-gaap_ProceedsFromIssuanceOfSecuredDebt
Proceeds from Issuance of Secured Debt
bcrx_DebtInstrumentPrepaymentFeePercentageOfPrincipalVoluntaryPayments
Debt Instrument, Prepayment Fee, Percentage of Principal Voluntary Payments
The percentage of principal paid voluntarily for prepayment fee of the debt instrument.
Income Statement Location [Axis]
Income Statement Location [Domain]
Warrants issued (in shares)
The number of warrants or rights issued during period.
Collaborative Arrangement and Arrangement Other than Collaborative [Axis]
Legal Entity of Counterparty, Type [Axis]
Legal Entity Type of Counterparty [Domain]
Between the Second and Third Anniversaries [Member]
Represents between the second and third anniversaries.
Prior to the Second Anniversary [Member]
Represents prior to the second anniversary.
Collaborative Arrangement Disclosure [Text Block]
bcrx_DebtInstrumentCovenantMinimumUnrestrictedCashAndCashEquivalents
Debt Instrument, Covenant, Minimum Unrestricted Cash and Cash Equivalents
The minimum amount of unrestricted cash and cash equivalents required under the covenant of the debt instrument.
Term Loan A Drawn [Member]
Represents term loan A drawn.
Term Loan A and B Drawn [Member]
Represents term loan A and B drawn.
Term Loans A, B and C Drawn [Member]
Represents term loans A, B and C drawn.
bcrx_DebtInstrumentExitFeePercentageOfPrincipal
Debt Instrument, Exit Fee, Percentage of Principal
The percentage of principal for exit fee of the debt instrument.
Accrued Liabilities, Current and Other Noncurrent Liabilities [Member]
Information pertaining to accrued liabilities, current and other noncurrent liabilities.
bcrx_DebtInstrumentCommitmentFeePercentage
Debt Instrument, Commitment Fee Percentage
The commitment fee percentage of the debt instrument.
Term Loans A, B and C Drawn and Cure Right Exercised [Member]
Represents term loans A, B and C drawn and the Cure Right has been exercised.
us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)
us-gaap_RepaymentsOfLinesOfCredit
Repayments of Lines of Credit
Weighted average shares outstanding (in shares)
Basic and diluted net loss per common share (in dollars per share)
RPI 2019 Intermediate Finance Trust [Member]
Represents RPI 2019 Intermediate Finance Trust (RPI)..
Statement [Table]
Statement of Financial Position [Abstract]
Statement of Cash Flows [Abstract]
bcrx_UpfrontPaymentsReceivableAmount
Upfront Payments Receivable Amount
Represents upfront payments receivable.
bcrx_PotentialMilestonePaymentsReceivable
Potential Milestone Payments Receivable
Represents potential milestone payments receivable based on possibility of future event payments.
Statement of Stockholders' Equity [Abstract]
Income Statement [Abstract]
Collaborative and Other Research and Development [Member]
Information pertaining to Collaborative and other research and development.
Non-cash interest expense on royalty financing obligation
Amount of non-cash interest expense on royalty financing obligation.
us-gaap_ProceedsFromIssuanceOfDebt
Proceeds from Issuance of Debt
Laboratory Equipment, Office Equipment and Software [Member]
Information pertaining to laboratory equipment, office equipment and software.
us-gaap_GovernmentContractReceivable
Government Contract Receivable
Other Commitments [Axis]
Other Commitments [Domain]
Financing activities
bcrx_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedForRemainderOfFiscalYear
Employee Service Share-based Compensation Nonvested Awards Compensation Cost Expected to be Recognized For Remainder of Fiscal Year
Employee service share based compensation nonvested awards compensation cost expected to be recognized for remainder of fiscal year.
Research and Development Arrangement, Contract to Perform for Others, Type [Axis]
bcrx_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearTwo
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Expected to be Recognized Year Two
Employee service share based compensation nonvested awards compensation cost expected to be recognized year two.
Research and Development Arrangement, Contract to Perform for Others, Type [Domain]
bcrx_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearThree
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Expected to be Recognized Year Three
Employee service share based compensation nonvested awards compensation cost expected to be recognized year three.
Torii Pharmaceutical Co. [Member]
Information related to Torii Pharmaceutical Co., Ltd.
bcrx_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostExpectedToBeRecognizedYearFour
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Expected to be Recognized Year Four
Employee service share based compensation nonvested awards compensation cost expected to be recognized year four.
us-gaap_StockholdersEquity
Total stockholders’ equity
Balance
Balance
Class of Stock [Axis]
Secured term loan
us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Gross Unrealized Losses
Gross Unrealized Gains
Amortized Cost
us-gaap_DerivativeForwardExchangeRate1
Derivative, Forward Exchange Rate (in JPY per USD)