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Stockholders' Equity Textual (Details) | Oct. 23, 2023 shares
--- | ---
Common Stock |
Subsidiary, Sale of Stock [Line Items] |
Stock issued during period (in shares) | 14,997,000

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- Definition Stock Issued During Period, Shares, Warrants Exercised + References No definition available. + Details
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Namespace Prefix: | bcrx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |