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Lease Obligations - Aggregate Lease Expense Under Operating Leases (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Leases [Abstract] |  |  |  |
Aggregate lease expense | $ 634 | $ 393 | $ 1,854 | $ 1,306

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- Definition Aggregate Lease Expense + References No definition available. + Details
Name: | bcrx_AggregateLeaseExpense
Namespace Prefix: | bcrx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration