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Lease Obligations - Aggregate Lease Expense Under Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Aggregate lease expense	$ 1,014	$ 634	$ 2,505	$ 1,854

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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