Lease Obligations - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
2024 (remaining)	$ 1,589
2025	1,850
2026	1,661
2027	1,584
2028	1,416
Thereafter	7,997
Total lease payments	16,097
Less imputed interest	(6,403)
Total	9,694	$ 9,448
Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
2024 (remaining)	1,418
2025	1,766
2026	933
2027	459
2028	31
Thereafter	0
Total lease payments	4,607
Less imputed interest	(459)
Total	$ 4,148	$ 4,435

Finance Lease, Liability, to be Paid, After Year Four

No definition available.

Name:	bcrx_FinanceLeaseLiabilityToBePaidAfterYearFour
Namespace Prefix:	bcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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).

+ References

No definition available.