Lease Obligations - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
2024 (remaining)	$ 1,028
2025	1,849
2026	1,660
2027	1,584
2028	1,416
Thereafter	7,997
Total lease payments	15,534
Less imputed interest	(6,146)
Total	9,388	$ 9,448
Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
2024 (remaining)	953
2025	1,782
2026	948
2027	474
2028	38
Thereafter	0
Total lease payments	4,195
Less imputed interest	(397)
Total	$ 3,798	$ 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.