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Note 6 - Stockholders' Equity (Details Textual) $ in Billions	Nov. 08, 2017 USD ($)
Maximum Aggregate Offering Price	$ 0.2

X

- Definition

Represents the maximum aggregate offering price of common stock, preferred stock, depository shares, stock purchase contracts, warrants and units.

+ References

No definition available.

+ Details

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