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Note 5 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, shares in Thousands		1 Months Ended	12 Months Ended
	Jun. 03, 2014	Aug. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 03, 2015	Jun. 30, 2014	Nov. 06, 2013	Jul. 13, 2011
Maximum Aggregate Offering Price							$ 150,000,000		$ 125,000,000
Issuance of common stock, shares (in shares)	11,500	4,600			2,883	4,516
Proceeds from Issuance of Common Stock	$ 115,000,000	$ 18,500,000		$ 106,600,000	$ 23,633,000	$ 17,805,000
Proceeds from Issuance or Sale of Equity	$ 107,800,000
Remaining Aggregate Offering Price									$ 10,000,000
Share Price		$ 4.40			$ 1.85	$ 4.08
Stock Issued During Period Shares for over Allotment Option Exercised by Underwriter		600
Common Stock to be Issued, Value								$ 70,000,000
Common Stock, Value, Issued			$ 734,000	$ 720,000						$ 70,000,000
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options					$ 5,218,000

X

- Definition

Represents the value of equity to be issued.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

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

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Namespace Prefix:	bcrx_
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Balance Type:	credit
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X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
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Balance Type:	credit
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X

- Definition

Represents stock issued during period shares for over allotment option exercised by underwriter.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
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X

- Definition

Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

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X

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

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Balance Type:	debit
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X

- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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X

- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

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Balance Type:	debit
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X

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

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X

- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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