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Note 4 - Royalty Monetization (Details Textual) $ in Thousands			6 Months Ended
	May 18, 2016 USD ($)	Mar. 09, 2011 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	May 18, 2016 JPY (¥)
Currency Hedge Agreement [Member]
Collateral Already Posted, Aggregate Fair Value			$ 0		$ 0
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative, Loss on Derivative			$ 1,943	$ 6,441
PhaRMA Notes Member] | Currency Hedge Agreement [Member]
Payments for (Proceeds from) Hedge, Investing Activities	$ 1,950
Required Foreign Currency Hedge Per Dollar | ¥						¥ 100
PhaRMA Notes Member] | Japan, Yen | Currency Hedge Agreement [Member]
Derivative, Forward Exchange Rate			100
JPR Royalty Sub LLC [Member] | PhaRMA Notes Member]
Private Placement of Senior Secured Notes		$ 30,000
Debt Instrument, Interest Rate, Stated Percentage		14.00%
Percentage of Carrying Amount in Excess of Fair Value			50.00%
JPR Royalty Sub LLC [Member] | PhaRMA Notes Member] | Currency Hedge Agreement [Member]
Collateral Already Posted, Aggregate Fair Value			$ 0	$ 0
Maximum Amount of Collateral Required to Post			5,850
JPR Royalty Sub LLC [Member] | PhaRMA Notes Member] | Fair Value, Inputs, Level 2 [Member]
Notes Payable, Fair Value Disclosure			$ 30,000
JPR Royalty Sub LLC [Member] | Royalty Monetization [Member]
Revenue Recognition Royalty and Milestone Revenue Recognized		$ 30,000
Revenue Recognition Royalty And Milestone Revenue Recognized, Net		22,691
Transaction Costs		4,309
Interest Reserve		$ 3,000

X

- Definition

Represents interest reserve established as part of the royalty monetization.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents maximum amount of collateral required to post.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Represents the percentage of carrying amount in excess of fair value.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents private placement of senior secured notes.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

The Company is required to maintain a foreign currency hedge per dollar under the agreements governing the PhaRMA Notes.

+ References

No definition available.

+ Details

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X

- Definition

Represents revenue recognition royalty and milestone revenue recognized, net.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Revenue recognition royalty and milestone revenue recognized.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Represents transaction costs associated with royalty monetization.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (d)
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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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X

- Definition

Contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

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Data Type:	xbrli:pureItemType
Balance Type:	na
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X

- Definition

Amount of decrease in the fair value of derivatives recognized in the income statement.

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X

- Definition

Fair value portion of notes payable.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
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Balance Type:	credit
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X

- Definition

The cash outflow or inflow for a financial contract that meets the hedge criteria as either a cash flow hedge, fair value hedge, or hedge of a net investment in a foreign operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Details

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- Details

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