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Note 13 Subsequent Even (Details Textual) - Subsequent Event [Member] - Merger Agreement [Member]	Jan. 21, 2018
Idera Exchange Ratio	0.2
BioCryst Exchange Ratio	0.5
Baker Brother [Member] | BioCryst [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	14.00%
Baker Brother [Member] | Idera [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	9.00%

X

- Definition

Ratio applied to the conversion of BioCryst common stock into common stock of Holdco.

+ References

No definition available.

+ Details

Name:	bcrx_BioCrystExchangeRatio
Namespace Prefix:	bcrx_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Ratio applied to the conversion of Idera common stock into common stock of Holdco.

+ References

No definition available.

+ Details

Name:	bcrx_IderaExchangeRatio
Namespace Prefix:	bcrx_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=bcrx_MergerAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CounterpartyNameAxis=bcrx_BakerBrotherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OwnershipAxis=bcrx_BiocrystMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OwnershipAxis=bcrx_IderaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: