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Note 13 Subsequent Even (Details Textual) - Subsequent Event [Member] - Merger Agreement [Member] | Jan. 21, 2018
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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
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Balance Type: | na
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X
- Definition Ratio applied to the conversion of Idera common stock into common stock of Holdco. + References No definition available. + Details
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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
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X
- Details
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Period Type: |

X
- Details
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X
- Details
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X
- Details
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X
- Details
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Namespace Prefix: |
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