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Summary of Significant Accounting Policies (Revenue) (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014
Accounting Policies [Abstract] |  |  |
Revenue, percentage | 100.00% | 100.00% | 100.00%

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- Definition Percentage of revenue represented from National Institutes of Health and BARDA. + References No definition available. + Details
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Namespace Prefix: | siga_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration