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Condensed Consolidated Financial Statements - Narrative (Details) $ in Millions	May 13, 2011 USD ($)
BARDA Contract
Procurement Contract [Line Items]
Reduced holdback amount	$ 41

X

- Definition

Procurement Contract [Line Items]

+ References

No definition available.

+ Details

Name:	siga_ProcurementContractLineItems
Namespace Prefix:	siga_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reduced holdback be received from BARDA

+ References

No definition available.

+ Details

Name:	siga_Reducedholdbackamount
Namespace Prefix:	siga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	siga_ProcurementContractAxis=siga_BardaContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: