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Condensed Consolidated Financial Statements - Narrative (Details) - USD ($) $ in Millions	Jul. 31, 2018	May 13, 2011
BARDA Contract
Procurement Contract [Line Items]
Reduced holdback amount		$ 41.0
Subsequent Event
Procurement Contract [Line Items]
Contract value, option, FDA approval	$ 50.0

X

- Definition

Contract value of option exercisable, FDA approval for extension to 84-month expiry for Tecovirimat, at BARDA's discretion.

+ References

No definition available.

+ Details

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

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:

X

- Details

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