XML 13 R1.htm IDEA: XBRL DOCUMENT v3.21.2
Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2021
Oct. 20, 2021
Document Information [Line Items]    
Entity Central Index Key 0001010086  
Entity Registrant Name Siga Technologies INC  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2021  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2021  
Document Transition Report false  
Entity File Number 0-23047  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 13-3864870  
Entity Address, Address Line One 31 East 62nd Street  
Entity Address, Postal Zip Code 10065  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
City Area Code 212  
Local Phone Number 672-9100  
Title of 12(b) Security common stock, $.0001 par value  
Trading Symbol SIGA  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   74,116,295