Condensed Consolidated Financial Statements	6 Months Ended
Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Consolidated Financial Statements	Condensed Consolidated Financial Statements The financial statements are presented in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and the rules and regulations of the Securities and Exchange Commission (the “SEC”) for quarterly reports on Form 10-Q and should be read in conjunction with the Company’s audited financial statements and notes thereto for the year ended December 31, 2017, included in the 2017 Annual Report on Form 10-K. All terms used but not defined elsewhere herein have the meaning ascribed to them in the Company’s 2017 Annual Report on Form 10-K filed on March 6, 2018. In the opinion of management, all adjustments (consisting of normal and recurring adjustments) considered necessary for a fair statement of the results of the interim periods presented have been included. The 2017 year-end condensed balance sheet data was derived from the audited financial statements but does not include all disclosures required by U.S. GAAP. The results of operations for the three and six months ended June 30, 2018 are not necessarily indicative of the results expected for the full year. Liquidity The accompanying condensed consolidated financial statements have been prepared assuming that the Company will continue as a going concern and contemplate the realization of assets and the satisfaction of liabilities in the normal course of business. On July 13, 2018, the United States Food & Drug Administration (“FDA”) approved the Company’s orally-administered drug TPOXX® (“oral TPOXX®”) for the treatment of smallpox. There is no difference between the approved product and courses of oral TPOXX® that have been delivered to the U.S. Strategic National Stockpile (“Strategic Stockpile”). As such, the Company received $41 million that previously had been held back under the U.S. Biomedical Advanced Research and Development Authority (“BARDA”) Contract (see Note 3). Accordingly, management believes, based on currently forecasted operating costs that the Company will continue as a going concern for more than one year from the issuance date of these financial statements. Additionally, the Company invoiced BARDA for $50 million on July 31, 2018 and payment is due in August for a modification made to the BARDA Contract, in which BARDA exercised its option for a $50 million payment to the Company relating to FDA approval of 84-month expiry for oral TPOXX®. Priority Review Voucher Concurrent with the approval of oral TPOXX®, FDA granted the Company's request for a Priority Review Voucher (“PRV”). A PRV is a voucher that may be used to obtain an accelerated FDA review of future SIGA products or sold to a third party to obtain accelerated review of one of its future products.

Condensed Consolidated Financial Statements

The financial statements are presented in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and the rules and regulations of the Securities and Exchange Commission (the “SEC”) for quarterly reports on Form 10-Q and should be read in conjunction with the Company’s audited financial statements and notes thereto for the year ended December 31, 2017, included in the 2017 Annual Report on Form 10-K. All terms used but not defined elsewhere herein have the meaning ascribed to them in the Company’s 2017 Annual Report on Form 10-K filed on March 6, 2018. In the opinion of management, all adjustments (consisting of normal and recurring adjustments) considered necessary for a fair statement of the results of the interim periods presented have been included. The 2017 year-end condensed balance sheet data was derived from the audited financial statements but does not include all disclosures required by U.S. GAAP. The results of operations for the three and six months ended June 30, 2018 are not necessarily indicative of the results expected for the full year.

Liquidity

The accompanying condensed consolidated financial statements have been prepared assuming that the Company will continue as a going concern and contemplate the realization of assets and the satisfaction of liabilities in the normal course of business. On July 13, 2018, the United States Food & Drug Administration (“FDA”) approved the Company’s orally-administered drug TPOXX® (“oral TPOXX®”) for the treatment of smallpox. There is no difference between the approved product and courses of oral TPOXX® that have been delivered to the U.S. Strategic National Stockpile (“Strategic Stockpile”). As such, the Company received $41 million that previously had been held back under the U.S. Biomedical Advanced Research and Development Authority (“BARDA”) Contract (see Note 3). Accordingly, management believes, based on currently forecasted operating costs that the Company will continue as a going concern for more than one year from the issuance date of these financial statements. Additionally, the Company invoiced BARDA for $50 million on July 31, 2018 and payment is due in August for a modification made to the BARDA Contract, in which BARDA exercised its option for a $50 million payment to the Company relating to FDA approval of 84-month expiry for oral TPOXX®.

Priority Review Voucher

Concurrent with the approval of oral TPOXX®, FDA granted the Company's request for a Priority Review Voucher (“PRV”). A PRV is a voucher that may be used to obtain an accelerated FDA review of future SIGA products or sold to a third party to obtain accelerated review of one of its future products.