Condensed Consolidated Financial Statements	3 Months Ended
Mar. 31, 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 months ended March 31, 2018 are not necessarily indicative of the results expected for the full year. Liquidity The accompanying 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. The Company is not entitled to receive additional procurement-related payments under the current BARDA Contract (Note 3) if and until United States Food & Drug Administration ("FDA") approval of TPOXX® has been achieved, and there is no difference between the approved product and courses of TPOXX® that have been delivered to the U.S. Strategic National Stockpile (“Strategic Stockpile”). Upon meeting the aforementioned requirements, a determination of which is currently expected in the third quarter of 2018, the Company will be entitled to a $41 million hold back payment under the BARDA Contract. In the event that the Company does not receive a substantial portion of the hold back payment, or other substantial cash inflows, by October of 2018, then, based on currently forecasted operating costs, the Company will require additional sources of funding to continue operations and prevent an event of default under the term loan (Note 8). In this case, the Company would seek to increase cash liquidity by: raising proceeds through a financing, entering into a new contract for TPOXX® or any other product, a sale of assets, or the modification of the existing BARDA Contract; significantly reducing its operating expenses; or modifying the terms of the Term Loan Agreement. There can be no assurance that TPOXX® will receive FDA approval on a timely basis, if at all, or that there will be no difference between the approved product and courses of TPOXX® that have been delivered to the Strategic Stockpile. Furthermore, there can be no assurance that the Company would be able to increase cash liquidity, if needed, through a financing, a new contract for TPOXX® or any other product, a sale of assets, the modification of the existing BARDA Contract, or a significant reduction of its operating expenses or operations, or that the lenders would agree to modify the Term Loan Agreement, if needed. Because of these conditions, substantial doubt exists about the Company's ability to continue as a going concern for one year from the financial statement issuance date.

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 months ended March 31, 2018 are not necessarily indicative of the results expected for the full year.

Liquidity

The accompanying 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. The Company is not entitled to receive additional procurement-related payments under the current BARDA Contract (Note 3) if and until United States Food & Drug Administration ("FDA") approval of TPOXX® has been achieved, and there is no difference between the approved product and courses of TPOXX® that have been delivered to the U.S. Strategic National Stockpile (“Strategic Stockpile”). Upon meeting the aforementioned requirements, a determination of which is currently expected in the third quarter of 2018, the Company will be entitled to a $41 million hold back payment under the BARDA Contract.

In the event that the Company does not receive a substantial portion of the hold back payment, or other substantial cash inflows, by October of 2018, then, based on currently forecasted operating costs, the Company will require additional sources of funding to continue operations and prevent an event of default under the term loan (Note 8). In this case, the Company would seek to increase cash liquidity by: raising proceeds through a financing, entering into a new contract for TPOXX® or any other product, a sale of assets, or the modification of the existing BARDA Contract; significantly reducing its operating expenses; or modifying the terms of the Term Loan Agreement. There can be no assurance that TPOXX® will receive FDA approval on a timely basis, if at all, or that there will be no difference between the approved product and courses of TPOXX® that have been delivered to the Strategic Stockpile. Furthermore, there can be no assurance that the Company would be able to increase cash liquidity, if needed, through a financing, a new contract for TPOXX® or any other product, a sale of assets, the modification of the existing BARDA Contract, or a significant reduction of its operating expenses or operations, or that the lenders would agree to modify the Term Loan Agreement, if needed. Because of these conditions, substantial doubt exists about the Company's ability to continue as a going concern for one year from the financial statement issuance date.