Procurement Contract and Research Agreements	3 Months Ended
Mar. 31, 2018
Research and Development [Abstract]
Procurement Contract and Research Agreements	Procurement Contract and Research Agreements On May 13, 2011, the Company signed a contract with the U.S. Biomedical Advanced Research and Development Authority (“BARDA”) pursuant to which SIGA agreed to deliver two million courses of TPOXX® to the Strategic Stockpile. The contract with BARDA (as amended, modified, or supplemented from time to time, the “BARDA Contract”) includes a base contract (“Base Contract”) as well as options (described below). The Base Contract contemplates approximately $472.3 million of payments, of which $409.8 million is consideration for the manufacture and delivery of 1.7 million courses of TPOXX® and $62.5 million is available for certain development and supportive activities. Under the Base Contract, BARDA agreed to buy from the Company 1.7 million courses of TPOXX®. Additionally, the Company agreed to contribute to BARDA 300,000 courses at no additional cost to BARDA. The delivery of 2.0 million courses of TPOXX® to the Strategic Stockpile is a requirement in order for the Company to be eligible to receive a $41 million hold back payment (see description of hold back payment below). For courses of TPOXX® that are physically delivered to the Strategic Stockpile, the Company has a product replacement obligation, at no cost to BARDA, in the event that the final version of TPOXX® approved by the FDA is different from any courses of TPOXX® that have been delivered to the Strategic Stockpile or if TPOXX® does not meet any specified label claims, fails release testing or does not meet the 38-month expiry period (from time of delivery to the Strategic Stockpile), or if TPOXX® is recalled or deemed to be recalled for any reason (the "Replacement Obligation"). As of March 31, 2018, the Company has received $368.9 million under the Base Contract related to the manufacture and physical delivery of courses of TPOXX®. Included in this amount are a $41.0 million advance payment in 2011 for the completion of certain planning and preparatory activities related to the Base Contract; a $12.3 million milestone payment in 2012 for the completion of the product labeling strategy for TPOXX®; an $8.2 million milestone payment in 2013 for the completion of the commercial validation campaign for TPOXX®; a $20.5 million payment in 2016 for submission of documentation to BARDA indicating that data covering the first 100 subjects enrolled in the phase III pivotal safety study had been submitted to and reviewed by a Data Safety and Monitoring Board (“DSMB”) and that such DSMB had recommended continuation of the safety study, as well as submission of the final pivotal rabbit efficacy study report to the FDA; and $286.9 million of payments for physical deliveries of TPOXX® to the Strategic Stockpile beginning in 2013. The Company has cumulatively delivered 2.0 million courses of TPOXX® to the Strategic Stockpile. The dosage of courses delivered is 600 mg administered twice per day (1,200 mg per day). In February 2016, the FDA confirmed (through dose concurrence) its earlier dosage guidance of 600 mg administered twice per day (1,200 mg per day). Courses delivered to the Strategic Stockpile are currently subject to the Replacement Obligation (as discussed above). The Company is eligible under the Base Contract to receive a $41 million hold back payment, which represents an approximate 10% hold back on the $409.8 million of total payments related to the manufacture and delivery of 1.7 million courses of TPOXX® under the Base Contract. The $41 million hold back payment would be triggered by FDA approval of TPOXX®, provided that the Company no longer has the Replacement Obligation to BARDA. In addition to the Base Contract, the BARDA Contract also includes remaining options that, if all were exercised by BARDA, would result in aggregate payments to the Company of $122.7 million, including: a $50.0 million payment to the Company in the event of FDA approval for extension to 84-month expiry for TPOXX® (from 38-month expiry as required in the Base Contract); up to $58.3 million of funding for development and supportive activities such as work on a smallpox prophylaxis indication for TPOXX®; and/or $14.4 million of funding for production-related activities related to warm-base manufacturing. In 2015, BARDA exercised two options related to extending the indication of the drug to the geriatric and pediatric populations. The stated value of these exercises was minimal. BARDA, in its sole discretion, may choose not to exercise unexercised options. However, BARDA has indicated that it will evaluate, after the FDA’s review and evaluation of stability data, the Company's request that BARDA exercise the option for the $50.0 million payment to the Company in the event of FDA approval of 84-month expiry for TPOXX®. The BARDA Contract expires in September 2020. As described in Note 2, cash inflows related to delivery of courses are recorded as deferred revenue due to the constraint on the consideration received. As of March 31, 2018, the Company recorded $375.5 million of deferred revenue in connection with the BARDA contract (of which $368.9 million relates to the manufacture and delivery of 1.7 million courses of TPOXX® and the remainder relates to supportive activities). Deferred revenue under the BARDA Contract is classified as a long-term liability since there can be no assurance that the Replacement Obligation under the BARDA contract will be reasonably satisfied within twelve months. In addition, direct costs incurred by the Company to fulfill the delivery of courses, including the supplementing of courses previously delivered under the BARDA Contract, are being deferred and will be recognized as expenses in the period of the FDA’s approval of the final version of TPOXX® (quantification and specification of the Replacement Obligation) has occurred. As of March 31, 2018 and December 31, 2017, deferred direct costs under the BARDA Contract of approximately $94.3 million and $96.5 million, respectively, are included in deferred costs on the condensed consolidated balance sheets. Research Agreements and Grants The Company has an R&D program for the intravenous (IV) formulation of TPOXX®. This program is funded by a development contract with BARDA ("IV Formulation R&D Contract"). This contract has a period of performance that terminates on December 30, 2020. Contracts and grants include, among other things, options that may or may not be exercised at BARDA’s discretion. Moreover, contracts and grants contain customary terms and conditions including BARDA’s right to terminate or restructure a contract or grant for convenience at any time. As such, we may not be able to utilize all available funds.

Procurement Contract and Research Agreements

On May 13, 2011, the Company signed a contract with the U.S. Biomedical Advanced Research and Development Authority (“BARDA”) pursuant to which SIGA agreed to deliver two million courses of TPOXX® to the Strategic Stockpile. The contract with BARDA (as amended, modified, or supplemented from time to time, the “BARDA Contract”) includes a base contract (“Base Contract”) as well as options (described below). The Base Contract contemplates approximately $472.3 million of payments, of which $409.8 million is consideration for the manufacture and delivery of 1.7 million courses of TPOXX® and $62.5 million is available for certain development and supportive activities.

Under the Base Contract, BARDA agreed to buy from the Company 1.7 million courses of TPOXX®. Additionally, the Company agreed to contribute to BARDA 300,000 courses at no additional cost to BARDA. The delivery of 2.0 million courses of TPOXX® to the Strategic Stockpile is a requirement in order for the Company to be eligible to receive a $41 million hold back payment (see description of hold back payment below).

For courses of TPOXX® that are physically delivered to the Strategic Stockpile, the Company has a product replacement obligation, at no cost to BARDA, in the event that the final version of TPOXX® approved by the FDA is different from any courses of TPOXX® that have been delivered to the Strategic Stockpile or if TPOXX® does not meet any specified label claims, fails release testing or does not meet the 38-month expiry period (from time of delivery to the Strategic Stockpile), or if TPOXX® is recalled or deemed to be recalled for any reason (the "Replacement Obligation").

As of March 31, 2018, the Company has received $368.9 million under the Base Contract related to the manufacture and physical delivery of courses of TPOXX®. Included in this amount are a $41.0 million advance payment in 2011 for the completion of certain planning and preparatory activities related to the Base Contract; a $12.3 million milestone payment in 2012 for the completion of the product labeling strategy for TPOXX®; an $8.2 million milestone payment in 2013 for the completion of the commercial validation campaign for TPOXX®; a $20.5 million payment in 2016 for submission of documentation to BARDA indicating that data covering the first 100 subjects enrolled in the phase III pivotal safety study had been submitted to and reviewed by a Data Safety and Monitoring Board (“DSMB”) and that such DSMB had recommended continuation of the safety study, as well as submission of the final pivotal rabbit efficacy study report to the FDA; and $286.9 million of payments for physical deliveries of TPOXX® to the Strategic Stockpile beginning in 2013.

The Company has cumulatively delivered 2.0 million courses of TPOXX® to the Strategic Stockpile. The dosage of courses delivered is 600 mg administered twice per day (1,200 mg per day). In February 2016, the FDA confirmed (through dose concurrence) its earlier dosage guidance of 600 mg administered twice per day (1,200 mg per day). Courses delivered to the Strategic Stockpile are currently subject to the Replacement Obligation (as discussed above).

The Company is eligible under the Base Contract to receive a $41 million hold back payment, which represents an approximate 10% hold back on the $409.8 million of total payments related to the manufacture and delivery of 1.7 million courses of TPOXX® under the Base Contract. The $41 million hold back payment would be triggered by FDA approval of TPOXX®, provided that the Company no longer has the Replacement Obligation to BARDA.

In addition to the Base Contract, the BARDA Contract also includes remaining options that, if all were exercised by BARDA, would result in aggregate payments to the Company of $122.7 million, including: a $50.0 million payment to the Company in the event of FDA approval for extension to 84-month expiry for TPOXX® (from 38-month expiry as required in the Base Contract); up to $58.3 million of funding for development and supportive activities such as work on a smallpox prophylaxis indication for TPOXX®; and/or $14.4 million of funding for production-related activities related to warm-base manufacturing. In 2015, BARDA exercised two options related to extending the indication of the drug to the geriatric and pediatric populations. The stated value of these exercises was minimal. BARDA, in its sole discretion, may choose not to exercise unexercised options. However, BARDA has indicated that it will evaluate, after the FDA’s review and evaluation of stability data, the Company's request that BARDA exercise the option for the $50.0 million payment to the Company in the event of FDA approval of 84-month expiry for TPOXX®.

The BARDA Contract expires in September 2020.

As described in Note 2, cash inflows related to delivery of courses are recorded as deferred revenue due to the constraint on the consideration received. As of March 31, 2018, the Company recorded $375.5 million of deferred revenue in connection with the BARDA contract (of which $368.9 million relates to the manufacture and delivery of 1.7 million courses of TPOXX® and the remainder relates to supportive activities). Deferred revenue under the BARDA Contract is classified as a long-term liability since there can be no assurance that the Replacement Obligation under the BARDA contract will be reasonably satisfied within twelve months. In addition, direct costs incurred by the Company to fulfill the delivery of courses, including the supplementing of courses previously delivered under the BARDA Contract, are being deferred and will be recognized as expenses in the period of the FDA’s approval of the final version of TPOXX® (quantification and specification of the Replacement Obligation) has occurred. As of March 31, 2018 and December 31, 2017, deferred direct costs under the BARDA Contract of approximately $94.3 million and $96.5 million, respectively, are included in deferred costs on the condensed consolidated balance sheets.

Research Agreements and Grants

The Company has an R&D program for the intravenous (IV) formulation of TPOXX®. This program is funded by a development contract with BARDA ("IV Formulation R&D Contract"). This contract has a period of performance that terminates on December 30, 2020.

Contracts and grants include, among other things, options that may or may not be exercised at BARDA’s discretion. Moreover, contracts and grants contain customary terms and conditions including BARDA’s right to terminate or restructure a contract or grant for convenience at any time. As such, we may not be able to utilize all available funds.