Income Taxes	9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes ASC 740, Income Taxes requires that a valuation allowance be established when it is “more likely than not” that all or a portion of deferred tax assets will not be realized. At each reporting date, the Company considers new evidence, both positive and negative, that could impact management’s view with regard to future realization of deferred tax assets. During the quarter ended September 30, 2018, the Company received FDA approval and recorded revenue related to the delivery of its TPOXX® product. The Company also recorded revenue related to the FDA holdback payment and the payment for 84-month expiry. In addition, the Company entered into a new contract with BARDA for the purchase of up to 1.7 million courses of TPOXX®. Based on these factors, the Company determined during the quarter ended September 30, 2018 that sufficient positive evidence exists to conclude that substantially all of its deferred tax assets are realizable on a more-likely-than-not basis. On December 22, 2017, the SEC staff issued Staff Accounting Bulletin (“SAB”) No. 118, which provides guidance on accounting for the tax effects of the 2017 Tax Cuts and Jobs Act (“TCJA”). The purpose of SAB No. 118 was to address any uncertainty or diversity of view in applying ASC Topic 740, Income Taxes in the reporting period in which the TCJA was enacted. SAB No. 118 addresses situations where the accounting is incomplete for certain income tax effects of the TCJA upon issuance of a company’s financial statements for the reporting period that includes the enactment date. SAB No. 118 allows for a provisional amount to be recorded if it is a reasonable estimate of the impact of the TCJA. Additionally, SAB No. 118 allows for a measurement period to finalize the effects of the TCJA, not to extend beyond one year from the date of enactment. The Company's accounting for the TCJA is complete as of September 30, 2018 with no significant differences from our provisional estimates. For the three and nine months ended September 30, 2018, we incurred pre-tax income of $362.6 million and $344.0 million and a corresponding income tax benefit of $25.4 million and $25.4 million, respectively, which includes a discrete benefit of $25.8 million for both periods. For the three and nine month period, the $25.8 million benefit primarily relates to the Company’s assessment that its deferred tax assets are realizable on a more-likely-than-not basis as a result of the award of the 2018 BARDA Contract and current forecasts of future pre-tax earnings.

Income Taxes

ASC 740, Income Taxes requires that a valuation allowance be established when it is “more likely than not” that all or a portion of deferred tax assets will not be realized. At each reporting date, the Company considers new evidence, both positive and negative, that could impact management’s view with regard to future realization of deferred tax assets. During the quarter ended September 30, 2018, the Company received FDA approval and recorded revenue related to the delivery of its TPOXX® product. The Company also recorded revenue related to the FDA holdback payment and the payment for 84-month expiry. In addition, the Company entered into a new contract with BARDA for the purchase of up to 1.7 million courses of TPOXX®. Based on these factors, the Company determined during the quarter ended September 30, 2018 that sufficient positive evidence exists to conclude that substantially all of its deferred tax assets are realizable on a more-likely-than-not basis.

On December 22, 2017, the SEC staff issued Staff Accounting Bulletin (“SAB”) No. 118, which provides guidance on accounting for the tax effects of the 2017 Tax Cuts and Jobs Act (“TCJA”). The purpose of SAB No. 118 was to address any uncertainty or diversity of view in applying ASC Topic 740, Income Taxes in the reporting period in which the TCJA was enacted. SAB No. 118 addresses situations where the accounting is incomplete for certain income tax effects of the TCJA upon issuance of a company’s financial statements for the reporting period that includes the enactment date. SAB No. 118 allows for a provisional amount to be recorded if it is a reasonable estimate of the impact of the TCJA. Additionally, SAB No. 118 allows for a measurement period to finalize the effects of the TCJA, not to extend beyond one year from the date of enactment. The Company's accounting for the TCJA is complete as of September 30, 2018 with no significant differences from our provisional estimates.

For the three and nine months ended September 30, 2018, we incurred pre-tax income of $362.6 million and $344.0 million and a corresponding income tax benefit of $25.4 million and $25.4 million, respectively, which includes a discrete benefit of $25.8 million for both periods. For the three and nine month period, the $25.8 million benefit primarily relates to the Company’s assessment that its deferred tax assets are realizable on a more-likely-than-not basis as a result of the award of the 2018 BARDA Contract and current forecasts of future pre-tax earnings.