Subsequent events	9 Months Ended
Sep. 30, 2017
Subsequent events [Abstract]
Subsequent events	12. Subsequent events Acquisition of raxibacumab On October 2, 2017, the Company completed the acquisition of raxibacumab, a fully human monoclonal antibody product approved by the U.S. Food and Drug Administration ("FDA") for the treatment and prophylaxis of inhalational anthrax, from Human Genome Sciences, Inc. and GlaxoSmithKline LLC (collectively referred to as "GSK"). The all-cash transaction consists of a $76 million upfront payment and up to $20 million in product sale and manufacturing-related milestone payments. With the acquisition, the Company assumed responsibility for a multi-year contract with BARDA, with a remaining value of up to approximately $130 million, to supply the product to the SNS through November 2019. The Company has determined that substantially all of the value of raxibacumab is attributed to the raxibacumab asset and therefore the raxibacumab acquisition is considered an asset acquisition. Acquisition of ACAM2000 On October 6, 2017, the Company completed the acquisition of the ACAM2000® (Smallpox (Vaccinia) Vaccine, Live) business of Sanofi Pasteur Biologics, LLC ("Sanofi"). This acquisition includes ACAM2000, the only smallpox vaccine approved by the FDA, a current good manufacturing practices ("cGMP") live viral manufacturing facility and office and warehouse space, both in Canton, Massachusetts, and a cGMP viral fill/finish facility in Rockville, Maryland. With this acquisition, the Company also assumed responsibility for an existing 10-year contract with the Centers for Disease Control and Prevention ("CDC"), which will expire and be up for renewal or extension in March 2018. This contract was originally valued at up to $425 million, with a remaining value of up to approximately $160 million, for the delivery of ACAM2000 to the SNS and establishing U.S.-based manufacturing of ACAM2000. At the closing, the Company paid $97.5 million in an upfront payment and $20 million in milestone payments earned as of the closing date tied to the achievement of certain regulatory and manufacturing-related milestones, for a total payment in cash of $117.5 million. The agreement includes a potential additional milestone payment of up to $7.5 million. This transaction will be accounted for by the Company under the acquisition method of accounting, with the Company as the acquirer. Under the acquisition method of accounting, the assets and liabilities of the ACAM2000 business will be recorded as of October 6, 2017, the acquisition date, at their respective fair values, and combined with those of the Company. As of the date of this filing, the valuation of acquired intangible assets, inventory, deferred taxes, property plant and equipment, contingent purchase consideration and other fair value adjustments are not complete, and as such the purchase price allocation is subject to change.

12. Subsequent events

Acquisition of raxibacumab

On October 2, 2017, the Company completed the acquisition of raxibacumab, a fully human monoclonal antibody product approved by the U.S. Food and Drug Administration ("FDA") for the treatment and prophylaxis of inhalational anthrax, from Human Genome Sciences, Inc. and GlaxoSmithKline LLC (collectively referred to as "GSK"). The all-cash transaction consists of a $76 million upfront payment and up to $20 million in product sale and manufacturing-related milestone payments. With the acquisition, the Company assumed responsibility for a multi-year contract with BARDA, with a remaining value of up to approximately $130 million, to supply the product to the SNS through November 2019. The Company has determined that substantially all of the value of raxibacumab is attributed to the raxibacumab asset and therefore the raxibacumab acquisition is considered an asset acquisition.

Acquisition of ACAM2000

On October 6, 2017, the Company completed the acquisition of the ACAM2000® (Smallpox (Vaccinia) Vaccine, Live) business of Sanofi Pasteur Biologics, LLC ("Sanofi"). This acquisition includes ACAM2000, the only smallpox vaccine approved by the FDA, a current good manufacturing practices ("cGMP") live viral manufacturing facility and office and warehouse space, both in Canton, Massachusetts, and a cGMP viral fill/finish facility in Rockville, Maryland. With this acquisition, the Company also assumed responsibility for an existing 10-year contract with the Centers for Disease Control and Prevention ("CDC"), which will expire and be up for renewal or extension in March 2018. This contract was originally valued at up to $425 million, with a remaining value of up to approximately $160 million, for the delivery of ACAM2000 to the SNS and establishing U.S.-based manufacturing of ACAM2000.

At the closing, the Company paid $97.5 million in an upfront payment and $20 million in milestone payments earned as of the closing date tied to the achievement of certain regulatory and manufacturing-related milestones, for a total payment in cash of $117.5 million. The agreement includes a potential additional milestone payment of up to $7.5 million. This transaction will be accounted for by the Company under the acquisition method of accounting, with the Company as the acquirer. Under the acquisition method of accounting, the assets and liabilities of the ACAM2000 business will be recorded as of October 6, 2017, the acquisition date, at their respective fair values, and combined with those of the Company.

As of the date of this filing, the valuation of acquired intangible assets, inventory, deferred taxes, property plant and equipment, contingent purchase consideration and other fair value adjustments are not complete, and as such the purchase price allocation is subject to change.