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Segment information
12 Months Ended
Dec. 31, 2017
Segment information [Abstract]  
Segment information
18. Segment information

On August 6, 2015, the Company announced its plan to separate into two independent publicly-traded companies. In anticipation of the spin-off, the Company realigned certain components of its biosciences business to the new Aptevo segment to be consistent with how the chief operating decision maker ("CODM"), allocates resources and makes decisions about the operations of the Company. Effective January 1, 2016, the Company changed its segment presentation to reflect this new structure, and recast all prior periods presented to conform to the new presentation. On August 1, 2016, the Company completed the spin-off of Aptevo. The results of operations and financial position of Aptevo are reflected as discontinued operations for all periods presented through the date of the spin-off.

For financial reporting purposes, in the periods following the spin-off of Aptevo, the Company reports financial information for one reportable segment. This reportable segment engages in business activities for which discrete financial information is provided to and resources are allocated by the CODM. The accounting policies of the reportable segment is the same as those described in the summary of significant accounting policies.

For the years ended December 31, 2017, 2016, and 2015, the Company's revenues within the United States comprised 89%, 94% and 96%, respectively, of total revenues. For the years ended December 31, 2017, 2016, and 2015, product revenues from BioThrax to the U.S. government comprised approximately 67%, 80% and 89%, respectively, of total product revenues. As of December 31, 2017, 2016, and 2015, there were no other product sales to an individual customer or for an individual product in excess of 10% of total product sales revenues.

For years ended December 31, 2017 and 2016, the Company had long-lived assets outside of the United States of approximately $28.6 million and $28.4 million, respectively, which are primarily located within Canada.