U.S. Government Agreement, Joint Venture and Collaborations (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended		75 Months Ended
	Oct. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2015	Sep. 30, 2014	Oct. 31, 2013	Dec. 31, 2011
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Ownership percentage		20.00%		20.00%				20.00%
Government contracts		$ 13,720	$ 7,241	$ 22,966	$ 12,713			$ 101,000
Research and development collaborations		$ 276	$ 1,018	$ 906	$ 3,008
Cadila [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Joint Venture Percentage Owned By Others		80.00%		80.00%				80.00%
HHS BARDA Contract [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Government contracts				$ 3,100
Government Contract Receivable									$ 97,000
Increase in funding for recovery of additional costs under contract		$ 7,700
HHS BARDA Option for Additional Period [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Government Contract Receivable									$ 70,000
License Agreement with LG Life Sciences, Ltd. [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront license payment											$ 2,500
PATH Vaccine Solutions [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Research and development collaborations		$ 100		$ 500				$ 6,800
Research and development collaboration increase										$ 400
Contract	$ 1,000					$ 3,500	$ 2,000