U.S. Government Agreement, Joint Venture and Collaborations (Details) (USD $)	3 Months Ended		6 Months Ended			1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended	41 Months Ended	1 Months Ended		1 Months Ended	3 Months Ended	6 Months Ended	24 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Cadila [Member]	Feb. 28, 2011 HHS BARDA Contract [Member]	Jun. 30, 2014 HHS BARDA Contract [Member]	Jun. 30, 2014 HHS BARDA Contract [Member]	Dec. 31, 2012 HHS BARDA Contract [Member]	Jun. 30, 2014 HHS BARDA Contract [Member]	Feb. 28, 2011 HHS BARDA Option for Additional Period [Member]	Feb. 28, 2011 License Agreement with LG Life Sciences, Ltd. [Member]	Dec. 31, 2013 PATH Vaccine Solutions [Member]	Jun. 30, 2014 PATH Vaccine Solutions [Member]	Jun. 30, 2014 PATH Vaccine Solutions [Member]	Jun. 30, 2014 PATH Vaccine Solutions [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contract receivable						$ 97,000,000					$ 79,000,000
Contract term						3 years					2 years
Government contracts	7,241,000	3,276,000	12,713,000	6,717,000			7,200,000	12,500,000		65,000,000
Research and development collaborations	1,018,000	255,000	3,008,000	648,000										700,000	1,900,000	5,800,000
Contract													3,500,000			6,000,000
Trial costs incurred									2,900,000
Upfront license payment												$ 2,500,000
Ownership percentage	20.00%		20.00%
Joint Venture Percentage Owned By Others					80.00%