U.S. Government Agreement, Joint Venture and Collaborations (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended	12 Months Ended	44 Months Ended					1 Months Ended	3 Months Ended	9 Months Ended	27 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Cadila [Member]	Sep. 30, 2014 HHS BARDA Contract [Member]	Sep. 30, 2014 HHS BARDA Contract [Member]	Dec. 31, 2012 HHS BARDA Contract [Member]	Sep. 30, 2014 HHS BARDA Contract [Member]	Feb. 28, 2011 HHS BARDA Contract [Member]	Sep. 30, 2014 HHS BARDA Option for Additional Period [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]	Sep. 30, 2014 PATH Vaccine Solutions [Member]	Sep. 30, 2014 PATH Vaccine Solutions [Member]	Sep. 30, 2014 PATH Vaccine Solutions [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contract receivable										$ 97,000,000	$ 70,000,000	$ 79,000,000
Government contracts	7,504,000	4,268,000	20,217,000	10,985,000		7,500,000	20,000,000		72,000,000
Research and development collaborations	710,000	534,000	3,718,000	1,182,000											100,000	2,000,000	5,800,000
Contract														3,500,000			5,800,000
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%