Procurement Contract and Research Agreements (Details) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 24, 2011 course	May 31, 2011 course	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 grant	Dec. 31, 2012
Procurement Contract [Line Items]
Deferred costs			$ 2,841,534	$ 250,072		$ 2,841,534
Number of courses to be delivered, minimum delivery threshold					500,000
Number of active contracts						1
Number of active grants						2
Accounts receivable			3,771,219	0		3,771,219
BARDA Contract
Procurement Contract [Line Items]
Number of courses to be delivered		2,000,000
Value of contract		463,000,000
Contract value of development and support activities		54,000,000
Option to purchase additional courses		12,000,000
Number of courses under modified contract	1,700,000
Number of courses manufactured using federal funds	300,000
Proceeds from advance payments under the BARDA contract				41,000,000
Deferred costs			2,800,000	250,000		2,800,000
Deferred revenue, additions from BARDA contract						3,800,000
Milestone payment			12,300,000
Number of courses to be delivered, minimum delivery threshold					500,000
Potential future research and development funding			19,000,000			19,000,000
Accounts receivable			$ 3,800,000			$ 3,800,000