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Procurement Contract and Research Agreements (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 24, 2011
course
May 13, 2011
USD ($)
course
May 31, 2011
course
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
course
Dec. 31, 2016
USD ($)
course
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Procurement Contract [Line Items]                  
Reduced holdback amount           $ 40,900,000      
Contract value of various options   $ 122,700,000              
Amount of option to be received from BARDA for approval for extension of 84 moth expiry   50,000,000              
Contract value, detail of option exercisable, development activities   58,300,000              
Contract value, detail of option exercisable, production activities   14,400,000              
Contract value, option, FDA approval   50,000,000              
Deferred costs       $ 96,592,334 $ 96,592,334 72,649,277      
Deferred Revenue       1,255,318 1,255,318 $ 0      
Research and development revenue long-term contract         9,000,000        
Research and development, future aggregate amount       12,900,000 12,900,000        
BARDA Contract                  
Procurement Contract [Line Items]                  
Number of courses to be delivered | course     2,000,000            
Value of contract   472,300,000              
Contract value of manufacturing and delivery activities   $ 409,800,000     $ 40,900,000        
Number of courses under modified contract | course 1,700,000 1,700,000              
Contract value of development and support activities   $ 62,500,000              
Government contract, number of free courses | course   300,000              
Government contract, total number of courses required to be delivered | course         2,000,000 2,000,000      
Proceeds from manufacture and physical delivery of course, government contractses       368,900,000 $ 368,900,000        
Proceeds from advance payments under the BARDA contract                 $ 41,000,000
Milestone payment       20,500,000     $ 8,200,000 $ 12,300,000  
Proceeds from physical delivery of courses, government contracts             $ 286,900,000    
Deferred costs       96,500,000 96,500,000 $ 72,200,000      
Deferred Revenue       $ 377,600,000 $ 377,600,000