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Procurement Contract and Research Agreements (Details)
contract in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
May 13, 2011
USD ($)
course
contract
May 31, 2011
course
Mar. 31, 2018
USD ($)
course
Dec. 31, 2016
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2017
USD ($)
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   $ 368,900,000          
Number of courses under modified contract | contract 1.7              
Contract value of development and support activities $ 62,500,000              
Proceeds from manufacture and physical delivery of courses, government contract     368,900,000          
Proceeds from advance payments under the BARDA contract             $ 41,000,000  
Milestone payment       $ 20,500,000        
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 revenue     1,255,318         $ 1,255,318
Deferred costs     $ 94,296,804         96,592,334
BARDA Contract                
Procurement Contract [Line Items]                
Government contract, number of free courses | course 300,000              
Reduced holdback amount $ 41,000,000              
Proceeds from advance payments under the BARDA contract             $ 41,000,000  
Milestone payment         $ 8,200,000 $ 12,300,000    
Proceeds From Physical Delivery Of Courses, Government Contracts         $ 286,900,000      
Government contract, total number of courses required to be delivered | course   2,000,000 2,000,000          
Deferred revenue     $ 375,500,000          
Deferred costs     $ 94,300,000         $ 96,500,000