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Procurement Contract and Research Agreements (Details)
contract in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
May 13, 2011
USD ($)
course
contract
May 31, 2011
course
Jun. 30, 2018
USD ($)
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 72,700,000              
Contract Value, Detail Of Option Exercisable, Development Activities 58,300,000              
Contract Value, Detail Of Option Exercisable, Production Activities $ 14,400,000              
Deferred costs     $ 0         $ 96,592,334
BARDA Contract                
Procurement Contract [Line Items]                
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          
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      
Deferred revenue     $ 375,500,000          
Deferred costs     $ 94,400,000         $ 96,500,000