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Development and License Agreements - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Licenses Agreements [Line Items]      
Payments made relating to the manufacturing of the products $ 5,400,000 $ 3,200,000  
BARDA Agreement      
Licenses Agreements [Line Items]      
Committed fund receivable 88,200,000    
Committed fund receivable $ 186,200,000    
Period of agreement 5 years    
Accounts receivable of billed and unbilled amounts $ 2,000,000   $ 1,400,000
BARDA Agreement | Cerus Corporation      
Licenses Agreements [Line Items]      
Co-investment by the company 5,000,000    
Additional co-investment by the company $ 9,600,000