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Development and License Agreements - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Licenses Agreements [Line Items]          
Payments made relating to the manufacturing of the products $ 4,800,000 $ 3,200,000 $ 10,200,000 $ 6,400,000  
BARDA Agreement          
Licenses Agreements [Line Items]          
Committed fund receivable 103,200,000   103,200,000    
Committed fund receivable 201,200,000   $ 201,200,000    
Period of agreement     5 years    
Accounts receivable of billed and unbilled amounts $ 3,800,000   $ 3,800,000   $ 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