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Development and License Agreements - Additional Information (Detail)
€ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Jun. 30, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Licenses Agreements [Line Items]                  
Payments made relating to the manufacturing of the products   $ 3,200,000 $ 3,500,000            
BARDA Agreement                  
Licenses Agreements [Line Items]                  
Committed fund receivable $ 88,200,000   88,200,000            
Committed fund receivable 186,200,000   $ 186,200,000            
Period of agreement       5 years 5 years        
Accounts receivable of billed and unbilled amounts   1,400,000   $ 1,400,000       $ 1,000,000  
Other current assets                  
Licenses Agreements [Line Items]                  
Research and development assets   200,000   200,000       900,000  
Amounts due from Fresenius   500,000   500,000       300,000  
Other assets                  
Licenses Agreements [Line Items]                  
Research and development assets   2,300,000   2,300,000       2,000,000  
Manufacturing efficiency assets   2,000,000   2,000,000       2,100,000  
Fresenius                  
Licenses Agreements [Line Items]                  
Allocated amount for research and development activities   4,800,000   4,800,000          
Manufacturing efficiency activity cost   2,400,000   2,400,000          
Cerus Corporation | BARDA Agreement                  
Licenses Agreements [Line Items]                  
Co-investment by the company 5,000,000                
Additional co-investment by the company $ 9,600,000                
Manufacturing and Supply Agreement                  
Licenses Agreements [Line Items]                  
Accrual for manufacturing of entity products   2,800,000   2,800,000       3,000,000  
Manufacturing and Supply Agreement | Fresenius                  
Licenses Agreements [Line Items]                  
Payments made based on the successful achievement of production volumes | €           € 8.6      
Accrual for manufacturing and development of entity products   $ 5,400,000   $ 5,400,000     € 4.7 $ 4,800,000 € 4.5
Manufacturing and development obligations, discount rate       9.72% 9.72%        
Manufacturing and development payments       $ 3,400,000 € 3.1