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Development and License Agreements - Additional Information (Detail)
€ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Licenses Agreements [Line Items]              
Payments made relating to the manufacturing of the products $ 18,100,000   $ 16,100,000   $ 14,900,000    
BARDA Agreement              
Licenses Agreements [Line Items]              
Committed fund receivable 88,200,000            
Committed fund receivable $ 186,200,000            
Period of agreement 5 years 5 years          
Accounts receivable of billed and unbilled amounts $ 1,400,000   1,000,000        
Other current assets              
Licenses Agreements [Line Items]              
Amounts due from Fresenius 200,000   300,000        
Fresenius              
Licenses Agreements [Line Items]              
Allocated amount for research and development activities 4,800,000            
Manufacturing efficiency activity cost 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 4,700,000   $ 3,000,000        
Manufacturing and Supply Agreement | Fresenius              
Licenses Agreements [Line Items]              
Payments made based on the successful achievement of production volumes | €   € 8.6          
Manufacturing and development obligations, discount rate     9.72% 9.72%      
Manufacturing and development payments | €       € 3.1      
Remaining amount payable for manufacturing and development | €   € 5.5          
Accrual for manufacturing and development of entity products $ 5,800,000   $ 4,800,000     € 4.8 € 4.5