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Summary of Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2021
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Customer
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Segment
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Customer
Summary Of Significant Accounting Policies [Line Items]              
Description of payment of customer invoice contract         The Company invoices its customers based upon the terms in the contracts, which generally require payment 30 to 60 days from the date of invoice.    
Number of major customers representing outstanding accounts receivable | Customer     1       1
Shelf life period, platelet kits     18 months        
Inventory valuation reserves   $ 600,000 $ 900,000   $ 600,000   $ 900,000
Number of reportable segments | Segment         1    
Operating expenses   40,082,000   $ 33,942,000 $ 76,973,000 $ 68,223,000  
Period of warranty         1 year    
Warranty claim liability   0 0   $ 0   $ 0
Cerus Zhongbaokang Shandong Biomedical Co LTD | China              
Summary Of Significant Accounting Policies [Line Items]              
Variable interest entity, Purpose of VIE         the Company entered into an Equity Joint Venture Contract with Shandong Zhongbaokang Medical Implements Co., Ltd. (“ZBK”), to establish Cerus Zhongbaokang (Shandong) Biomedical Co., LTD. (the “JV”) for the purpose of developing, obtaining regulatory approval for, and eventual manufacturing and commercialization of the INTERCEPT blood transfusion for platelets and red blood cells in the People’s Republic of China.    
Ownership percentage 51.00%            
Trade Accounts Receivable | Customer Concentration Risk | Customers              
Summary Of Significant Accounting Policies [Line Items]              
Concentration risk, percentage         53.00%   37.00%
Other Assets              
Summary Of Significant Accounting Policies [Line Items]              
Cash surrender value of associated life insurance policies   3,000,000 2,800,000   $ 3,000,000   $ 2,800,000
Other Non-current Liabilities              
Summary Of Significant Accounting Policies [Line Items]              
Liability for deferred compensation   $ 3,500,000 $ 3,100,000   $ 3,500,000   $ 3,100,000
Minimum              
Summary Of Significant Accounting Policies [Line Items]              
Payment of customer invoice contract period         30 days    
Estimated useful life of property and equipment     3 years       3 years
Maximum              
Summary Of Significant Accounting Policies [Line Items]              
Payment of customer invoice contract period         60 days    
Percentage of deferred compensation from base salary         80.00%    
Percentage of deferred compensation from variable compensation         100.00%    
Shelf lives of inventory         24 months    
Estimated useful life of property and equipment   5 years     5 years    
Product              
Summary Of Significant Accounting Policies [Line Items]              
Contract asset   $ 0 $ 0   $ 0   $ 0
Contract liabilities   $ 400,000 $ 500,000   $ 400,000   $ 500,000