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Summary of Significant Accounting Policies - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Feb. 28, 2021 | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) Customer | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Segment | Sep. 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 |  | 34,443,000 |  | $ 31,799,000 | $ 111,416,000 | $ 100,022,000 |
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 |  |  |  |  | 51.00% |  | 37.00%
Other Assets |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash surrender value of associated life insurance policies |  | 3,100,000 | 2,800,000 |  | $ 3,100,000 |  | $ 2,800,000
Other Non-current Liabilities |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Liability for deferred compensation |  | $ 3,700,000 | $ 3,100,000 |  | $ 3,700,000 |  | $ 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 |  | $ 1,300,000 | $ 500,000 |  | $ 1,300,000 |  | $ 500,000

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