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Summary of Significant Accounting Policies - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
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Feb. 28, 2021 | Dec. 31, 2022 USD ($) Segment Customer | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Net cash used in operating activities |  | $ (25,615,000) | $ (33,922,000) | $ (41,811,000)
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. |  |
Application of an optional exemption not to disclose the value of unsatisfied performance obligations |  | true |  |
Number of major customers representing outstanding trade receivables | Customer |  | 2 |  |
Inventory valuation reserves |  | $ 700,000 |  |
Non-cash purchases of capital expenditures |  | $ 700,000 | 100,000 |
Number of reportable segments | Segment |  | 1 |  |
Operating expenses |  | $ 147,442,000 | 144,979,000 | 131,425,000
Dispose, impair or recognition of additional goodwill |  | 0 | 0 | 0
Impairment on investments |  |  | 0 |
Impairments for long-lived assets |  | $ 0 | 0 | 300,000
Period of warranty |  | 1 year |  |
Warranty claim liability |  | $ 0 | 0 |
Cerus Zhongbaokang Shandong Biomedical Co L T D |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Operating expenses |  | $ 200,000 |  |
China | Cerus Zhongbaokang Shandong Biomedical Co L T D |  |  |  |
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% |  |  |
Noncontrolling interest in variable interest entity |  |  | $ 1,000,000.0 |
Trade Accounts Receivable | Customer Concentration Risk | Customers |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk, percentage |  | 49.00% | 48.00% |
Other Assets |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cash surrender value of associated life insurance policies |  | $ 1,900,000 | $ 1,100,000 |
Other Non-current Liabilities |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Liability for deferred compensation |  | $ 1,900,000 | 1,200,000 |
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 |  |
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 |  |
Inventory valuation reserves |  |  | 200,000 |
Estimated useful life of property and equipment |  | 5 years |  |
Product |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Contract asset |  | $ 100,000 | $ 0 |
Preferred Stock and Warrants |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Impairment on investments |  | $ 2,200,000 |  |
Immaterial Correction of an Error |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Net cash used in operating activities |  |  |  | $ 1,100,000

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