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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Income Tax Disclosure [Line Items] |  |  |  |
Income tax expense | $ 85 | $ 76 | $ 235 | $ 94
Cerus Europe B.V. |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Income tax expense | $ 100 | $ 100 | $ 200 | $ 100

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