Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Tax Disclosure [Line Items]
Income tax expense (benefit)	$ 76	$ (56)	$ 150	$ 18
Cerus Europe B.V.
Income Tax Disclosure [Line Items]
Income tax expense (benefit)	$ 100		$ 100
Cerus Europe B.V. | Maximum
Income Tax Disclosure [Line Items]
Income tax expense (benefit)		$ (100)		$ 100