Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Tax Disclosure [Line Items]
Income tax expense (benefit)	$ (56)	$ 98	$ 18	$ 175
Cerus Europe B.V.
Income Tax Disclosure [Line Items]
Income tax expense (benefit)		$ 100
Cerus Europe B.V. | Maximum
Income Tax Disclosure [Line Items]
Income tax expense (benefit)	$ (100)		$ 100	$ 200