CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net loss	$ (5,775)	$ (13,331)	$ (15,465)	$ (28,972)
Other comprehensive (loss) income
Foreign currency translation adjustment	(3)	(98)	(11)	(98)
Unrealized gains (losses) on available-for-sale investments, net of taxes	258	(94)	418	452
Comprehensive loss	(5,520)	(13,523)	(15,058)	(28,618)
Comprehensive loss attributable to noncontrolling interest		(56)	(2)	(78)
Total comprehensive loss attributable to Cerus Corporation	$ (5,520)	$ (13,467)	$ (15,056)	$ (28,540)