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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (7,286)	$ (8,521)	$ (36,258)	$ (29,200)
Other comprehensive (loss) income
Foreign currency translation adjustment	(3)		(101)
Unrealized gains (losses) on available-for-sale investments, net of taxes	211	(1,036)	663	(3,040)
Comprehensive loss	(7,078)	(9,557)	(35,696)	(32,240)
Comprehensive loss attributable to noncontrolling interest	(19)	(39)	(97)	(45)
Total comprehensive loss attributable to Cerus Corporation	$ (7,059)	$ (9,518)	$ (35,599)	$ (32,195)

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