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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (13,331)	$ (8,395)	$ (28,972)	$ (20,679)
Other comprehensive (loss) income
Foreign currency translation adjustment	(98)		(98)
Unrealized (losses) gains on available-for-sale investments, net of taxes	(94)	(518)	452	(2,004)
Comprehensive loss	(13,523)	(8,913)	(28,618)	(22,683)
Comprehensive loss attributable to noncontrolling interest	(56)	(6)	(78)	(6)
Total comprehensive loss attributable to Cerus Corporation	$ (13,467)	$ (8,907)	$ (28,540)	$ (22,677)

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