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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (192,278)	$ (178,297)	$ (121,122)
Foreign currency translation adjustment	(4,606)	(8,351)	8,345
Net pension gain (loss)	786	(716)	(193)
Change in unrealized loss on marketable securities, net of tax	(597)	(339)	(284)
Comprehensive loss	(196,695)	(187,703)	(113,254)
Comprehensive loss attributable to non-controlling interest	0	(11)	(126)
Comprehensive loss attributable to Sangamo Therapeutics, Inc.	$ (196,695)	$ (187,692)	$ (113,128)

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