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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net loss	$ (43,977)	$ (45,939)
Foreign currency translation adjustment	(1,904)	(4,749)
Net pension gains	19	0
Unrealized (loss) gain on marketable securities, net of tax	(1,083)	44
Comprehensive loss	(46,945)	(50,644)
Comprehensive loss attributable to non-controlling interest	0	(6)
Comprehensive loss attributable to Sangamo Therapeutics, Inc.	$ (46,945)	$ (50,638)

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