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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (45,939)	$ (42,974)
Foreign currency translation adjustment	(4,749)	(1,633)
Change in unrealized gain on marketable securities, net of tax	44	254
Comprehensive loss	(50,644)	(44,353)
Comprehensive loss attributable to non-controlling interest	(6)	(61)
Comprehensive loss attributable to Sangamo Therapeutics, Inc.	$ (50,638)	$ (44,292)

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