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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (121,122)	$ (95,419)	$ (68,889)
Foreign currency translation adjustment	8,345	(1,573)	(1,148)
Net pension losses	(193)	(28)	(21)
Change in unrealized (loss) gain on marketable securities, net of tax	(284)	592	(4)
Comprehensive loss	(113,254)	(96,428)	(70,062)
Comprehensive loss attributable to non-controlling interest	(126)	(233)	(574)
Comprehensive loss attributable to Sangamo Therapeutics, Inc.	$ (113,128)	$ (96,195)	$ (69,488)

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