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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (1,508)	$ (27,361)	$ (80,447)	$ (99,920)
Foreign currency translation adjustment	3,839	(4,077)	3,989	(4,139)
Change in unrealized (loss) gain on available-for-sale securities	(633)	(59)	13	678
Comprehensive income (loss)	1,698	(31,497)	(76,445)	(103,381)
Comprehensive income (loss) attributable to non-controlling interest	42	(54)	(55)	(179)
Comprehensive income (loss) attributable to Sangamo Therapeutics, Inc.	$ 1,656	$ (31,443)	$ (76,390)	$ (103,202)

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