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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (47,174)	$ (35,965)	$ (93,113)	$ (78,939)
Foreign currency translation adjustment	1,308	1,783	(3,441)	150
Unrealized gain (loss) on marketable securities, net of tax	(35)	392	9	646
Comprehensive loss	(45,901)	(33,790)	(96,545)	(78,143)
Comprehensive loss attributable to non-controlling interest	(5)	(36)	(11)	(97)
Comprehensive loss attributable to Sangamo Therapeutics, Inc.	$ (45,896)	$ (33,754)	$ (96,534)	$ (78,046)

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