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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Statement of Comprehensive Income [Abstract]    
Net loss $ (42,974) $ (42,203)
Foreign currency translation adjustment (1,633) (1,504)
Change in unrealized gain on available-for-sale securities 254 253
Comprehensive loss (44,353) (43,454)
Comprehensive loss attributable to non-controlling interest (61) (53)
Comprehensive loss attributable to Sangamo Therapeutics, Inc. $ (44,292) $ (43,401)