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Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenues	$ 21,958	$ 23,562	$ 47,577	$ 57,615
Operating expenses:
Research and development	36,288	28,810	107,593	81,612
General and administrative	14,918	10,993	46,633	32,381
Total operating expenses	51,206	39,803	154,226	113,993
Loss from operations	(29,248)	(16,241)	(106,649)	(56,378)
Interest and other income, net	1,887	3,398	6,729	6,708
Net loss	(27,361)	(12,843)	(99,920)	(49,670)
Net loss attributable to non-controlling interest	(54)	0	(179)	0
Net loss to Sangamo Therapeutics, Inc. stockholders	$ (27,307)	$ (12,843)	$ (99,741)	$ (49,670)
Basic and diluted net loss per share attributable to Sangamo Therapeutics, Inc. stockholders (in USD per share)	$ (0.24)	$ (0.13)	$ (0.90)	$ (0.52)
Shares used in computing basic and diluted net loss per share attributable to Sangamo Therapeutics, Inc. stockholders (in shares)	115,710	101,725	110,837	95,165

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