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Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 25,800 | $ 57,763 | $ 21,553 | $ 13,076 | $ 54,851 | $ 21,958 | $ 17,548 | $ 8,071 | $ 118,192 | $ 102,428 | $ 84,452
Operating expenses | 69,232 | 61,464 | 59,450 | 57,598 | 53,382 | 51,206 | 51,052 | 51,968 | 247,744 | 207,608 | 161,602
Net loss | (40,675) | (1,508) | (35,965) | (42,974) | 4,501 | (27,361) | (30,356) | (42,203) | (121,122) | (95,419) | (68,889)
Net loss attributable to non-controlling interest | (71) | 42 | (36) | (61) | (54) | (54) | (72) | (53) | (126) | (233) | (555)
Net (loss) income attributable to Sangamo Therapeutics, Inc. | $ (40,604) | $ (1,550) | $ (35,929) | $ (42,913) | $ 4,555 | $ (27,307) | $ (30,284) | $ (42,150) | $ (120,996) | $ (95,186) | $ (68,334)
Net loss per share - basic and diluted (in dollars per share) | $ (0.29) | $ (0.01) | $ (0.26) | $ (0.37) | $ 0.04 | $ (0.24) | $ (0.26) | $ (0.41) | $ (0.90) | $ (0.85) | $ (0.70)

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