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BASIC AND DILUTED NET LOSS PER SHARE	9 Months Ended
BASIC AND DILUTED NET LOSS PER SHARE	Sep. 30, 2023
Earnings Per Share [Abstract]
BASIC AND DILUTED NET LOSS PER SHARE	BASIC AND DILUTED NET LOSS PER SHARE Basic net loss per share has been computed by dividing net loss by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share is calculated by dividing net loss by the weighted-average number of shares of common stock outstanding during the period, without consideration of any potential dilutive securities, as their effect would be anti-dilutive. The total number of shares subject to stock options and restricted stock units (“RSUs”) outstanding and the employee stock purchase plan (“ESPP”) shares reserved for issuance, which are all anti-dilutive, were excluded from consideration in the calculation of diluted net loss per share attributable to Sangamo Therapeutics, Inc. stockholders. Stock options and RSUs outstanding and ESPP shares reserved for issuance as of September 30, 2023 and 2022 totaled 22,131,291 and 18,524,016, respectively.