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Basic and Diluted Net Loss Per Share	6 Months Ended
Basic and Diluted Net Loss Per Share	Jun. 30, 2015
Earnings Per Share [Abstract]
Basic and Diluted Net Loss Per Share	NOTE 4—BASIC AND DILUTED NET LOSS PER SHARE Basic net loss per share has been computed by dividing the 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 and potential dilutive securities outstanding during the period. Because Sangamo is in a net loss position, diluted net loss per share excludes the effects of common stock equivalents consisting of stock options, which are anti-dilutive. The total number of shares subject to stock options outstanding excluded from consideration in the calculation of diluted net loss per share for the three and six months ended June 30, 2015 and 2014 were 7,350,287 and 7,243,724, respectively.