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Basic and Diluted Net Loss Per Share | 9 Months Ended
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Sep. 30, 2013
Earnings Per Share [Abstract] |
Basic and Diluted Net Loss Per Share | NOTE 3—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 options, which are anti-dilutive. The total stock options outstanding excluded from consideration in the calculation of diluted net loss per share for the nine months ended September 30, 2013 and 2012 were 7,853,936 and 8,075,898, respectively.

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