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Stockholders' Equity
 9 Months Ended
Sep. 30, 2013
Equity [Abstract]  
Stockholders' Equity

NOTE 7—STOCKHOLDERS’ EQUITY

On September 23, 2013, Sangamo completed an underwritten public offering of its common stock, in which the Company sold an aggregate of 7,015,000 shares of its common stock, including 915,000 issued to the Underwriters pursuant to a 30-day overallotment option, at a public offering price of $10.58 per share. The net proceeds to Sangamo from the sale of shares in this offering, after deducting underwriting discounts and commissions and other estimated offering expenses, were approximately $69.5 million.