At The Market Offering	3 Months Ended
Mar. 31, 2017
At The Market Offering [Abstract]
At The Market Offering	NOTE 9—AT THE MARKET OFFERING On December 7, 2016, the Company entered into an “at the market” offering agreement with an investment bank, pursuant to which the Company may issue and sell from time to time up to $75.0 million of Sangamo common stock through the bank as the sales agent (“ATM Agreement”). Under the ATM Agreement, if the Company decides to sell shares, we will notify the sales agent, and the sales agent will use its commercially reasonable efforts to sell on our behalf all of the shares of common stock requested to be sold. Sales of our common stock, if any, will be made at market prices by any method that is deemed to be an “at the market offering” as defined in Rule 415 under the Securities Act, as amended, including sales made directly on The NASDAQ Global Market and sales to or through a market maker other than on an exchange. In addition, with the Company’s prior written consent, the sales agent may also sell our common stock in negotiated transactions. For the three months ended March 31, 2017, Sangamo issued at total of 871,149 shares of common stock under the ATM agreement and received net proceeds of $3.4 million, after deducting offering expenses, including $0.1 million of commission paid to the sales agent.

NOTE 9—AT THE MARKET OFFERING

On December 7, 2016, the Company entered into an “at the market” offering agreement with an investment bank, pursuant to which the Company may issue and sell from time to time up to $75.0 million of Sangamo common stock through the bank as the sales agent (“ATM Agreement”). Under the ATM Agreement, if the Company decides to sell shares, we will notify the sales agent, and the sales agent will use its commercially reasonable efforts to sell on our behalf all of the shares of common stock requested to be sold. Sales of our common stock, if any, will be made at market prices by any method that is deemed to be an “at the market offering” as defined in Rule 415 under the Securities Act, as amended, including sales made directly on The NASDAQ Global Market and sales to or through a market maker other than on an exchange. In addition, with the Company’s prior written consent, the sales agent may also sell our common stock in negotiated transactions. For the three months ended March 31, 2017, Sangamo issued at total of 871,149 shares of common stock under the ATM agreement and received net proceeds of $3.4 million, after deducting offering expenses, including $0.1 million of commission paid to the sales agent.