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Acquisition of Ceregene - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2013 USD ($) shares | Dec. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) Candidate | Mar. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |
Impairment charge |  | $ 1,870,000 |  |
Goodwill |  | 1,585,000 | $ 1,585,000 |
Ceregene, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Common stock, transferred, shares | shares | 100,000 |  |  |
Sangamo shares of common stock | $ 1,200,000 |  |  |
Contingent earn-out | 1,500,000 |  |  |
Fair value of contingent earn-out liability | 1,800,000 |  |  | $ 0
Number of clinical product candidates | Candidate |  |  | 2 |
Estimated fair values of in-process research and development | 1,900,000 |  |  |
Impairment charge |  | $ 1,900,000 |  |
Goodwill | $ 1,600,000 |  |  |

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