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Acquisition of Ceregene - Additional Information (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2013 USD ($) shares | Dec. 31, 2015 USD ($) Candidate | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Business Acquisition [Line Items] |  |  |  |
Impairment charge |  | $ 1,870 |  |
Change in fair value of contingent liability |  | $ 1,800 | $ (230) | $ (60)
Ceregene, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Common stock, transferred, shares | shares | 100,000 |  |  |
Sangamo shares of common stock | $ 1,200 |  |  |
Contingent earn-out | 1,500 |  |  |
Purchase price deposited in escrow account | 300 |  |  |
Number of clinical product candidates | Candidate |  | 2 |  |
Estimated fair values of in-process research and development | 1,900 |  |  |
Impairment charge |  | $ 1,870 |  |
Goodwill | 1,585 |  |  |
Fair value liability for contingent consideration recognized | $ 1,500 |  |  |
Change in fair value of contingent liability |  | $ 1,800 |  |

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