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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