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Acquisition of Ceregene - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Oct. 31, 2013
Dec. 31, 2017
Dec. 31, 2015
Dec. 31, 2016
Mar. 31, 2015
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 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
Estimated fair values of in-process research and development 1,900,000        
Impairment charge     $ 1,900,000    
Goodwill $ 1,600,000        
Goodwill impairment recognized   $ 0