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Acquisition of Sangamo Therapeutics France S.A.S. - Summary of Non-controlling Interest (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Noncontrolling Interest [Roll Forward]        
Non-controlling interest, beginning balance     $ 739  
Fair value of additional shares acquired $ (321)   (321)  
Loss attributable to non-controlling interest (54) $ 0 (179) $ 0
Non-controlling interest, ending balance $ 239   $ 239