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Acquisition of Sangamo Therapeutics France S.A.S. - Summary of Estimated Fair Value of Net Assets Acquired (Detail) - USD ($)
$ in Thousands
Oct. 01, 2018
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 38,270 $ 40,044
TxCell S.A.      
Business Acquisition [Line Items]      
Consideration transferred $ 45,911    
Fair value of non-controlling interest 35,829    
Fair value of TxCell 81,740    
Cash 4,779    
Current assets 2,427    
Property and equipment 1,857    
IPR&D 55,019    
Other assets 155    
Current liabilities (9,761)    
Assumed debt liabilities (4,933)    
Deferred tax liability, net (6,798)    
Fair value of net identifiable assets acquired 42,745    
Goodwill 38,995    
Total fair value of net assets acquired $ 81,740