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Acquisition of Sangamo France - Summary of Estimated Fair Value of Net Assets Acquired (Detail) - USD ($)
$ in Thousands
Oct. 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill   $ 39,273 $ 40,044 $ 1,585
TxCell S.A.        
Business Acquisition [Line Items]        
Consideration transferred $ 45,911      
Fair value of non-controlling interest 35,829      
Fair value of Sangamo France 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