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Acquisition of Txcell S.A. - Summary of Estimated Fair Value of Net Assets Acquired (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 01, 2018
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2018
Jun. 30, 2019
Business Acquisition [Line Items]          
Fair value of non-controlling interest     $ 35,829 $ 35,829  
Goodwill     40,044 40,044 $ 39,795
TxCell S.A.          
Business Acquisition [Line Items]          
Consideration transferred $ 45,911 $ 45,900 $ 33,900 $ 80,400  
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