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Fair Value Measurement - Additional Information (Detail) - USD ($)
$ in Thousands
 2 Months Ended 12 Months Ended
Oct. 01, 2018
Nov. 23, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 20, 2018
Debt Securities, Available-for-sale [Line Items]            
Payments to acquire additional interest in subsidiaries     $ 704 $ 262 $ 0  
Business acquisition, number of free shares outstanding subject to purchase (in shares)     44,000      
TxCell S.A.            
Debt Securities, Available-for-sale [Line Items]            
Number of ordinary shares acquired (in shares) 13,519,036 11,528,635        
TxCell S.A. | Share Purchase Agreement and Tender Offer Agreement            
Debt Securities, Available-for-sale [Line Items]            
Number of free shares held by the holders (in shares)           477,000
Business acquisition estimated fair value liabilities of free shares           $ 200
Number of ordinary shares acquired (in shares)     322,000 111,000 25,047,671  
Payments to acquire additional interest in subsidiaries     $ 700 $ 300    
Increase in fair value of free shares asset and liability     100      
Business acquisition estimated fair value assets of free shares     $ 100      
TxCell S.A. | Share Purchase Agreement and Tender Offer Agreement | Option Pricing Method            
Debt Securities, Available-for-sale [Line Items]            
Business acquisition estimated fair value liabilities of free shares $ 200