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Right of Use Assets - Summary of Right of Use Assets Recognized in Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of detailed information about Right-of-use assets [Line Items]        
Right of use assets $ 3,248 $ 3,735 $ 3,801 $ 0
Land [Member]        
Disclosure of detailed information about Right-of-use assets [Line Items]        
Right of use assets 2,843 3,029    
Buildings [Member]        
Disclosure of detailed information about Right-of-use assets [Line Items]        
Right of use assets 281 546    
Motor vehicle and other asset [Member]        
Disclosure of detailed information about Right-of-use assets [Line Items]        
Right of use assets 47 58    
Office equipment [Member]        
Disclosure of detailed information about Right-of-use assets [Line Items]        
Right of use assets $ 77 $ 102