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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Intangible Assets [Line Items]    
Beginning balance $ 128  
Ending balance 180 $ 128
Gross carrying amount [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance 621 586
Addition 67 20
Transfer 40  
Exchange difference 15 15
Ending balance 743 621
Accumulated depreciation and amortisation [member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance (493) (429)
Amortization (62) (50)
Exchange difference (8) (14)
Ending balance $ (563) $ (493)