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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Intangible Assets [Line Items]    
Beginning balance $ 157  
Ending balance 128 $ 157
Gross carrying amount [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance 586 526
Addition 20 67
Exchange difference 15 (7)
Ending balance 621 586
Accumulated depreciation [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance (429) (388)
Amortization (50) (44)
Exchange difference (14) 3
Ending balance $ (493) $ (429)