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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Intangible Assets [Line Items]    
Beginning balance $ 138  
Ending balance 157 $ 138
Gross carrying amount [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance 526 510
Addition 67 10
Disposals   (18)
Exchange difference (7) 24
Ending balance 586 526
Accumulated depreciation [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance (388) (337)
Amortization (44) (49)
Disposals   18
Exchange difference 3 (20)
Ending balance $ (429) $ (388)