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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Intangible Assets [Line Items]    
Beginning balance $ 173  
Ending balance 138 $ 173
Gross carrying amount [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance 510 387
Addition 10 126
Disposals (18)  
Exchange difference 24 (3)
Ending balance 526 510
Accumulated depreciation [Member]    
Disclosure Of Intangible Assets [Line Items]    
Beginning balance (337) (294)
Amortization (49) (46)
Disposals 18  
Exchange difference (20) 3
Ending balance $ (388) $ (337)