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Financial Assets and Financial Liabilities - Reconciliation of the Beginning and Closing Balances of Equity Instrument as Financial Assets at FVCOI Classified as Level 3 Within the Fair Value Hierarchy (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items]      
Beginning balance $ 2,747    
Changes in the fair value of equity instruments measured at fair value through other comprehensive income (419)    
Net gain/(loss) on available-for-sale financial assets   $ (80) $ (102)
Ending balance 2,332    
Ending balance   2,747  
Significant unobservable inputs (Level 3) [Member]      
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items]      
Beginning balance 2,747 2,765  
Net gain/(loss) on available-for-sale financial assets   (80)  
Exchange difference on translation   62  
Ending balance   2,747 $ 2,765
Effect Of Adoption Of New Standards [Member] | Significant unobservable inputs (Level 3) [Member]      
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items]      
Beginning balance 2,747    
Changes in the fair value of equity instruments measured at fair value through other comprehensive income (419)    
Exchange difference on translation 4    
Ending balance $ 2,332 $ 2,747