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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, 2019
Dec. 31, 2018
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items]    
Beginning balance $ 2,332  
Changes in the fair value of equity instruments measured at fair value through other comprehensive income 1,670 $ (419)
Ending balance 4,062 2,332
Significant unobservable inputs (Level 3) [Member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items]    
Beginning balance 2,332 2,747
Changes in the fair value of equity instruments measured at fair value through other comprehensive income 1,670 (419)
Exchange difference on translation 60 4
Ending balance $ 4,062 $ 2,332