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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items]      
Beginning balance $ 2,271    
Changes in the fair value of equity instruments measured at fair value through other comprehensive income 734 $ (1,789) $ 1,670
Ending balance 2,929 2,271  
Significant unobservable inputs (Level 3) [Member]      
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items]      
Beginning balance 2,271 4,062  
Changes in the fair value of equity instruments measured at fair value through other comprehensive income 734 (1,789)  
Exchange difference on translation (76) (2)  
Ending balance $ 2,929 $ 2,271 $ 4,062