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Income Tax - Major Components of Income Tax (Benefits) Expenses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current income tax:      
Current income tax charge $ 3,078 $ 3,376 $ 1,699
Previously unrecognized tax loss used to reduce current income tax (96) (89)  
Adjustments for current income tax of prior years   (1) (16)
Total current income tax 2,982 3,286 1,683
Deferred tax (benefits)/expenses:      
Relating to origination and reversal of temporary differences (4,327) 782 374
Previously unrecognized tax loss used to reduce deferred tax expenses   (52)  
Total deferred tax (benefits)/expenses (4,327) 730 374
Income tax (benefit) expense reported in the income statement (1,345) 4,016 2,057
Deferred tax related to items recognized in other comprehensive income during the year:      
Change in fair value of equity instrument, Recognized during the year 147 (358) 334
Net loss on actuarial gains and losses, Recognized during the year 112 40 (345)
Income tax expense (benefit) charged to other comprehensive (loss) income $ 259 $ (318) $ (11)