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Income Tax Expense - Schedule of Rates of Tax Applicable in Countries (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Components of Income Tax Expense Benefit [Line Items]      
Charge for the year $ 993 $ 641 $ 626
Overprovision in prior year (800)    
Deferred tax (140) (242)  
Income tax expense (benefit) 4,314 13,405 14,059
Hong Kong [Member]      
Schedule of Components of Income Tax Expense Benefit [Line Items]      
Charge for the year 4,261 12,926 13,433
Overprovision in prior year (800)    
People's Republic of China [Member]      
Schedule of Components of Income Tax Expense Benefit [Line Items]      
Charge for the year 993 641 $ 626
Other jurisdictions [Member]      
Schedule of Components of Income Tax Expense Benefit [Line Items]      
Charge for the year   80  
Deferred tax $ (140) $ (242)