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Income Tax Expense - Schedule of Rates of Tax Applicable in Countries (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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) |

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