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Income Tax - Reconciliation of Difference Between Tax Computed at Statutory Tax Rate and Income Tax (Benefits) Expenses (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Abstract] |  |  |
(Loss)/profit before tax | $ (9,857) | $ 7,725 | $ 1,106
Tax at statutory rate of 20% (2020: 20%; 2019: 20%) | (1,971) | 1,545 | 221
Foreign income taxed at different rate | 1,465 | 1,100 | 499
Expenses not deductible for tax purpose | 94 | 255 | 221
Utilization of previously unrecognized tax losses | (96) | (89) |
Tax benefit arising from previously unrecognized tax losses |  | (52) |
Net deferred tax asset not recognized | 327 | 1,151 | 949
Written-off deferred tax |  |  | 218
Tax exempt on income | (99) | (57) | (144)
Uncertain tax position | (1,173) | (273) | (454)
Return to provision adjustment |  | (1) | (16)
Deferred tax liability arising from undistributed earnings | (309) | 270 | 215
Withholding tax on dividends | 452 | 163 | 355
Others | (35) | 4 | (7)
Income tax (benefit) expense reported in the income statement | $ (1,345) | $ 4,016 | $ 2,057

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