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Income Tax - Reconciliation of Difference Between Tax Computed at Statutory Tax Rate and Income Tax Expenses (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Abstract] |  |  |
Profit before tax | $ 7,725 | $ 1,106 | $ 11,332
Tax at statutory rate of 20% (2019: 20%; 2018: 20%) | 1,545 | 221 | 2,266
Foreign income taxed at different rate | 1,100 | 499 | 697
Expenses not deductible for tax purpose | 255 | 221 | (33)
Utilization of previously unrecognized tax losses | (89) |  | (128)
Tax benefit arising from previously unrecognized tax losses | (52) |  | (298)
Net deferred tax asset not recognized | 1,151 | 949 | 679
Written-off deferred tax |  | 218 | (4)
Tax exempt on income | (57) | (144) | (135)
Uncertain tax position | (273) | (454) | 11
Return to provision adjustment | (1) | (16) | 1
Deferred tax liability arising from undistributed earnings | 270 | 215 | 578
Withholding tax on dividends | 163 | 355 | 270
Others | 4 | (7) | (18)
Income tax expense reported in the income statement | $ 4,016 | $ 2,057 | $ 3,886

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