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Income Tax - Reconciliation of Statutory Tax Rate and Effective Tax Rate (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Abstract]      
Profit before tax $ 1,106 $ 11,332 $ 18,668
Tax at statutory rate of 20% (2018: 20%; 2017: 20%) 221 2,266 3,734
Foreign income taxed at different rate 499 697 1,151
Expenses not deductible for tax purpose 221 (33) 600
Utilization of previously unrecognized tax losses   (128) (1,066)
Tax benefit arising from previously unrecognized tax losses   (298) (137)
Net deferred tax asset not recognized 949 679 78
Written-off deferred tax 218 (4) 10
Tax exempt on income (144) (135) (245)
Uncertain tax position (454) 11 (270)
Return to provision adjustment (16) 1 348
Deferred tax liability arising from undistributed earnings 215 578 602
Withholding tax on dividends 355 270 349
Others (7) (18) (14)
Income tax expense reported in the income statement $ 2,057 $ 3,886 $ 5,140