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Income Tax - Reconciliation of Statutory Tax Rate and Effective Tax Rate (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Abstract]      
Profit before tax $ 11,332 $ 18,668 $ 6,535
Tax at statutory rate of 20% (2017: 20%; 2016: 20%) 2,266 3,734 1,307
Foreign income taxed at different rate 697 1,151 599
Expenses not deductible for tax purpose (33) 600 225
Utilization of previously unrecognized tax losses (128) (1,066) (21)
Tax benefit arising from previously unrecognized tax losses (298) (137)  
Net deferred tax asset not recognized 679 78 1,305
Written-off deferred tax (4) 10 (678)
Tax exempt on income (135) (245) (21)
Uncertain tax position 11 (270) (3,010)
Return to provision adjustment 1 348 77
Deferred tax liability arising from undistributed earnings 578 602 681
Withholding tax on dividends 270 349 118
Others (18) (14) (72)
Income tax expense reported in the income statement $ 3,886 $ 5,140 $ 510