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Income Tax - Reconciliation of Statutory Tax Rate and Effective Tax Rate (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Abstract]      
Profit before tax $ 18,668 $ 6,535 $ (8,645)
Tax at statutory rate of 20% (2016: 20%; 2015: 20%) 3,734 1,307 (1,730)
Foreign income taxed at different rate 1,151 599 632
Expenses not deductible for tax purpose 600 225 393
Utilization of previously unrecognized tax losses (1,066) (21)  
Tax benefit arising from previously unrecognized tax losses (137)    
Net deferred tax asset not recognized 78 1,305 1,152
Written-off deferred tax 10 (678)  
Tax exempt on income (245) (21) (45)
Uncertain tax position (270) (3,010) (528)
Return to provision adjustment 348 77 (83)
Deferred tax liability arising from undistributed earnings 602 681 (72)
Effect of changes in temporary differences to be realized in different periods with different enacted tax rates     496
Withholding tax on dividends 349 118 206
Others (14) (72) 45
Income tax expense reported in the income statement $ 5,140 $ 510 $ 466