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Income and Expenses Items - Summary of Finance Costs and Finance Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Analysis Of Income And Expense [Abstract]      
Interest on debts and borrowings $ 1,196 $ 962 $ 958
Finance charges payable under finance leases 4 4 4
Total interest expenses 1,200 966 962
Banking charges 178 255 185
Total finance costs 1,378 1,221 1,147
Interest income 482 876 1,045
Interest income $ 482 $ 876 $ 1,045