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Other Income/Expenses and Adjustments - Summary of Finance Costs and Finance Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Analysis Of Income And Expense [Abstract]      
Interest on debts and borrowings $ 962 $ 958 $ 1,300
Finance charges payable under finance leases and hire purchase contracts 4 4 4
Total interest expenses 966 962 1,304
Banking charges 255 185 243
Total finance costs 1,221 1,147 1,547
Interest income 876 1,045 697
Interest income $ 876 $ 1,045 $ 697