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Income and Expenses Items - Summary of Finance Costs and Finance Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Analysis Of Income And Expense [Abstract]      
Interest on debts and borrowings $ 754 $ 1,196 $ 962
Interest on leases liabilities 91 4 4
Total interest expenses 845 1,200 966
Banking charges 167 178 255
Total finance costs 1,012 1,378 1,221
Interest income 506 482 876
Total finance income $ 506 $ 482 $ 876