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Income and Expenses Items - Summary of Employee Benefits Expenses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Other Operating Income Expense [Line Items]      
Total employee benefits expenses $ 29,293 $ 30,137 $ 30,793
Included in cost of sales [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Wages and salaries 13,065 14,429 13,674
Labor and health insurance costs 71 126 162
Pension costs 736 994 890
Other employment benefits 702 816 892
Included in selling expenses [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Wages and salaries 3,557 3,495 3,685
Labor and health insurance costs 7 12 14
Pension costs 300 330 324
Other employment benefits 14 50 68
Included in general and administrative expenses [Member]      
Disclosure Of Other Operating Income Expense [Line Items]      
Wages and salaries 8,861 8,117 8,818
Labor and health insurance costs 89 85 224
Pension costs 640 757 671
Director fees 1,065 640 1,046
Other employment benefits $ 186 $ 286 $ 325