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Income and Expenses Items - Summary of Other Operating Expenses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Analysis Of Income And Expense [Abstract]      
Allowance for trade receivables for related parties   $ 1 $ 27
Allowance for trade receivables   570 302
Allowance for other receivable $ 30 53  
Allowance for foreseeable loss 193   276
Impairment of property, plant and equipment 546 11 223
Other operating expenses – others 1 810 81
Total other operating expenses $ 770 $ 1,445 $ 909