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Other Income/Expenses and Adjustments - Summary of Other Operating Expenses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Analysis Of Income And Expense [Abstract]      
Allowance for trade receivables for related parties $ 27    
Allowance for trade receivables 302 $ 279 $ 332
Allowance for other receivable   191  
Allowance for foreseeable loss 276 236  
Impairment of property, plant and equipment 223 2,524 0
Loss on disposal of assets classified as held for sale (4,525) 11  
Other operating expenses - others 81 145  
Total other operating expenses $ 909 $ 3,386 $ 332