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Other Income/Expenses and Adjustments - Summary of Other Income and Other Expenses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Analysis Of Income And Expense [Abstract]      
Other income $ 114    
Dividend income 100 $ 96 $ 99
Net gain on financial instruments (332) 171 20
Total other income 214 267 119
Others 4 94 180
Net loss on financial instruments 332    
Total other expenses $ 336 $ 94 $ 180