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Income and Expenses Items - Summary of Other Income and Other Expenses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Analysis Of Income And Expense [Abstract]      
Other income $ 462 $ 1,712 $ 114
Dividend income 109 105 100
Net gain on financial instruments 146 (2) (332)
Total other income 717 1,817 214
Others 3 9 4
Net loss on financial instruments   2 332
Total other expenses $ 3 $ 11 $ 336