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Income and Expenses Items - Summary of Other Income and Other Expenses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Analysis Of Income And Expense [Abstract]      
Government grant received $ 973 $ 425 $ 106
Dividend income 108 109 105
Net gain on financial instruments 3 146  
Other income 89 37 1,606
Total other income 1,173 717 1,817
Others 1 3 9
Net loss on financial instruments     2
Total other expenses $ 1 $ 3 $ 11