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Other Income - Summary of Other income (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Analysis of other income [Abstract]        
Rental income $ 10,260   $ 9,249 $ 7,819
Dividend income 3,229   585 571
Grant income 7,668   925  
Other non-operating income (expenses), net $ 21,157 $ 753 $ 10,759 $ 8,390