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Other Non-operating Income (Expenses), Net - Summary of Other Non-operating Income (Expenses), Net (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Analysis of other non-operating income and expense [abstract]        
Bank deposits $ 59,901   $ 49,051 $ 53,123
Financial assets at amortized cost 4,467   920  
Foreign exchange gains (losses), net (154,993)   93,104 (418,970)
Gain on valuation of financial assets at fair value through profit or loss 1,317   1,485 637
Rental income 9,249   7,819 11,075
Dividend income 585   571  
Reimbursement of ADSs service charge 4,292   13,269 23,707
Grant income 925      
Others 970   6,851 2,808
Other non-operating income (expenses), net $ (73,287) $ (2,450) $ 173,070 $ (327,620)