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Equity - Summary of Share Capital (Detail)
shares in Thousands, $ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
TWD ($)
shares
Disclosure of classes of share capital [abstract]      
Numbers of shares authorized (in thousands) 5,500,000 5,500,000 5,000,000
Numbers of shares reserved (in thousands) Employee share options 400,000 400,000 400,000
Number of shares issued and fully paid (in thousands) 4,351,592 4,351,592 4,330,528
Share capital authorized $ 55,000,000 $ 1,958,689 $ 50,000,000
Share capital reserved Employee share options 4,000,000 142,450 4,000,000
Share capital issued and fully paid $ 43,515,920 $ 1,549,712 $ 43,305,287