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Equity - Summary of Share Capital (Detail) shares in Thousands, $ in Thousands, $ in Thousands | Dec. 31, 2021 TWD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 TWD ($) shares
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Disclosure of classes of share capital [abstract] |  |  |
Numbers of shares authorized (in thousands) | 5,500,000 | 5,500,000 | 5,500,000
Numbers of shares reserved (in thousands) Employee share options | 400,000 | 400,000 | 400,000
Number of shares issued and fully paid (in thousands) | 4,408,650 | 4,408,650 | 4,351,592
Share capital authorized | $ 55,000,000 | $ 1,982,696 | $ 55,000,000
Share capital reserved Employee share options | $ 4,000,000 | $ 144,196 | $ 4,000,000

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