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Profit Before Income Tax - Summary of Employees' Compensation and Remuneration to Directors (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
Analysis Of Income And Expense [line items] |  |  |  |
Employees' compensation | $ 121,935 | $ 4,396 | $ 54,909 |
Remuneration to directors | $ 195,095 | $ 7,033 | 109,818 |
Resolved by the board of directors [member] |  |  |  |
Analysis Of Income And Expense [line items] |  |  |  |
Employees' compensation |  |  | 54,909 | $ 34,400
Remuneration to directors |  |  | 109,000 | 68,800
Recognized in the consolidated financial statements [member] |  |  |  |
Analysis Of Income And Expense [line items] |  |  |  |
Employees' compensation |  |  | 54,909 | 34,400
Remuneration to directors |  |  | $ 109,818 | $ 68,803

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