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Segment Information - Net Revenue from Customers Representing at Least 10% of Total Revenue (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Disclosure of major customers [Line Items] |  |  |  |
Net revenue | $ 21,356,228 | $ 697,460 | $ 23,517,064 | $ 27,400,035
Percentage of total revenue | 100.00% | 100.00% | 100.00% | 100.00%
Customer A [member] |  |  |  |
Disclosure of major customers [Line Items] |  |  |  |
Net revenue | $ 5,251,529 |  | $ 4,705,064 | $ 5,681,277
Percentage of total revenue | 25.00% | 25.00% | 20.00% | 21.00%
Customer B [Member] |  |  |  |
Disclosure of major customers [Line Items] |  |  |  |
Net revenue | $ 2,834,188 |  | $ 1,868,583 | $ 2,484,611
Percentage of total revenue | 13.00% | 13.00% | 8.00% | 9.00%
Customer M [Member] |  |  |  |
Disclosure of major customers [Line Items] |  |  |  |
Net revenue | $ 1,320,905 |  | $ 2,278,645 | $ 2,832,088
Percentage of total revenue | 6.00% | 6.00% | 10.00% | 10.00%

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