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Summary of Significant Accounting Policies - Additional Information (Detail) | Dec. 31, 2021 TWD-USD shares | Dec. 31, 2020 shares
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Disclosure of subsidiaries [line items] |  |
Convenience exchange rate | TWD-USD | 27.74 |
Number of shares in entity held by entity | 72,941,000 | 72,941,000
Bottom of range [member] |  |
Disclosure of subsidiaries [line items] |  |
Number of shares in entity held by entity | 1 |
Percentage of total shares held in Subsidiaries | 0.10% |

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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Details
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