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v3.25.1

Reconciliation of Effective Tax Rate Related to Statutory United States Federal Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Disclosure [Abstract] |  |  |
Taiwan statutory rate, including taxes on income and retained earnings | 24.00% | 24.00% | 24.00%
Foreign tax differential | (82.00%) | 0.75% | (3.03%)
Expiration of net operating loss carryforwards | (51.15%) | (27.71%) | (20.18%)
Net operating loss carryforwards not utilized due to dissolution of subsidiaries |  |  | (42.73%)
Other non-deductible expenses | 46.42% | (12.84%) | (9.79%)
Change in deferred tax assets and valuation allowance | 62.70% | 15.79% | 24.94%
Loss on investment in subsidiaries dissolved |  |  | 26.62%
Other | 0.03% | 0.01% | 0.17%

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