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Reconciliation of Effective Tax Rate Related to Statutory United States Federal Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Taiwan statutory rate, including taxes on income and retained earnings | 24.00% | 24.00% | 24.00%
Foreign tax differential | 0.75% | (3.03%) | (5.75%)
Expiration of net operating loss carryforwards | (27.71%) | (20.18%) | (6.47%)
Net operating loss carryforwards not utilized due to dissolution of subsidiaries |  | (42.73%) |
Other non-deductible expenses | (12.84%) | (9.79%) | (1.65%)
Change in deferred tax assets and valuation allowance | 15.79% | 24.94% | (10.32%)
Loss on investment in subsidiaries dissolved |  | 26.62% |
Other | 0.01% | 0.17% | 0.19%

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