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v3.23.1

Reconciliation of Effective Tax Rate Related to Statutory United States Federal Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |
Taiwan statutory rate, including taxes on income and retained earnings | 24.00% | 24.00% | 24.00%
Foreign tax differential | (3.03%) | (5.75%) | (0.47%)
Expiration of net operating loss carryforwards | (20.18%) | (6.47%) | (31.92%)
Net operating loss carryforwards not utilized due to dissolution of subsidiaries | (42.73%) |  |
Other non-deductible expenses | (9.79%) | (1.65%) | (3.99%)
Change in deferred tax assets and valuation allowance | 24.94% | (10.32%) | 10.52%
Loss on investment in subsidiaries dissolved | 26.62% |  |
Other | 0.17% | 0.19% | 1.86%

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