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Reconciliation of Effective Tax Rate Related to Statutory United States Federal Tax Rate (Detail)	12 Months Ended
	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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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