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Reconciliation of Effective Tax Rate Related to Statutory United States Federal Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Taiwan statutory rate, including taxes on income and retained earnings	24.00%	24.00%	24.00%
Foreign tax differential	(5.75%)	(0.47%)	10.14%
Expiration of net operating loss carryforwards	(6.47%)	(31.92%)
Other non-deductible expenses	(1.65%)	(3.99%)	(7.01%)
Cumulative effect of initially applying new accounting standards			13.13%
Change in deferred tax assets and valuation allowance	(10.32%)	10.52%	(43.38%)
Other	0.19%	1.86%	3.12%

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Effective income tax rate reconciliation cumulative effect of initially applying new accounting standards.

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Effective income tax rate reconciliation expiration of net operating loss carryforwards.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
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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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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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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