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Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Taxes (Details) [Line Items]
Deferred tax valuation asset	$ 5.5	$ 19.4
Federal net operating loss (“NOL”) carryforwards	$ 22.0
Taxable income limitation	80.00%
Taxable income afterwards	80.00%
Unrecognized tax benefits	$ 1.6
Federal income tax returns description	The Company is still subject to examination for federal income tax returns for the years 2013 through 2020, for certain U.S. state income tax returns for the years 2009 through 2020, and for certain foreign income tax returns for the years 2011 through 2020. The Company is currently under examination by the Internal Revenue Service for the years 2012 through 2014 and by the California Franchise Tax Board for the years 2007 through 2012.
China [Member]
Income Taxes (Details) [Line Items]
NOL carryforwards	$ 10.1
Taiwan [Member]
Income Taxes (Details) [Line Items]
NOL carryforwards	20.9
Hong Kong [Member]
Income Taxes (Details) [Line Items]
NOL carryforwards	$ 2.3

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Income tax effects allocated directly to equity, cumulative effect of change in accounting principle.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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The amount of the valuation allowance recorded in a business combination against deductible temporary differences for which related tax benefits will be recorded as a reduction of the acquired entity's goodwill and other noncurrent intangible assets.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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