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Income Taxes (Reconciliation of U.S. Federal Statuatory Rate to our Effective Rate) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	21.00%
Expiration of tax attributes	(14.00%)	(38.00%)
Impact of foreign earnings	(7.00%)	(25.00%)
Permanent items	(1.00%)	3.00%
Research and development credits	1.00%	7.00%
Stock-based compensation	(2.00%)	(5.00%)
Change in valuation allowance	0.00%	31.00%
Tax contingencies, net of reversals	0.00%	1.00%
Effective income tax rate	(2.00%)	(5.00%)

X

- Definition

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the expiration of tax attributes.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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