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Income Taxes (Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	(26.00%)	(18.00%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	(18.00%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	2.00%	(2.00%)
Effective Income Tax Rate Reconciliation, State Income Tax Expense, Net of Federal Benefit, Percent	0.00%	(1.00%)
Effective Income Tax Rate Reconciliation, Uncertain Tax Positions	1.00%	(1.00%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent	0.00%	(1.00%)
Effective Income Tax Rate Reconciliation, Percent	(3.00%)	(1.00%)
State and Local Jurisdiction [Member]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	(1.00%)	1.00%

X

- Definition

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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