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Income Taxes (Reconciliation of Federal Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Statutory tax rate	21.00%	21.00%	21.00%
State tax rate, net of federal benefit	(8.30%)	4.90%	3.50%
Stock-based compensation	(15.20%)	(0.80%)	(1.60%)
Tax credits	(3.60%)	2.20%	2.00%
Other	(0.20%)	0.20%	(0.10%)
Change in valuation allowance	6.30%	(27.50%)	(24.80%)
Total

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Effective Income Tax Rate Reconciliation, Tax Credit,

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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 difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement.

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