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Income Taxes (Reconciliation Of Federal Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Statutory tax rate	35.00%	35.00%	35.00%
State tax rate, net of federal benefit	8.60%	5.40%	(3.50%)
Stock-based compensation	(1.90%)	(1.60%)	(4.00%)
R&D credit	3.60%	5.00%	11.00%
Tax reform	(123.30%)
Other	0.30%	(0.90%)	(0.60%)
Change in valuation allowance	77.70%	(42.90%)	(37.90%)
Effective income tax rate	0.00%	0.00%	0.00%

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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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 research tax credit.

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