Income Taxes (Reconciliation Of Federal Income Tax Rate To Effective Tax Rate) (Details)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax provision at U.S. statutory rate	21.00%	35.00%	35.00%
State income taxes, net of federal benefit	6.00%	2.00%	2.00%
Permanent items - other	1.00%	1.00%	2.00%
R&D credits	(2.00%)	(1.00%)	(3.00%)
Stock-based compensation	9.00%	(22.00%)	1.00%
Other	(1.00%)	(1.00%)	(1.00%)
Change in tax rate	1.00%	1.00%	0.00%
Provision for tax	35.00%	15.00%	36.00%

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 income tax rates.

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Effective Income Tax Rate Reconciliation Permanent Items Other

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