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Income Taxes (Reconciliation of Federal Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Statutory tax rate	21.00%	35.00%	35.00%
State tax rate, net of federal benefit	3.50%	8.60%	5.40%
Stock-based compensation	(1.60%)	(1.90%)	(1.60%)
Tax credits	2.00%	3.60%	5.00%
Remeasurement of deferred taxes due to tax reform		(123.30%)
Other	(0.10%)	0.30%	(0.90%)
Change in valuation allowance	(24.80%)	77.70%	(42.90%)
Total

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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