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Income Taxes (Reconciliation Of Federal Income Tax Rate) (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Abstract]      
Statutory tax rate 35.00% 35.00% 35.00%
State tax rate, net of federal benefit 5.40% (3.50%) 3.80%
Stock-based compensation (1.60%) (4.00%) (1.30%)
R&D credit 5.00% 11.00% 4.00%
Other (0.90%) (0.60%) 0.00%
Change in valuation allowance (42.90%) (37.90%) (41.50%)
Effective income tax rate 0.00% 0.00% 0.00%