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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Federal tax expense at statutory rate 21.00% 34.00% 34.00%
State income tax expense (net of federal income tax benefit) 4.00% 4.00% 4.00%
Permanent differences associated with general business credits 1.00% 1.00% 5.00%
Change in valuation allowance (25.00%) (148.00%) (15.00%)
Change in tax rate 0 0.02 0
Other permanent differences (1.00%) 1.00% (2.00%)
Other 0.00% (2.00%) (1.00%)
Net income tax expense 0.00% (108.00%) 25.00%