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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) | 12 Months Ended
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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%

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