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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal tax expense at statutory rate	34.00%	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%	5.00%	(3.00%)
Change in valuation allowance	(148.00%)	(15.00%)	3.00%
Change in tax rate	0.02	0.00	0.00
Other permanent differences	1.00%	(2.00%)	7.00%
Other	(2.00%)	(1.00%)	1.00%
Net income tax expense	(108.00%)	25.00%	46.00%

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Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Percent

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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 valuation allowance for deferred tax assets.

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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 other nondeductible expenses.

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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 research tax credit.

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