Income Taxes Income Taxes - Schedule of Effective Income Tax Reconciliation (Details)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax provision at federal statutory tax rate	21.00%	35.00%	35.00%
Non-deductible interest	(0.00%)	(0.00%)	(0.30%)
Permanent items	(0.30%)	(3.10%)	(3.50%)
Tax reform	(0.10%)	0.00%	0.00%
Change in valuation allowance	(20.70%)	(31.90%)	(31.20%)
Effective tax rate	(0.10%)	0.00%	0.00%

Effective Income Tax Rate Reconciliation, Expiration Of Net Operating Loss Carry Forwards

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Effective Income Tax Rate Reconciliation, Permanent Tax Differences

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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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