Income Taxes - Reconciliation (Details)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. statutory rate	21.00%	34.00%	34.00%
State taxes (net of federal tax benefit)	2.50%	2.30%	1.70%
Valuation allowance	(25.00%)	17.40%	(27.50%)
Deferred rate change due to changes in tax laws	0.00%	(51.70%)	0.00%
Other	1.40%	(1.00%)	(8.40%)
Effective income tax rate reconciliation	(0.10%)	1.00%	(0.20%)

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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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