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Income Taxes Effective Tax Rate Reconciliation (Details)			12 Months Ended
	Dec. 22, 2017	Dec. 21, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory federal income tax rate	(21.00%)	(35.00%)	(35.00%)	(35.00%)	(35.00%)
State tax benefit			(3.90%)	0.60%	(0.00%)
Increase in fair value of common stock warrants			4.30%	0.80%	(0.00%)
Reorganization costs			(0.00%)	3.30%	7.00%
Other			(1.80%)	0.20%	1.40%
U.S. federal tax law change			(5.10%)	(0.00%)	(0.00%)
Valuation allowance on deferred tax assets			36.00%	30.10%	27.80%
Effective tax rate			(5.50%)	(0.00%)	1.20%

X

- Definition

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in the fair value of common warrants.

+ References

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in reorganization costs.

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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 changes in the income tax rates.

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