Income Taxes - Reconciliation of Differences between United States Statutory Federal Income Tax Rate and Effective Tax Rate (Details)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax computed at the federal statutory rate	21.00%	34.00%
State income taxes, net of federal benefits	2.70%	5.80%
Tax reform—tax rate change		(18.60%)
Nondeductible expenses	(2.00%)
Other	(2.20%)
Change in valuation allowance	(19.50%)	(21.20%)

Effective income tax rate reconciliation Tax Cuts and Jobs Act of 2017 change in tax rate.

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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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