Income Taxes - Reduction of U.S. Corporate Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Income Taxes
U.S. federal statutory rate (as a percent)	21.00%	35.00%
Income tax benefit		$ (4.8)
Amount of reduction in net deferred tax assets		25.6
Reduction in valuation allowance		$ 30.4

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act.

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Amount of increase (decrease) in net deferred tax assets for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017.

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Amount of reduction in valuation allowance of deferred tax assets from effect of Tax Cuts and Jobs Act of 2017.

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