Income Taxes - Reconciliation of the federal statutory income tax rate to the effective tax rate (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes
Federal corporate income tax rate	21.00%	35.00%	35.00%
Reconciliation of the federal statutory income tax rate to the effective tax rate
Federal statutory income tax rate (in percent)	21.00%	34.00%
State taxes, net of federal tax benefit (in percent)	6.00%	4.80%
Stock compensation (in percent)	1.10%	0.00%
Permanent items (in percent)	(1.20%)	(1.60%)
Tax Credits (in percent)	2.70%	2.60%
Foreign differential (in percent)	0.00%	0.00%
U.S. Tax Reform (in percent)	0.00%	(53.20%)
Other, net (in percent)	0.20%	(1.10%)
Valuation Allowance (in percent)	(29.90%)	14.50%
Effective income tax rate (in percent)	(0.10%)	0.00%
Aushon acquisition
Income Taxes
Amortizable goodwill	$ 0.4

Represents the federal corporate income tax rate during the period.

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The amount of goodwill related to historical tax basis.

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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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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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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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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