Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense at statutory federal rate	21.00%	21.00%
State income tax expense, net of federal benefit	0.30%	1.70%
Permanent differences and other	0.60%	(4.60%)
Transaction costs	(4.80%)	0.00%
Withholding costs	(0.30%)	(0.80%)
Tax credit	(0.00%)	(0.10%)
Impact of 2017 Tax Act	0.00%	0.00%
Change in effective federal and state tax rates	0.30%	(2.00%)
Expiration of net operating loss and tax credit carryovers	(43.50%)	0.00%
Stock compensation expense	0.00%	(2.40%)
Reserve for uncertain tax positions and other reserves	12.70%	0.00%
Change in valuation allowance	20.80%	16.10%
Provision for income taxes	7.10%	28.90%

Effective Income Tax Rate Reconciliation, Changes In Goodwill Valuation, Percent

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Effective Income Tax Rate Reconciliation, Expiration Of Net Operating Loss Carryovers

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Effective Income Tax Rate Reconciliation, Prior Year Tax Credits, Research

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Effective Income Tax Rate Reconciliation, Withholding Costs, Percent

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Effective Income Tax Reconciliation, Tax Cuts And Jobs Act Of 2017, Percent

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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 difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement.

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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 income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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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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