Income Taxes - Reconciliation Between Federal Statutory Rate and Income (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Loss from continuing operations before income taxes	$ (253,040)	$ (91,380)
U.S. federal statutory rate	21.00%	21.00%
Income tax benefit at U.S. federal statutory rate	$ (53,138)	$ (19,190)
NOLs derecognized due to Section 382 limitation	158,116	0
State taxes, net of federal benefit	(4,132)	580
Equity compensation shortfall	1,868	2,601
Change in estimates & other	2,936	206
Change in valuation allowance	(109,482)	15,824
Total income tax (benefit) expense	$ (3,832)	$ 21

Effective Income Tax Rate Reconciliation, Net Operating Loss Carryforward Derecognized, Amount

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

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount 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 increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of reported income tax expense (benefit) in excess of (less than) 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 award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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