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Income Taxes - Reconciliation of (Benefit) Provision for Income Taxes at Statutory Federal Tax Rate to Company's Actual Income Tax (Benefit) Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Computed at federal statutory rate	$ 24,404	$ (58,574)	$ (94,354)
State taxes, net of federal benefit	3,012	(10,898)	(20,500)
Non-deductible expenses	83	18	137
Stock-based compensation	(541)	643	602
Return to provision adjustments	(221)	(945)	(6,096)
Refund of AMT Sequestration	0	(646)	0
Change in valuation allowance	(26,733)	69,285	120,211
Other	(4)	471	0
Total (benefit) provision	$ 0	$ (646)	$ 0

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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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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 income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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