Income Taxes - Narrative (Details) - USD ($)		12 Months Ended
	May 29, 2020	Dec. 31, 2020	Dec. 31, 2019	May 28, 2020
Operating Loss Carryforwards [Line Items]
Income tax expense		$ 0	$ 0
Effective income tax rate		0.00%	0.00%
Change in valuation allowance		$ (146,794,000)	$ 24,609,000
Recapitalization transaction		157,855,000	0
Cancellation of debt income		15,360,000	0
Taxable loss caused by return to provision adjustments		(1,263,000)	3,847,000
Valuation allowance		109,724,000	256,517,000
Net operating loss carryovers		36,600,000	683,800,000
Net deferred tax assets	$ 94,100,000			$ 193,000,000.0
Gain on recapitalization	128,500,000
Deferred tax asset, recapitalization	$ 27,200,000
State | Colorado Department of Revenue
Operating Loss Carryforwards [Line Items]
Income tax expense		0	0
State | Nevada Department of Taxation
Operating Loss Carryforwards [Line Items]
Income tax expense		$ 0	$ 0