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Income Taxes - Narrative (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Accrued interest and penalties related to uncertain tax positions	$ 0	$ 0
Operating loss carry-forwards	7,100,000	8,300,000	$ 37,300,000
Deferred tax assets, operating loss carry-forwards	14,510,000	12,758,000
Deferred tax assets, operating loss carryforwards, portion available after application of IRC Section 382 limitations	61,500,000
Operating loss, subject to expiration	37,300,000
Net deferred tax liabilities	0	$ 0
U.S. Federal
Operating Loss Carryforwards [Line Items]
Deferred tax assets, operating loss carry-forwards	115,900,000
State and Local
Operating Loss Carryforwards [Line Items]
Deferred tax assets, operating loss carry-forwards	$ 72,300,000

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