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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]      
Deferred tax assets, operating loss carryforwards, portion available after application of IRC Section 382 limitations $ 61.5    
Operating loss carry-forwards 7.1 $ 8.3  
Operating loss, subject to expiration     $ 37.3
U.S. Federal, State and Local tax authorities      
Operating Loss Carryforwards [Line Items]      
Deferred tax assets, operating loss carry-forwards 115.9    
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Deferred tax assets, operating loss carry-forwards $ 72.3