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Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Income Tax Examination [Line Items]      
Net operating loss $ 14,510 $ 12,758  
Deferred tax assets, operating loss carryforwards, portion available after application of IRC Section 382 limitations 61,500    
Operating loss carry-forwards 7,100 $ 8,300 $ 37,300
U.S. Federal      
Income Tax Examination [Line Items]      
Net operating loss 115,900    
State and Local      
Income Tax Examination [Line Items]      
Net operating loss $ 72,300