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Basis of Presentation and Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Valuation allowance $ 26,153 $ 26,427
Deferred tax assets, gross 26,153  
Additional tax benefit as a result of anticipated NOL carryback $ 1,172