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Summary of Significant Accounting Policies, Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Nov. 03, 2020
Senior Secured Notes Due 2025 [Member]    
Fair Value of Financial Instruments [Abstract]    
Interest rate 12.50% 12.50%
Level 2 [Member]    
Fair Value of Financial Instruments [Abstract]    
Assets, fair value $ 0  
Liabilities, fair value $ 0