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Pledged Assets and Debt - Secured Note Payable (Details) - USD ($)
$ in Thousands
11 Months Ended
Sep. 06, 2018
Dec. 12, 2018
Dec. 31, 2018
Secured notes payable | 9.00% Secured Notes due June 2023      
Senior Note Payable      
Face amount of debt   $ 42,000 $ 42,000
Interest rate (as a percent)   9.00% 9.00%
Principal     $ 42,000
Principal, noncurrent     42,000
Net principal     42,000
Net principal, noncurrent     $ 42,000
Secured notes payable | 9.00% Secured Notes due September 2020      
Senior Note Payable      
Face amount of debt $ 42,000    
Interest rate (as a percent) 9.00%    
Proceeds from secured notes payable $ 42,000    
Predecessor      
Senior Note Payable      
Proceeds from secured notes payable   $ 42,000