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Pledged Assets and Debt - Secured Note Payable (Details) - USD ($)
$ in Thousands
11 Months Ended
Sep. 06, 2018
Dec. 12, 2018
Mar. 31, 2019
Dec. 31, 2018
Secured notes payable | 9.00% Secured Notes due June 2023        
Senior Note Payable        
Face amount of debt   $ 42,000 $ 40,000 $ 42,000
Interest rate (as a percent)   9.00% 9.00% 9.00%
Principal     $ 40,000 $ 42,000
Principal, noncurrent     40,000 42,000
Net principal     40,000 42,000
Net principal, noncurrent     $ 40,000 $ 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