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Pledged Assets and Debt - Secured Note Payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 12, 2018
Sep. 06, 2018
Secured notes payable | 9.00% Secured Notes due June 2023        
Senior Note Payable        
Face amount of debt     $ 42,000  
Interest rate (as a percent)     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%
Subsidiary notes payable        
Senior Note Payable        
Principal 74,731 71,838    
Principal, current 128 884    
Principal, noncurrent 74,603 70,954    
Deferred issuance costs 373 16    
Deferred issuance costs, current 1 0    
Deferred Issuance costs, noncurrent 372 16    
Net principal 74,358 71,822    
Net principal, current 127 884    
Net principal, noncurrent $ 74,231 $ 70,938