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Related Party Loan (Details) - Unit holder of Parent - USD ($)
3 Months Ended 9 Months Ended
Aug. 22, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Senior Secured Loan            
Related Party Transaction [Line Items]            
Balance of Senior Secured Loan           $ 41,800,000
Interest expense   $ 300,000 $ 500,000 $ 3,800,000 $ 4,100,000  
Senior Secured Loan | Secured Debt            
Related Party Transaction [Line Items]            
Senior secured promissory note $ 38,600,000          
Stated rate 12.00%          
Tranche A | Secured Debt            
Related Party Transaction [Line Items]            
Senior secured promissory note $ 22,500,000          
Tranche B | Secured Debt            
Related Party Transaction [Line Items]            
Senior secured promissory note $ 16,100,000