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Credit Facilities - Summary of Loan Facility (Details) - Secured Debt - USD ($)
3 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Line of Credit Facility [Line Items]    
Total bank debt obligation $ 56,000,000 $ 56,000,000
Term Loans    
Line of Credit Facility [Line Items]    
Secured term loan, face amount 70,000,000  
Total bank debt obligation $ 56,000,000  
Term Loans | LIBOR    
Line of Credit Facility [Line Items]    
Interest rate percentage 1.71%  
Basis spread on variable rate percentage 3.50%  
Revolving Line of Credit    
Line of Credit Facility [Line Items]    
Secured revolving line of credit ceiling $ 25,000,000  
Total bank debt obligation $ 1,800,000  
Revolving Line of Credit | LIBOR    
Line of Credit Facility [Line Items]    
Basis spread on variable rate percentage 3.50%