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Debt - Term Loans (Details)
$ in Thousands
Nov. 15, 2018
USD ($)
loan
installment
Sep. 30, 2021
USD ($)
Sep. 30, 2019
loan
Debt Instrument [Line Items]      
Deferred financing costs   $ 323  
Outstanding principal balance   50,000  
Secured Debt      
Debt Instrument [Line Items]      
Number of term loans | loan     2
Secured Debt | Five-year Term Loans Maturing 2021      
Debt Instrument [Line Items]      
Number of term loans | loan 3    
Debt instrument, term 5 years    
Face amount $ 3,300    
Number of installments | installment 8    
Installment payment, percentage of initial principal amount (as a percent) 12.50%    
Deferred financing costs   $ 0  
Secured Debt | Five-year Term Loans Maturing 2021 | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate (as a percent) 3.10%    
Secured Debt | One-year Term Loans Maturing 2019      
Debt Instrument [Line Items]      
Number of term loans | loan 2    
Debt instrument, term 1 year    
Face amount $ 3,200    
Secured Debt | One-year Term Loans Maturing 2019, Loan One      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage (as a percentage) 4.56%    
Secured Debt | One-year Term Loans Maturing 2019, Loan Two      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage (as a percentage) 4.35%