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Revolving Credit Facility - Components of Interest Expense (Details) - Line of Credit - Revolving Credit Facility - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Line of Credit Facility [Line Items]        
Interest expense, net of capitalized interest $ 393 $ 956 $ 1,289 $ 2,958
Amortization of debt financing costs 182 168 655 483
Unused commitment fees 122 47 327 130
Total interest expense, net $ 697 $ 1,171 2,271 $ 3,571
Write-off of unamortized deferred financing costs     $ 100