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Supporting Financial Information - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Interest expense $ (635) $ (297) $ (2,229) $ (485)
Amortization of deferred financing costs (178) (265) (551) (799)
Other income (expense), net 0 0 121 0
Interest expense, net $ (813) $ (562) $ (2,659) $ (1,284)