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Supporting Financial Information - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Interest expense $ (852) $ (104)
Amortization of deferred financing costs (210) (73)
Other income (expense), net 121 0
Interest expense, net $ (941) $ (177)