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Supporting Financial Information - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Interest expense $ (83) $ (208) $ (187) $ (427)
Amortization of deferred financing costs (461) (67) (534) (132)
Other income (expense), net 0 14 0 20
Interest expense, net (544) $ (261) (721) $ (539)
Write-off of remaining financing costs related to debt fully satisfied $ 400   $ 400