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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 |

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