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Supporting Financial Information - Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Interest expense | $ (297) | $ (192) | $ (485) | $ (619)
Amortization of deferred financing costs | (265) | (70) | (799) | (202)
Other income (expense), net | 0 | 0 | 0 | 20
Interest expense, net | (562) | $ (262) | (1,284) | $ (801)
Write-off of remaining financing costs related to debt fully satisfied | $ 200 |  | $ 600 |

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