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Supporting Financial Information - Other Current Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Sep. 30, 2019
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Prepaid insurance and benefits | $ 833 | $ 495
Other receivables | 1,407 | 301
Other prepaid expenses | 1,532 | 1,035
Other current assets | $ 3,772 | $ 1,831

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