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Supporting Financial Information - Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Prepaid insurance and benefits | $ 431 | $ 665
Other receivables | 1,617 | 1,363
Other prepaid expenses | 1,420 | 1,471
Other current assets | $ 3,468 | $ 3,499

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