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Accounts payable and accrued expenses, and Other noncurrent liabilities - Narrative (Details) - Vendor Agreement - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Accounts payable and other noncurrent liabilities |  |
Imputed interest rate | 7.90% |
Interest expense | $ 219 | $ 229

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