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Accounts payable and Other noncurrent liabilities - (Details) - Vendor Agreement - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Accounts payable and other noncurrent liabilities |  |  |  |
Imputed interest rate | 8.40% |  | 8.40% |
Interest expense | $ 75 | $ 35 | $ 150 | $ 88

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