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Financing receivables, net - Contractual maturities of outstanding financing receivables (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | --- | --- | --- | ---
Financing receivables, net |  |  |  |  |  |
2024 | $ 5,288 |  |  |  |  |
2025 | 3,497 |  |  |  |  |
2026 | 1,069 |  |  |  |  |
2027 | 628 |  |  |  |  |
Total payments | 10,482 |  |  |  |  |
Less: unearned interest income | (609) |  | $ (859) |  |  |
Less: allowance for credit losses | (70) | $ (77) | $ 0 | $ 0 | $ 0 | $ 0
Total, net of unearned interest income and allowance for credit losses | $ 9,803 |  |  |  |  |

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