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Accounts receivable, net (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Accounts receivable, net |  |  |  |
Allowance for Doubtful Accounts Receivable, Current, Beginning Balance | $ 61 | $ 115 | $ 100 | $ 88
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 |  |
Provision for credit losses | 12 | (9) | 40 | 18
Allowance for Doubtful Accounts Receivable, Current, Ending Balance | 73 | 106 | 73 | $ 106
Adoption of Accounting Standards Update 2016-13 |  |  |  |
Accounts receivable, net |  |  |  |
Allowance for Doubtful Accounts Receivable, Current, Beginning Balance | $ 0 | $ 0 | $ (67) |

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