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Accounts receivable, net - (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Allowance for credit losses for accounts receivable: |  |  |  |
Balances at beginning of the period | $ 153 | $ 61 | $ 147 | $ 100
(Benefit) provision for credit losses | (22) | 12 | (16) | 40
Balances at end of the period | $ 131 | $ 73 | $ 131 | 73
Adoption of Accounting Standards Update 2016-13 |  |  |  |
Allowance for credit losses for accounts receivable: |  |  |  |
Balances at beginning of the period |  |  |  | $ (67)

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