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Accounts receivable, net - (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Allowance for credit losses for accounts receivable: |  |
Balances at beginning of the period | $ 147 | $ 100
Provision for credit losses | 6 | 28
Balances at end of the period | 153 | 61
Adoption of Accounting Standards Update 2016-13 |  |
Allowance for credit losses for accounts receivable: |  |
Balances at beginning of the period | $ 0 | $ 67

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