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Accounts receivable, net - (Details) - USD ($)
$ in Thousands
3 Months Ended
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