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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)