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Balance sheet components - Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
Balance Sheet Related Disclosures [Abstract]    
Trade receivables $ 37,274 $ 35,706
Other receivables 5,569 4,822
Allowance for doubtful accounts (263) (234)
Accounts receivable, net $ 42,580 $ 40,294