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Balance sheet components - Other current liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Sep. 30, 2021
Balance Sheet Related Disclosures [Abstract]    
Contingent consideration and holdbacks $ 10,004 $ 5,186
Income and sales taxes payable 3,588 2,440
Other current liabilities 2,431 1,997
Other current liabilities $ 16,023 $ 9,623