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Income taxes - Components of pre-tax loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Components of pre-tax loss      
US $ (149,533) $ (138,016) $ (107,847)
Foreign (4,495) (1,533) 470
Loss before income taxes $ (154,028) $ (139,549) $ (107,377)