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Accounts payable and other noncurrent liabilities - Narrative (Details) - Vendor Agreement - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accounts payable and other noncurrent liabilities        
Imputed interest rate 5.00%   5.00%  
Interest expense $ 57 $ 92 $ 203 $ 121
Payable to vendor $ 6,500   $ 6,500  
Percentage of accounts payable and noncurrent liabilities 38.00%   38.00%