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Accounts payable and accrued expenses, and Other noncurrent liabilities - Narrative (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2021 USD ($)	Jul. 31, 2021 USD ($) item	Feb. 28, 2021 USD ($) item
Vendor Agreement
Accounts payable and other noncurrent liabilities
Payable to vendor	$ 7,800
Imputed interest rate	5.00%
Percentage of accounts payable and noncurrent liabilities	41.00%
Interest expense	$ 190
Vendor Agreement One
Accounts payable and other noncurrent liabilities
Payable to vendor			$ 1,500
Number of payments to be made | item			5
Vendor Agreement Two
Accounts payable and other noncurrent liabilities
Payable to vendor			$ 7,200
Number of payments to be made | item			6
Vendor Agreement Three
Accounts payable and other noncurrent liabilities
Payable to vendor		$ 500
Number of payments to be made | item		12

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