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Accounts payable and other noncurrent liabilities - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2021 USD ($) item	Jun. 30, 2021 USD ($) item	Feb. 28, 2021 USD ($) item
Vendor Agreement
Accounts payable and other noncurrent liabilities
Payable to vendor	$ 6,800	$ 6,800
Imputed interest rate	5.00%	5.00%
Number of vendor agreements | item	2	2
Percentage of Accounts Payable and Noncurrent Liabilities	40.00%	40.00%
Interest expense	$ 92	$ 121
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

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Percentage of accounts payable and noncurrent liabilities.

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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Reflects the effective interest rate as of the balance sheet date on interest-bearing trade payables.

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Amount of the cost of borrowed funds accounted for as interest expense.

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