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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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Accounts payable and other noncurrent liabilities
Imputed interest rate	5.60%		5.60%
Interest expense	$ 74	$ 57	$ 185	$ 203
Payable to vendor	$ 3,300		$ 3,300		$ 16,100
Percentage of accounts payable and noncurrent liabilities	21.00%		21.00%		63.00%

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

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