Accounts payable and Other noncurrent liabilities - Agreements with Vendors (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Accounts payable and other noncurrent liabilities
Accounts payable and accrued expenses	$ 13,924	$ 22,463
Other noncurrent liabilities	1,823	3,046
Vendor Agreement
Accounts payable and other noncurrent liabilities
Current	1,925	1,758
Less: discount	160	184
Accounts payable and accrued expenses	1,765	1,574
Noncurrent	1,967	3,186
Less: discount	142	138
Other noncurrent liabilities	$ 1,825	$ 3,048