Accounts payable and other noncurrent liabilities - Agreements with Vendors (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021
Accounts payable and other noncurrent liabilities
Accounts payable and accrued expenses	$ 10,116	$ 13,928
Other noncurrent liabilities	4,376	$ 4,783
Vendor Agreement
Accounts payable and other noncurrent liabilities
Current	1,758		$ 2,727
Less: discount	223		288
Accounts payable and accrued expenses	1,535		2,439
Noncurrent	4,452		5,590
Less: discount	215		403
Other noncurrent liabilities	$ 4,237		$ 5,187