Accounts payable and other noncurrent liabilities - Agreements with Vendors (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Sep. 30, 2020
Accounts payable and other noncurrent liabilities
Accounts payable and accrued expenses	$ 10,145	$ 8,523
Other noncurrent liabilities	5,304	$ 202
Vendor Agreement
Accounts payable and other noncurrent liabilities
Current	2,727
Less: discount	288
Accounts payable and accrued expenses	2,439
Noncurrent	5,590
Less: discount	403
Other noncurrent liabilities	$ 5,187