Leases (Details) - USD ($) $ in Thousands	12 Months Ended
Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Leases
Cash paid for operating lease liabilities	$ 1,893	$ 1,946
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 656	$ 733