Leases - Lease Cost Components Schedule (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Finance lease expense:
Amortization of right-of use assets on finance leases	$ 2	$ 13	$ 14	$ 27
Interest on lease liabilities	0	1	0	2
Operating lease expense	429	540	828	1,092
Variable lease cost	30	35	60	69
Total lease expense	$ 461	$ 589	$ 902	$ 1,190