Leases - Summary of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finance lease costs:
Amortization of right of use asset	$ 109	$ 141
Interest on lease liability	14	15
Operating lease cost	1,558	2,071
Variable lease cost	877	178
Sublease income	(48)	(53)
Total lease cost	$ 2,510	$ 2,352