Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Leases [Abstract]
Operating lease cost	$ 573	$ 629	$ 1,143	$ 1,237
Less: sublease income	(173)	(177)	(347)	(357)
Variable lease cost	117	109	258	217
Short-term lease cost	579	319	852	488
Total lease cost	$ 1,096	$ 880	$ 1,906	$ 1,585