Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Operating lease cost	$ 378	$ 573	$ 755	$ 1,143
Less: sublease income	(163)	(173)	(324)	(347)
Variable lease cost	88	117	195	258
Short-term lease cost	430	579	817	852
Total lease cost	$ 733	$ 1,096	$ 1,443	$ 1,906