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	$ 863	$ 890	$ 1,815	$ 1,860
Short-term	25	42	52	71
Variable	27	25	45	30
Sublease income	(50)	(92)	(119)	(187)
Total lease costs	$ 865	$ 865	$ 1,793	$ 1,774