Supporting Financial Information - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest expense	$ (386)	$ (801)	$ (907)	$ (1,671)
Amortization of deferred financing costs	(168)	(203)	(319)	(413)
Interest expense, net	$ (554)	$ (1,004)	$ (1,226)	$ (2,084)