Supporting Financial Information - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest expense	$ (742)	$ (83)	$ (1,593)	$ (187)
Amortization of deferred financing costs	(164)	(461)	(374)	(534)
Other income (expense), net	0	0	121	0
Interest expense, net	$ (906)	$ (544)	$ (1,846)	$ (721)