Equity - Schedule of Stock-based Compensation Expense - by Award Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,088	$ 903
Employee stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0	1
RSUs and RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	554	431
PSUs and PRSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	407	317
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0	89
Outside director equity awards and fees in common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 127	$ 65