Stockholders' Equity - Stock Based Compensation Expense by Function (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock compensation expense	$ 2,617	$ 2,195	$ 7,208	$ 6,216
Technology and operations
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock compensation expense	405	356	1,085	948
Sales and marketing
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock compensation expense	692	612	1,967	1,780
General and administrative
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock compensation expense	$ 1,520	$ 1,227	$ 4,156	$ 3,488