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Stockholders' Equity - Stock Based Compensation Expense by Function (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock compensation expense	$ 4,350	$ 2,578	$ 10,524	$ 6,010
Technology and operations
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock compensation expense	682	427	1,623	978
Sales and marketing
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock compensation expense	1,427	853	3,333	1,875
General and administrative
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total stock compensation expense	$ 2,241	$ 1,298	$ 5,568	$ 3,157

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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