REVENUE RECOGNITION - Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenue, Major Customer [Line Items]
Revenue	$ 45,729	$ 44,976	$ 134,912	$ 128,861
United States
Revenue, Major Customer [Line Items]
Revenue	35,354	35,902	103,430	102,193
United Kingdom
Revenue, Major Customer [Line Items]
Revenue	5,669		15,442	12,587
All other countries
Revenue, Major Customer [Line Items]
Revenue	$ 4,706	$ 9,074	$ 16,040	$ 14,081

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details