REVENUE RECOGNITION - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Total revenue	$ 54,038	$ 45,729	$ 153,123	$ 134,912
Fraud and identity solutions
Disaggregation of Revenue [Line Items]
Total revenue	29,031	25,535	80,201	65,223
SaaS
Disaggregation of Revenue [Line Items]
Total revenue	24,833	18,100	65,728	52,183
Software license and support
Disaggregation of Revenue [Line Items]
Total revenue	3,612	6,944	12,609	11,509
Professional services and other
Disaggregation of Revenue [Line Items]
Total revenue	586	491	1,864	1,531
Check verification solutions
Disaggregation of Revenue [Line Items]
Total revenue	25,007	20,194	72,922	69,689
SaaS
Disaggregation of Revenue [Line Items]
Total revenue	1,319	1,161	3,881	3,500
Software license and support
Disaggregation of Revenue [Line Items]
Total revenue	23,408	18,846	67,927	65,454
Professional services and other
Disaggregation of Revenue [Line Items]
Total revenue	280	187	1,114	735
SaaS
Disaggregation of Revenue [Line Items]
Total revenue	26,152	19,261	69,609	55,683
Software license and support
Disaggregation of Revenue [Line Items]
Total revenue	27,020	25,790	80,536	76,963
Professional services and other
Disaggregation of Revenue [Line Items]
Total revenue	$ 866	$ 678	$ 2,978	$ 2,266