REVENUE RECOGNITION - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 51,929	$ 46,968	$ 89,183	$ 83,885
Deposits revenue
Disaggregation of Revenue [Line Items]
Total revenue	33,689	29,504	52,974	50,580
Deposits software and hardware | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Total revenue	24,700	22,494	35,797	36,542
Deposits services and other | Transferred over Time
Disaggregation of Revenue [Line Items]
Total revenue	8,989	7,010	17,177	14,038
Identity verification revenue
Disaggregation of Revenue [Line Items]
Total revenue	18,240	17,464	36,209	33,305
Identity verification software and hardware | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Total revenue	2,000	2,395	2,888	4,327
Identity verification services and other | Transferred over Time
Disaggregation of Revenue [Line Items]
Total revenue	$ 16,240	$ 15,069	$ 33,321	$ 28,978