REVENUE RECOGNITION - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 44,976	$ 43,070	$ 128,861	$ 134,896
Deposits revenue
Disaggregation of Revenue [Line Items]
Total revenue	29,286	24,804	79,874	83,845
Deposits software and hardware | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Total revenue	21,793	18,300	58,335	64,979
Deposits services and other | Transferred over Time
Disaggregation of Revenue [Line Items]
Total revenue	7,493	6,504	21,539	18,866
Identity verification revenue
Disaggregation of Revenue [Line Items]
Total revenue	15,690	18,266	48,987	51,051
Identity verification software and hardware | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Total revenue	869	3,147	5,196	8,104
Identity verification services and other | Transferred over Time
Disaggregation of Revenue [Line Items]
Total revenue	$ 14,821	$ 15,119	$ 43,791	$ 42,947