REVENUE RECOGNITION - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 46,968	$ 46,123	$ 83,885	$ 91,826
Deposits revenue
Disaggregation of Revenue [Line Items]
Total revenue	29,504	28,760	50,580	59,041
Deposits software and hardware | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Total revenue	22,494	22,226	36,542	46,679
Deposits services and other | Transferred over Time
Disaggregation of Revenue [Line Items]
Total revenue	7,010	6,534	14,038	12,362
Identity verification revenue
Disaggregation of Revenue [Line Items]
Total revenue	17,464	17,363	33,305	32,785
Identity verification software and hardware | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Total revenue	2,395	3,034	4,327	4,957
Identity verification services and other | Transferred over Time
Disaggregation of Revenue [Line Items]
Total revenue	$ 15,069	$ 14,329	$ 28,978	$ 27,828