REVENUE RECOGNITION - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total revenue	$ 36,917	$ 45,703
Deposits revenue
Disaggregation of Revenue [Line Items]
Total revenue	21,077	30,281
Deposits software and hardware | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Total revenue	14,048	24,453
Deposits services and other | Transferred over Time
Disaggregation of Revenue [Line Items]
Total revenue	7,029	5,828
Identity verification revenue
Disaggregation of Revenue [Line Items]
Total revenue	15,840	15,422
Identity verification software and hardware | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Total revenue	1,932	1,923
Identity verification services and other | Transferred over Time
Disaggregation of Revenue [Line Items]
Total revenue	$ 13,908	$ 13,499