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REVENUE RECOGNITION - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenue	$ 43,070	$ 39,195	$ 134,896	$ 105,178
Deposits revenue
Disaggregation of Revenue [Line Items]
Total revenue	24,804	21,965	83,845	62,244
Identity verification revenue
Disaggregation of Revenue [Line Items]
Total revenue	18,266	17,230	51,051	42,934
Transferred at Point in Time | Deposits software and hardware
Disaggregation of Revenue [Line Items]
Total revenue	18,300	16,955	64,979	46,574
Transferred at Point in Time | Identity verification software and hardware
Disaggregation of Revenue [Line Items]
Total revenue	3,147	2,560	8,104	6,536
Transferred over Time | Deposits services and other
Disaggregation of Revenue [Line Items]
Total revenue	6,504	5,010	18,866	15,670
Transferred over Time | Identity verification services and other
Disaggregation of Revenue [Line Items]
Total revenue	$ 15,119	$ 14,670	$ 42,947	$ 36,398

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