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Revenue Recognition - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 39,333	$ 31,778	$ 106,520	$ 86,526
Deposits revenue
Disaggregation of Revenue [Line Items]
Total revenue	21,920	20,780	62,275	53,592
Identity verification revenue
Disaggregation of Revenue [Line Items]
Total revenue	17,413	10,998	44,245	32,934
Transferred at Point in Time | Deposits software and hardware
Disaggregation of Revenue [Line Items]
Total revenue	16,910	15,817	46,605	38,705
Transferred at Point in Time | Identity verification software and hardware
Disaggregation of Revenue [Line Items]
Total revenue	2,910	1,156	7,940	3,583
Transferred over Time | Deposits services and other
Disaggregation of Revenue [Line Items]
Total revenue	5,010	4,963	15,670	14,887
Transferred over Time | Identity verification services and other
Disaggregation of Revenue [Line Items]
Total revenue	$ 14,503	$ 9,842	$ 36,305	$ 29,351

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