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Revenue Recognition - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Total revenue	$ 46,123	$ 33,510	$ 91,826	$ 65,982
Deposits revenue
Disaggregation of Revenue [Line Items]
Total revenue	28,760	21,228	59,041	40,279
Identity verification revenue
Disaggregation of Revenue [Line Items]
Total revenue	17,363	12,282	32,785	25,703
Transferred at Point in Time | Deposits software and hardware
Disaggregation of Revenue [Line Items]
Total revenue	22,226	15,990	46,679	29,619
Transferred at Point in Time | Identity verification software and hardware
Disaggregation of Revenue [Line Items]
Total revenue	3,034	2,160	4,957	3,976
Transferred over Time | Deposits services and other
Disaggregation of Revenue [Line Items]
Total revenue	6,534	5,238	12,362	10,660
Transferred over Time | Identity verification services and other
Disaggregation of Revenue [Line Items]
Total revenue	$ 14,329	$ 10,122	$ 27,828	$ 21,727

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