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Revenue Recognition - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 31,778	$ 25,413	$ 86,526	$ 70,672
Deposits revenue
Disaggregation of Revenue [Line Items]
Total revenue	20,780	16,948	53,592	46,221
Identity verification revenue
Disaggregation of Revenue [Line Items]
Total revenue	10,998	8,465	32,934	24,451
Transferred at Point in Time | Deposits software and hardware
Disaggregation of Revenue [Line Items]
Total revenue	15,817	12,222	38,705	32,822
Transferred at Point in Time | Identity verification software and hardware
Disaggregation of Revenue [Line Items]
Total revenue	1,156	990	3,583	3,358
Transferred over Time | Deposits services and other
Disaggregation of Revenue [Line Items]
Total revenue	4,963	4,726	14,887	13,399
Transferred over Time | Identity verification services and other
Disaggregation of Revenue [Line Items]
Total revenue	$ 9,842	$ 7,475	$ 29,351	$ 21,093

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