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Revenue Recognition - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 28,773	$ 23,192	$ 54,748	$ 45,259
Deposits revenue
Disaggregation of Revenue [Line Items]
Total revenue	17,197	14,622	32,812	29,273
Identity verification revenue
Disaggregation of Revenue [Line Items]
Total revenue	11,576	8,570	21,936	15,986
Transferred at Point in Time | Deposits software and hardware
Disaggregation of Revenue [Line Items]
Total revenue	12,134	10,317	22,888	20,600
Transferred at Point in Time | Identity verification software and hardware
Disaggregation of Revenue [Line Items]
Total revenue	879	1,136	2,427	2,368
Transferred over Time | Deposits services and other
Disaggregation of Revenue [Line Items]
Total revenue	5,063	4,305	9,924	8,673
Transferred over Time | Identity verification services and other
Disaggregation of Revenue [Line Items]
Total revenue	$ 10,697	$ 7,434	$ 19,509	$ 13,618

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