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Revenue Recognition - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 33,270	$ 31,778	$ 28,773	$ 25,976	$ 30,638	$ 25,413	$ 23,192	$ 22,067	$ 25,018	$ 21,906	$ 19,983	$ 17,683	$ 119,797	$ 101,310	$ 84,590
Deposits revenue
Disaggregation of Revenue [Line Items]
Revenue													75,517	67,730	57,030
Deposits software and hardware | Transferred at point in time
Disaggregation of Revenue [Line Items]
Revenue													55,129	49,765	41,860
Deposits services and other | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue													20,388	17,965	15,170
Identity verification revenue
Disaggregation of Revenue [Line Items]
Revenue													44,280	33,580	27,560
Identity verification software and hardware | Transferred at point in time
Disaggregation of Revenue [Line Items]
Revenue													4,940	4,387	4,985
Identity verification services and other | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue													$ 39,340	$ 29,193	$ 22,575

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