Revenue Recognition - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Jun. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 38,765	$ 39,195	$ 33,510	$ 32,473	$ 33,270	$ 31,778	$ 28,773	$ 25,976	$ 65,982	$ 105,178	$ 143,943	$ 119,797	$ 101,310
Deposits revenue
Disaggregation of Revenue [Line Items]
Revenue											85,808	75,517	67,730
Deposits software and hardware | Transferred at point in time
Disaggregation of Revenue [Line Items]
Revenue											64,161	55,129	49,765
Deposits services and other | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue											21,647	20,388	17,965
Identity verification revenue
Disaggregation of Revenue [Line Items]
Revenue											58,135	44,280	33,580
Identity verification software and hardware | Transferred at point in time
Disaggregation of Revenue [Line Items]
Revenue											8,333	4,940	4,387
Identity verification services and other | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue											$ 49,802	$ 39,340	$ 29,193