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Commitments and Contingencies - Narrative (Details) ft² in Thousands, $ in Thousands, € in Millions																	1 Months Ended		2 Months Ended	3 Months Ended			6 Months Ended
	Apr. 15, 2022 USD ($)	Dec. 13, 2021 USD ($)	Aug. 27, 2021 petition	Jul. 21, 2021 petition	Mar. 31, 2021 patent	Dec. 04, 2020 patent	Nov. 17, 2020 petition	Sep. 30, 2020 patent	Jan. 10, 2020 USD ($) product patent	Nov. 06, 2019 USD ($) patent	Jul. 31, 2019 patent	Aug. 17, 2018 patent	Jul. 07, 2018 patent	Jul. 07, 2018 petition	Jun. 11, 2018 USD ($)	Jun. 11, 2018 EUR (€)	Mar. 31, 2021 petition	Sep. 30, 2020 petition patent	Nov. 30, 2021 patent petition	Mar. 31, 2022 USD ($) ft²	Mar. 31, 2021 USD ($)	Feb. 23, 2021 petition	Mar. 31, 2022 USD ($) ft²	Mar. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 19, 2020 USD ($)
Leases
Weighted average remaining lease term of operating leases (in years)																				5 years 2 months 12 days			5 years 2 months 12 days
Weighted average discount rate of operating leases																				3.20%			3.20%
ROU assets																				$ 6,098			$ 6,098		$ 7,056
ROU liabilities																				7,429			7,429		8,500
Lease liabilities, current portion																				1,944			1,944		1,943
Lease liabilities, non-current portion																				5,485			5,485		$ 6,588
Operating lease costs																				$ 500	$ 500		1,100	$ 1,100
Operating cash flows for operating leases paid																							$ 1,000
Maplebear, Inc., d/b/a Instacart | Subscription to Mobile Verify Advance Service
Legal Proceedings
Annual commitment amount																										$ 1,200
Minimum
Leases
Remaining operating lease term (in years)																				1 year			1 year
Maximum
Leases
Remaining operating lease term (in years)																				8 years			8 years
Building
Leases
Office space subject to the lease (in square feet) | ft²																				29			29
Pending Litigation | General and administrative
Legal Proceedings
Legal fees																							$ 700
Pending Litigation | UrbanFT
Legal Proceedings
Number of patents allegedly infringed | patent											5
Number of patents infringed | patent											2
Number of invalid patents | patent											2
Number of patents not infringed | patent											2
Pending Litigation | Global Equity & Corporate Consulting, S.L. | HooYu
Legal Proceedings
Contingency amount claimed															$ 900	€ 0.8
Pending Litigation | USAA | Wells Fargo
Legal Proceedings
Number of patents allegedly infringed									2	3		5	4	4				2
Number of patents infringed | patent									1	1
Amount awarded in damages to other party									$ 102,000	$ 200,000
Number of patents dropped | patent												2
Number of invalid patents | patent												1
Number of products accused of patent infringement | product									0
Number of patents instituted | petition														3
Number of patents denied institution petition | petition							4							1								4
Pending Litigation | USAA | PNC Bank
Legal Proceedings
Number of patents allegedly infringed | patent					2	2		2										2
Number of invalid patents | patent																			1
Number of patents denied institution petition | petition			2	6													2		4
Pending Litigation | UrbanFT | Subsequent Event
Legal Proceedings
Compensatory damages awarded	$ 1,700
Pending Litigation | Maplebear, Inc., d/b/a Instacart
Legal Proceedings
Contingency amount claimed		$ 2,000

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