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Commitments and Contingencies - Narrative (Details) ft² in Thousands, $ in Thousands, € in Millions															2 Months Ended		3 Months Ended
	Dec. 13, 2021 USD ($)	Aug. 27, 2021 patent	Jul. 14, 2021 patent	Mar. 31, 2021 patent	Dec. 04, 2020 patent	Nov. 17, 2020 patent	Sep. 30, 2020 patent	Jan. 10, 2020 USD ($) product patent	Nov. 06, 2019 USD ($) patent day	Jul. 31, 2019 patent	Aug. 17, 2018 patent	Jul. 07, 2018 patent	Jun. 11, 2018 USD ($)	Jun. 11, 2018 EUR (€)	Dec. 31, 2021 USD ($) ft² patent	Jan. 26, 2021 patent	Dec. 31, 2021 USD ($) ft²	Feb. 23, 2021 patent	Dec. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)	Jun. 19, 2020 USD ($)
Leases
Weighted average remaining lease term of operating leases															5 years 3 months 18 days		5 years 3 months 18 days
Weighted average discount rate of operating leases															3.20%		3.20%
ROU assets | $															$ 6,564		$ 6,564			$ 7,056
ROU liabilities | $															7,974		7,974			8,500
Lease liabilities, current portion | $															1,970		1,970			1,943
Lease liabilities, non-current portion | $															$ 6,004		6,004			$ 6,588
Operating lease costs | $																	600		$ 500
Operating cash flows for operating leases paid | $																	$ 600
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															1 year		1 year
Maximum
Leases
Remaining operating lease term															8 years		8 years
Building
Leases
Office space subject to the lease | ft²															29		29
Pending Litigation | General and administrative
Legal Proceedings
Legal fees | $																	$ 400
Pending Litigation | UrbanFT
Legal Proceedings
Number of patents allegedly infringed										5
Number of patents infringed										2
Number of invalid patents										2
Number of patents not infringed										2
Pending Litigation | Global Equity & Corporate Consulting, S.L. | ICAR
Legal Proceedings
Contingency amount claimed													$ 900	€ 0.8
Pending Litigation | USAA | Wells Fargo
Legal Proceedings
Number of patents allegedly infringed							2	2	3		5	4				4
Number of patents infringed								1	1
Amount awarded in damages to other party | $								$ 102,000	$ 200,000
Number of patents dropped											2
Number of invalid patents											1
Number of products accused of patent infringement | product								0
Number of patents instituted																3
Number of patents denied institution petition						4										1		4
Pending Litigation | USAA | PNC Bank
Legal Proceedings
Number of patents allegedly infringed				2	2		2
Number of invalid patents															1
Number of patents denied institution petition		2	6	2											4
Pending Litigation | Maplebear, Inc., d/b/a Instacart
Legal Proceedings
Contingency amount claimed | $	$ 2,000

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