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Commitments and Contingencies - Narrative (Details) ft² in Thousands, € in Millions |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 13 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) ft² patent | Dec. 04, 2020 patent | Sep. 30, 2020 USD ($) 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 ($) | Jun. 11, 2018 EUR (€) | May 03, 2018 USD ($) | Mar. 31, 2021 USD ($) ft² | Feb. 23, 2021 patent | Mar. 31, 2021 USD ($) ft² | Feb. 01, 2021 patent
Leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining lease term of operating leases | 4 years |  |  |  |  |  |  |  |  |  |  | 4 years |  | 4 years |
Weighted average discount rate of operating leases | 4.60% |  |  |  |  |  |  |  |  |  |  | 4.60% |  | 4.60% |
ROU assets | $ | $ 4,791,000 |  | $ 5,407,000 |  |  |  |  |  |  |  |  | $ 4,791,000 |  | $ 4,791,000 |
ROU liabilities | $ | 6,391,000 |  | 7,100,000 |  |  |  |  |  |  |  |  | 6,391,000 |  | 6,391,000 |
Lease liabilities, current portion | $ | 1,755,000 |  | 1,819,000 |  |  |  |  |  |  |  |  | 1,755,000 |  | 1,755,000 |
Lease liabilities, non-current portion | $ | $ 4,636,000 |  | $ 5,327,000 |  |  |  |  |  |  |  |  | 4,636,000 |  | 4,636,000 |
Operating lease costs | $ |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  | 1,100,000 |
Operating cash flows for operating leases paid | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining operating lease term | 1 year |  |  |  |  |  |  |  |  |  |  | 1 year |  | 1 year |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining operating lease term | 7 years |  |  |  |  |  |  |  |  |  |  | 7 years |  | 7 years |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ |  |  |  |  |  |  |  |  |  |  | $ 10,000,000.0 |  |  |  |
Interest rate floor |  |  |  |  |  |  |  |  |  |  | 4.50% |  |  |  |
Minimum unrestricted cash and unused borrowing capacity | $ |  |  |  |  |  |  |  |  |  |  | $ 15,000,000.0 |  |  |  |
Adjusted quick ratio requirement |  |  |  |  |  |  |  |  |  |  | 1.75 |  |  |  |
Borrowings outstanding | $ | $ 0 |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |
Line of Credit | Revolving Credit Facility | Prime Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |
Building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office space subject to the lease | ft² | 29 |  |  |  |  |  |  |  |  |  |  | 29 |  | 29 |
Pending Litigation | General and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal fees | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |
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. | ICAR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingency amount claimed |  |  |  |  |  |  |  |  | $ 900,000 | € 0.8 |  |  |  |  |
Pending Litigation | USAA | Wells Fargo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patents allegedly infringed |  |  | 2 | 2 | 3 |  | 5 | 4 |  |  |  |  |  |  | 4
Number of patents infringed | patent |  |  |  | 1 | 1 |  |  |  |  |  |  |  |  |  |
Amount awarded in damages to other party | $ |  |  |  | $ 102,000,000 | $ 200,000,000 |  |  |  |  |  |  |  |  |  |
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 | patent |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Number of patents denied institution petition | patent |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  | 1
Pending Litigation | USAA | PNC Bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patents allegedly infringed | patent | 2 | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |
Number of patents denied institution petition | patent | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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