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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Measurements [Abstract] |
Schedule of Assets and Liabilities Measured at Fair Value | The tables below summarize the categorization of the Company’s assets and liabilities measured at fair value. During the three and nine months ended September 30, 2025 and 2024, there were no transfers between Levels 2 and 3.
|  | September 30, 2025
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Recurring fair value measurements: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 199,576 |  |  | $ | 199,576 |  |  | $ | — |  |  | $ | — |
Financial instruments owned, at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ETFs |  |  | 79,862 |  |  |  | 79,862 |  |  |  | — |  |  |  | — |
Pass-through GSEs |  |  | 6,205 |  |  |  | — |  |  |  | 6,205 |  |  |  | — |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  |  | 5,510 |  |  |  | — |  |  |  | 5,510 |  |  |  | — |
Equities |  |  | 10,030 |  |  |  | 10,030 |  |  |  | — |  |  |  | — |
Fixed income |  |  | 2,676 |  |  |  | 1,071 |  |  |  | 1,605 |  |  |  | — |
Total |  | $ | 303,859 |  |  | $ | 290,539 |  |  | $ | 13,320 |  |  | $ | — |
Non-recurring fair value measurements: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fnality International Limited—Series B-1 Preference Shares(1) |  | $ | 8,035 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,035 |
| (1) | Fair value determined on September 10, 2025. Not included in the table above are prospective changes in value due to fluctuations in the British pound to U.S. dollar exchange rate.
|  | December 31, 2024
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Recurring fair value measurements: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 48,336 |  |  | $ | 48,336 |  |  | $ | — |  |  | $ | — |
Financial instruments owned, at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ETFs |  |  | 62,907 |  |  |  | 62,907 |  |  |  | — |  |  |  | — |
Pass-through GSEs |  |  | 6,898 |  |  |  | — |  |  |  | 6,898 |  |  |  | — |
Other assets—seed capital (WisdomTree Digital Funds): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  |  | 5,251 |  |  |  | — |  |  |  | 5,251 |  |  |  |  |
Equities |  |  | 8,478 |  |  |  | 8,478 |  |  |  | — |  |  |  | — |
Fixed income |  |  | 1,905 |  |  |  | 1,019 |  |  |  | 886 |  |  |  | — |
Other investments |  |  | 687 |  |  |  | — |  |  |  | — |  |  |  | 687 |
Total |  | $ | 134,462 |  |  | $ | 120,740 |  |  | $ | 13,035 |  |  | $ | 687 |
Non-recurring fair value measurements: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fnality International Limited—Series B-1 Preference Shares(1) |  | $ | 8,288 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,288 |
| (1) | Fair value determined on June 17, 2024. Not included in the table above are prospective changes in value due to fluctuations in the British pound to U.S. dollar exchange rate.
Schedule of Instruments | These instruments consist of the following:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Investments in Convertible Notes (Note 6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 850 |  |  | $ | — |  |  | $ | 687 |  |  | $ | — |
Net unrealized gains(1) |  |  | 121 |  |  |  | — |  |  |  | 284 |  |  |  | — |
Conversion |  |  | (971 | ) |  |  | — |  |  |  | (971 | ) |  |  |  |
Ending balance |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
| (1) | Recorded in other gains and losses, net in the Consolidated Statements of Operations.

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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