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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Recurring [Member] |  |  |
Assets: |  |  |
Cash equivalents |  | $ 114,140 | $ 48,336
Total |  | 212,739 | 134,462
Cash equivalents |  | 114,140 | 48,336
Non-recurring fair value measurements: |  |  |
Cash equivalents |  | 114,140 | 48,336
Fair Value, Recurring [Member] | U.S. treasuries [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 5,549 | 5,251
Financial instruments owned, at fair value |  | 5,549 | 5,251
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 5,549 | 5,251
Fair Value, Recurring [Member] | Equities [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 9,105 | 8,478
Financial instruments owned, at fair value |  | 9,105 | 8,478
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 9,105 | 8,478
Fair Value, Recurring [Member] | Fixed income [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 1,954 | 1,905
Financial instruments owned, at fair value |  | 1,954 | 1,905
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 1,954 | 1,905
Fair Value, Recurring [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Cash equivalents |  | 114,140 | 48,336
Total |  | 198,925 | 120,740
Cash equivalents |  | 114,140 | 48,336
Non-recurring fair value measurements: |  |  |
Cash equivalents |  | 114,140 | 48,336
Fair Value, Recurring [Member] | Level 1 [Member] | U.S. treasuries [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Equities [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 9,105 | 8,478
Financial instruments owned, at fair value |  | 9,105 | 8,478
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 9,105 | 8,478
Fair Value, Recurring [Member] | Level 1 [Member] | Fixed income [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 1,032 | 1,019
Financial instruments owned, at fair value |  | 1,032 | 1,019
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 1,032 | 1,019
Fair Value, Recurring [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Cash equivalents |  |  |
Total |  | 12,964 | 13,035
Cash equivalents |  |  |
Non-recurring fair value measurements: |  |  |
Cash equivalents |  |  |
Fair Value, Recurring [Member] | Level 2 [Member] | U.S. treasuries [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 5,549 | 5,251
Financial instruments owned, at fair value |  | 5,549 | 5,251
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 5,549 | 5,251
Fair Value, Recurring [Member] | Level 2 [Member] | Equities [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Fixed income [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 922 | 886
Financial instruments owned, at fair value |  | 922 | 886
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 922 | 886
Fair Value, Recurring [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Cash equivalents |  |  |
Total |  | 850 | 687
Cash equivalents |  |  |
Non-recurring fair value measurements: |  |  |
Cash equivalents |  |  |
Fair Value, Recurring [Member] | Level 3 [Member] | U.S. treasuries [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Equities [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Level 3 [Member] | Fixed income [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | ETFs [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 74,648 |
Financial instruments owned, at fair value |  | 74,648 |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 74,648 |
Fair Value, Recurring [Member] | ETFs [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 74,648 |
Financial instruments owned, at fair value |  | 74,648 |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 74,648 |
Fair Value, Recurring [Member] | ETFs [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | ETFs [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Pass-through GSEs [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 6,493 | 6,898
Financial instruments owned, at fair value |  | 6,493 | 6,898
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 6,493 | 6,898
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 6,493 | 6,898
Financial instruments owned, at fair value |  | 6,493 | 6,898
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 6,493 | 6,898
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | ETFs [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  | 62,907
Financial instruments owned, at fair value |  |  | 62,907
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  | 62,907
Fair Value, Recurring [Member] | ETFs [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  | 62,907
Financial instruments owned, at fair value |  |  | 62,907
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  | 62,907
Fair Value, Recurring [Member] | ETFs [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | ETFs [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Other Investments [Member] | Fair Value, Recurring [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 850 | 687
Financial instruments owned, at fair value |  | 850 | 687
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 850 | 687
Other Investments [Member] | Fair Value, Recurring [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Other Investments [Member] | Fair Value, Recurring [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Other Investments [Member] | Fair Value, Recurring [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Financial instruments owned, at fair value |  | 850 | 687
Financial instruments owned, at fair value |  | 850 | 687
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | $ 850 | 687
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member] |  |  |
Assets: |  |  |
Fnality International Limited—Series B-1 Preference Shares(1) | [1] |  | 8,288
Fnality International Limited—Series B-1 Preference Shares(1) | [1] |  | 8,288
Non-recurring fair value measurements: |  |  |
Fnality International Limited—Series B-1 Preference Shares(1) | [1] |  | 8,288
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Fnality International Limited—Series B-1 Preference Shares(1) | [1] |  |
Fnality International Limited—Series B-1 Preference Shares(1) | [1] |  |
Non-recurring fair value measurements: |  |  |
Fnality International Limited—Series B-1 Preference Shares(1) | [1] |  |
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Fnality International Limited—Series B-1 Preference Shares(1) | [1] |  |
Fnality International Limited—Series B-1 Preference Shares(1) | [1] |  |
Non-recurring fair value measurements: |  |  |
Fnality International Limited—Series B-1 Preference Shares(1) | [1] |  |
Fnality International Limited—Series B-1 Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Fnality International Limited—Series B-1 Preference Shares(1) | [1] |  | 8,288
Fnality International Limited—Series B-1 Preference Shares(1) | [1] |  | 8,288
Non-recurring fair value measurements: |  |  |
Fnality International Limited—Series B-1 Preference Shares(1) | [1] |  | $ 8,288
[1] | Fair value determined on June 17, 2024. Not included above are prospective changes in value due to fluctuations in the British pound to U.S. dollar exchange rate.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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