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Fair Value Measurements (Details) - Schedule of Assets and Liabilities Measured at Fair Value - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Level 1 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Level 3 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] |  |  |
Recurring fair value measurements: |  |  |
Cash equivalents |  | $ 13,795 | 50,226
Financial instruments owned, at fair value: |  |  |
Total |  | 72,096 | 108,948
Fair Value, Recurring [Member] | Level 1 [Member] |  |  |
Recurring fair value measurements: |  |  |
Cash equivalents |  | 13,795 | 50,226
Financial instruments owned, at fair value: |  |  |
Total |  | 55,962 | 92,752
Fair Value, Recurring [Member] | Level 2 [Member] |  |  |
Recurring fair value measurements: |  |  |
Cash equivalents |  |  |
Financial instruments owned, at fair value: |  |  |
Total |  | 16,134 | 16,196
Fair Value, Recurring [Member] | Level 3 [Member] |  |  |
Recurring fair value measurements: |  |  |
Cash equivalents |  |  |
Financial instruments owned, at fair value: |  |  |
Total |  |  |
Fair Value, Recurring [Member] | U.S. treasuries [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 5,261 | 5,007
Fair Value, Recurring [Member] | U.S. treasuries [Member] | Level 1 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | U.S. treasuries [Member] | Level 2 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 5,261 | 5,007
Fair Value, Recurring [Member] | U.S. treasuries [Member] | Level 3 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Equity Securities [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 7,095 | 6,337
Fair Value, Recurring [Member] | Equity Securities [Member] | Level 1 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 7,095 | 6,337
Fair Value, Recurring [Member] | Equity Securities [Member] | Level 2 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Equity Securities [Member] | Level 3 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Fixed Income Investments [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 1,939 | 1,957
Fair Value, Recurring [Member] | Fixed Income Investments [Member] | Level 1 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 1,014 | 1,008
Fair Value, Recurring [Member] | Fixed Income Investments [Member] | Level 2 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 925 | 949
Fair Value, Recurring [Member] | Fixed Income Investments [Member] | Level 3 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | ETFs [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 34,058 | 35,181
Fair Value, Recurring [Member] | ETFs [Member] | Level 1 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 34,058 | 35,181
Fair Value, Recurring [Member] | ETFs [Member] | Level 2 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | ETFs [Member] | Level 3 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Pass-through GSEs [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 9,948 | 10,240
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 1 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 2 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  | 9,948 | 10,240
Fair Value, Recurring [Member] | Pass-through GSEs [Member] | Level 3 [Member] |  |  |
Financial instruments owned, at fair value: |  |  |
Financial instruments owned, at fair value |  |  |
Fair Value, Nonrecurring [Member] |  |  |
Non-recurring fair value measurements: |  |  |
Non-recurring fair value measurements |  |  | 9,684
Fair Value, Nonrecurring [Member] | Level 1 [Member] |  |  |
Non-recurring fair value measurements: |  |  |
Non-recurring fair value measurements |  |  |
Fair Value, Nonrecurring [Member] | Level 2 [Member] |  |  |
Non-recurring fair value measurements: |  |  |
Non-recurring fair value measurements |  |  |
Fair Value, Nonrecurring [Member] | Level 3 [Member] |  |  |
Non-recurring fair value measurements: |  |  |
Non-recurring fair value measurements |  |  | 9,684
Fnality International Limited—B-One Preference Shares [Member] | Fair Value, Nonrecurring [Member] |  |  |
Non-recurring fair value measurements: |  |  |
Non-recurring fair value measurements | [1] |  | 9,684
Fnality International Limited—B-One Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 1 [Member] |  |  |
Non-recurring fair value measurements: |  |  |
Non-recurring fair value measurements | [1] |  |
Fnality International Limited—B-One Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 2 [Member] |  |  |
Non-recurring fair value measurements: |  |  |
Non-recurring fair value measurements | [1] |  |
Fnality International Limited—B-One Preference Shares [Member] | Fair Value, Nonrecurring [Member] | Level 3 [Member] |  |  |
Non-recurring fair value measurements: |  |  |
Non-recurring fair value measurements | [1] |  | 9,684
Other Investments [Member] | Fair Value, Nonrecurring [Member] |  |  |
Non-recurring fair value measurements: |  |  |
Non-recurring fair value measurements | [2] |  |
Other Investments [Member] | Fair Value, Nonrecurring [Member] | Level 1 [Member] |  |  |
Non-recurring fair value measurements: |  |  |
Non-recurring fair value measurements | [2] |  |
Other Investments [Member] | Fair Value, Nonrecurring [Member] | Level 2 [Member] |  |  |
Non-recurring fair value measurements: |  |  |
Non-recurring fair value measurements | [2] |  |
Other Investments [Member] | Fair Value, Nonrecurring [Member] | Level 3 [Member] |  |  |
Non-recurring fair value measurements: |  |  |
Non-recurring fair value measurements | [2] |  |
[1] | Fair value determined on October 31, 2023
[2] | Fair value determined on September 30, 2023

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