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Fair Value Measurements - Schedule of Financial Assets and Liabilities not Measured at Fair Value (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023 | Jul. 10, 2023
--- | --- | --- | ---
Financial assets, not measured at fair value |  |  |
Cash and cash equivalents | $ 32,629,000 | $ 5,735,000 |
Cash – segregated for regulatory purposes | 135,829,000 | 158,802,000 |
Securities borrowed | 139,040,000 | 394,709,000 |
Receivables from customers | 84,367,000 | 72,823,000 |
Receivables from non-customers | 607,000 | 241,000 |
Receivables from broker-dealers and clearing organizations | 3,920,000 | 3,863,000 |
Other receivables | 2,744,000 | 2,424,000 |
Deposits with broker-dealers and clearing organizations | 4,227,000 | 7,885,000 |
Total financial assets, not measured at fair value | 403,363,000 | 646,482,000 |
Financial liabilities, not measured at fair value |  |  |
Securities loaned | 184,962,000 | 419,433,000 |
Payables to customers | 227,129,000 | 289,777,000 |
Payables to non-customers | 3,297,000 | 713,000 |
Drafts payable | 1,331,000 | 1,726,000 |
Payables to broker-dealers and clearing organizations | 444,000 | 481,000 |
Deferred contract incentive | 496,000 | 1,246,000 |
Long-term debt | 4,228,000 | 4,313,000 | $ 2,510,000
Contract termination liability | 2,567,000 | 4,462,000 |
Total financial liabilities, not measured at fair value | 424,454,000 | 722,151,000 |
Level 1 [Member] |  |  |
Financial assets, not measured at fair value |  |  |
Cash and cash equivalents | 32,629,000 | 5,735,000 |
Cash – segregated for regulatory purposes | 135,829,000 | 158,802,000 |
Securities borrowed |  |  |
Receivables from customers |  |  |
Receivables from non-customers |  |  |
Receivables from broker-dealers and clearing organizations |  |  |
Other receivables |  |  |
Deposits with broker-dealers and clearing organizations |  |  |
Total financial assets, not measured at fair value | 168,458,000 | 164,537,000 |
Financial liabilities, not measured at fair value |  |  |
Securities loaned |  |  |
Payables to customers |  |  |
Payables to non-customers |  |  |
Drafts payable |  |  |
Payables to broker-dealers and clearing organizations |  |  |
Deferred contract incentive |  |  |
Long-term debt |  |  |
Contract termination liability |  |  |
Total financial liabilities, not measured at fair value |  |  |
Level 2 [Member] |  |  |
Financial assets, not measured at fair value |  |  |
Cash and cash equivalents |  |  |
Cash – segregated for regulatory purposes |  |  |
Securities borrowed | 139,040,000 | 394,709,000 |
Receivables from customers | 84,367,000 | 72,823,000 |
Receivables from non-customers | 607,000 | 241,000 |
Receivables from broker-dealers and clearing organizations | 3,920,000 | 3,863,000 |
Other receivables | 2,744,000 | 2,424,000 |
Deposits with broker-dealers and clearing organizations | 4,227,000 | 7,885,000 |
Total financial assets, not measured at fair value | 234,905,000 | 481,945,000 |
Financial liabilities, not measured at fair value |  |  |
Securities loaned | 184,962,000 | 419,433,000 |
Payables to customers | 227,129,000 | 289,777,000 |
Payables to non-customers | 3,297,000 | 713,000 |
Drafts payable | 1,331,000 | 1,726,000 |
Payables to broker-dealers and clearing organizations | 444,000 | 481,000 |
Deferred contract incentive | 496,000 | 1,246,000 |
Long-term debt | 4,228,000 | 4,313,000 |
Contract termination liability | 2,567,000 | 4,462,000 |
Total financial liabilities, not measured at fair value | 424,454,000 | 722,151,000 |
Level 3 [Member] |  |  |
Financial assets, not measured at fair value |  |  |
Cash and cash equivalents |  |  |
Cash – segregated for regulatory purposes |  |  |
Securities borrowed |  |  |
Receivables from customers |  |  |
Receivables from non-customers |  |  |
Receivables from broker-dealers and clearing organizations |  |  |
Other receivables |  |  |
Deposits with broker-dealers and clearing organizations |  |  |
Total financial assets, not measured at fair value |  |  |
Financial liabilities, not measured at fair value |  |  |
Securities loaned |  |  |
Payables to customers |  |  |
Payables to non-customers |  |  |
Drafts payable |  |  |
Payables to broker-dealers and clearing organizations |  |  |
Deferred contract incentive |  |  |
Long-term debt |  |  |
Contract termination liability |  |  |
Total financial liabilities, not measured at fair value |  |  |
Fair Value [Member] |  |  |
Financial assets, not measured at fair value |  |  |
Cash and cash equivalents | 32,629,000 | 5,735,000 |
Cash – segregated for regulatory purposes | 135,829,000 | 158,802,000 |
Securities borrowed | 139,040,000 | 394,709,000 |
Receivables from customers | 84,367,000 | 72,823,000 |
Receivables from non-customers | 607,000 | 241,000 |
Receivables from broker-dealers and clearing organizations | 3,920,000 | 3,863,000 |
Other receivables | 2,744,000 | 2,424,000 |
Deposits with broker-dealers and clearing organizations | 4,227,000 | 7,885,000 |
Total financial assets, not measured at fair value | 403,363,000 | 646,482,000 |
Financial liabilities, not measured at fair value |  |  |
Securities loaned | 184,962,000 | 419,433,000 |
Payables to customers | 227,129,000 | 289,777,000 |
Payables to non-customers | 3,297,000 | 713,000 |
Drafts payable | 1,331,000 | 1,726,000 |
Payables to broker-dealers and clearing organizations | 444,000 | 481,000 |
Deferred contract incentive | 496,000 | 1,246,000 |
Long-term debt | 4,228,000 | 4,313,000 |
Contract termination liability | 2,567,000 | 4,462,000 |
Total financial liabilities, not measured at fair value | $ 424,454,000 | $ 722,151,000 |

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