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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value Measurements [Abstract] |
Schedule of Financial Assets and Liabilities Measured at Fair Value | The tables below present, by level within the fair value hierarchy, financial assets and liabilities measured at fair value on a recurring basis for the periods indicated. As required by ASC Topic 820, financial assets and financial liabilities are classified in their entirety based on the lowest level of input that is significant to the respective fair value measurement.
|  | As of December 31, 2023 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Cash and securities segregated for regulatory purposes |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 115,515,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 115,515,000 |
Securities owned, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 17,636,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,636,000 |
Certificates of deposit |  |  | — |  |  |  | 114,000 |  |  |  | — |  |  |  | 114,000 |
Corporate bonds |  |  | — |  |  |  | 3,000 |  |  |  | — |  |  |  | 3,000 |
Options |  |  | 2,000 |  |  |  | — |  |  |  | — |  |  |  | 2,000 |
Equity securities |  |  | 146,000 |  |  |  | 137,000 |  |  |  | — |  |  |  | 283,000 |
Total Securities owned, at fair value |  | $ | 17,784,000 |  |  | $ | 254,000 |  |  | $ | — |  |  | $ | 18,038,000 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities sold, not yet purchased, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 2,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,000 |
Total Securities sold, not yet purchased, at fair value |  | $ | 2,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,000 |
|  | As of December 31, 2022 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Cash and securities segregated for regulatory purposes |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 140,978,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 140,978,000 |
Securities owned, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 2,808,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,808,000 |
Certificates of deposit |  |  | — |  |  |  | 92,000 |  |  |  | — |  |  |  | 92,000 |
Municipal securities |  |  | — |  |  |  | 52,000 |  |  |  | — |  |  |  | 52,000 |
Corporate bonds |  |  | — |  |  |  | 7,000 |  |  |  | — |  |  |  | 7,000 |
Equity securities |  |  | 63,000 |  |  |  | 182,000 |  |  |  | — |  |  |  | 245,000 |
Total Securities owned, at fair value |  | $ | 2,871,000 |  |  | $ | 333,000 |  |  | $ | — |  |  | $ | 3,204,000 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities sold, not yet purchased, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 2,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,000 |
Total Securities sold, not yet purchased, at fair value |  | $ | 2,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,000 |
Schedule of U.S. Government Securities Market Values and Maturity Dates | The Company had U.S. government securities, certificates of deposit, municipal securities, and corporate bonds with the market values and maturity dates for the periods indicated below:
|  | As of December 31, 2023 |
Maturing in 2023 |  | $ | 30,000,000 |
Maturing in 2024 |  |  | 98,931,000 |
Maturing in 2025 |  |  | 3,965,000 |
Maturing after 2025 |  |  | 115,000 |
Accrued interest |  |  | 257,000 |
Total Market value |  | $ | 133,268,000 |
|  | As of December 31, 2022 |
Maturing in 2023 |  | $ | 106,873,000 |
Maturing in 2024 |  |  | 36,506,000 |
Maturing after 2024 |  |  | 150,000 |
Accrued interest |  |  | 409,000 |
Total Market value |  | $ | 143,938,000 |
Schedule of Estimated Fair Values | The estimated fair values for these amounts were determined using significant unobservable inputs (Level 3).
|  | As of December 31 |
|  | 2023 |  |  | 2022 |
Equity method investment in related party |  | $ | — |  |  | $ | 2,584,000 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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