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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of securities and other investments owned and securities sold not yet purchased at fair value (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Securities and other investments owned at fair value: |  |  |
Total securities and other investments owned |  | $ 172,135 | $ 215,225
Securities and other investments owned, carrying value |  | 70,217 | 67,100
Total securities and other investments owned | [1] | 242,352 | 282,325
Securities sold not yet purchased: |  |  |
Total securities sold not yet purchased |  | 12,347 | 5,675
Corporate bonds |  |  |
Securities and other investments owned at fair value: |  |  |
Total securities and other investments owned |  | 33,252 | 29,027
Securities sold not yet purchased: |  |  |
Total securities sold not yet purchased |  | 420 | 1,891
Other fixed income securities |  |  |
Securities and other investments owned at fair value: |  |  |
Total securities and other investments owned |  | 159 | 4,923
Securities sold not yet purchased: |  |  |
Total securities sold not yet purchased |  | 1,516 | 3,784
Partnership interests and other |  |  |
Securities and other investments owned at fair value: |  |  |
Total securities and other investments owned |  | 22,069 | 15,867
Equity securities |  |  |
Securities and other investments owned at fair value: |  |  |
Total securities and other investments owned |  | 116,655 | 165,408
Securities sold not yet purchased: |  |  |
Total securities sold not yet purchased |  | $ 10,411 | $ 0
[1] | At June 30, 2025, the balance sheet includes cash of $365, securities and other investments owned, at fair value of $503, prepaid and other expenses of $3,800, accrued expenses and other liabilities of $253 and noncontrolling interest of $3,826 of consolidated variable interest entities (Note 2 (o)).

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI) and investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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- Definition Fair value of financial instruments held by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479035/940-320-45-2 + Details
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- Definition Fair value of financial instruments sold short by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479035/940-320-45-2 + Details
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