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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets and liabilities measured on recurring basis (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Securities and other investments owned: |  |
Total securities and other investments owned | $ 150,066 | $ 199,358
Loans receivable, at fair value | 48,980 | 90,103
Other assets | 1,029 |
Total assets measured at fair value | 200,075 | 289,461
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 12,347 | 5,675
Contingent consideration | 4,608 | 4,538
Total liabilities measured at fair value | 21,115 | 10,213
Oaktree Warrants | Warrant |  |
Securities sold not yet purchased: |  |
Liability-classified warrants | 4,160 |
Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 89,054 | 150,353
Loans receivable, at fair value | 0 | 0
Other assets | 0 |
Total assets measured at fair value | 89,054 | 150,353
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 10,411 | 0
Contingent consideration | 0 | 0
Total liabilities measured at fair value | 10,411 | 0
Quoted prices in active markets for identical assets (Level 1) | Oaktree Warrants | Warrant |  |
Securities sold not yet purchased: |  |
Liability-classified warrants | 0 |
Other observable inputs (Level 2) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 33,286 | 8,489
Loans receivable, at fair value | 0 | 0
Other assets | 0 |
Total assets measured at fair value | 33,286 | 8,489
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,936 | 5,675
Contingent consideration | 0 | 0
Total liabilities measured at fair value | 1,936 | 5,675
Other observable inputs (Level 2) | Oaktree Warrants | Warrant |  |
Securities sold not yet purchased: |  |
Liability-classified warrants | 0 |
Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 27,726 | 40,516
Loans receivable, at fair value | 48,980 | 90,103
Other assets | 1,029 |
Total assets measured at fair value | 77,735 | 130,619
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Contingent consideration | 4,608 | 4,538
Total liabilities measured at fair value | 8,768 | 4,538
Significant unobservable inputs (Level 3) | Oaktree Warrants | Warrant |  |
Securities sold not yet purchased: |  |
Liability-classified warrants | 4,160 |
Equity securities |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 116,655 | 165,408
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 10,411 |
Equity securities | Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 88,929 | 124,892
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 10,411 |
Equity securities | Other observable inputs (Level 2) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 0 | 0
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 |
Equity securities | Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 27,726 | 40,516
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 |
Corporate bonds |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 33,252 | 29,027
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 420 | 1,891
Corporate bonds | Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 125 | 25,461
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Corporate bonds | Other observable inputs (Level 2) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 33,127 | 3,566
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 420 | 1,891
Corporate bonds | Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 0 | 0
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Other fixed income securities |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 159 | 4,923
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,516 | 3,784
Other fixed income securities | Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 0 | 0
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Other fixed income securities | Other observable inputs (Level 2) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 159 | 4,923
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,516 | 3,784
Other fixed income securities | Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 0 | 0
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | $ 0 | $ 0

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