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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets and liabilities measured on recurring basis (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Securities and other investments owned: |  |
Total securities and other investments owned | $ 259,796 | $ 709,398
Loans receivable, at fair value | 151,704 | 532,419
Total assets measured at fair value | 411,500 | 1,241,817
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 2,450 | 8,601
Contingent consideration | 23,702 | 27,986
Contingent consideration |  | 27,985
Total liabilities measured at fair value | 26,152 | 36,586
Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 189,005 | 250,586
Loans receivable, at fair value | 0 | 0
Total assets measured at fair value | 189,005 | 250,586
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 634 | 1,037
Contingent consideration | 0 |
Contingent consideration |  | 0
Total liabilities measured at fair value | 634 | 1,037
Other observable inputs (Level 2) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 8,843 | 6,231
Loans receivable, at fair value | 0 | 0
Total assets measured at fair value | 8,843 | 6,231
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,816 | 7,564
Contingent consideration | 0 |
Contingent consideration |  | 0
Total liabilities measured at fair value | 1,816 | 7,564
Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 61,948 | 452,581
Loans receivable, at fair value | 151,704 | 532,419
Total assets measured at fair value | 213,652 | 985,000
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Contingent consideration | 23,702 |
Contingent consideration |  | 27,985
Total liabilities measured at fair value | 23,702 | 27,985
Equity securities |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 223,543 | 647,122
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 634 | 1,037
Equity securities | Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 161,595 | 194,541
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 634 | 1,037
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 | 0
Equity securities | Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 61,948 | 452,581
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Corporate bonds |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 31,496 | 59,287
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 509 | 5,971
Corporate bonds | Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 27,410 | 56,045
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 | 4,086 | 3,242
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 509 | 5,971
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 | 4,757 | 2,989
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,307 | 1,593
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 | 4,757 | 2,989
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,307 | 1,593
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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