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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets and liabilities measured on recurring basis (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Securities and other investments owned: |  |
Total securities and other investments owned | $ 199,358 | $ 709,398
Loans receivable, at fair value | 90,103 | 532,419
Total assets measured at fair value | 289,461 | 1,241,817
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 5,675 | 8,601
Contingent consideration | 7,630 |
Contingent consideration |  | 27,985
Total liabilities measured at fair value | 13,305 | 36,586
Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 150,353 | 250,586
Loans receivable, at fair value | 0 | 0
Total assets measured at fair value | 150,353 | 250,586
Securities sold not yet purchased: |  |
Total securities sold not yet purchased |  | 1,037
Contingent consideration | 0 |
Contingent consideration |  | 0
Total liabilities measured at fair value | 0 | 1,037
Other observable inputs (Level 2) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 8,489 | 6,231
Loans receivable, at fair value | 0 | 0
Total assets measured at fair value | 8,489 | 6,231
Securities sold not yet purchased: |  |
Total securities sold not yet purchased |  | 7,564
Contingent consideration | 0 |
Contingent consideration |  | 0
Total liabilities measured at fair value | 5,675 | 7,564
Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 40,516 | 452,581
Loans receivable, at fair value | 90,103 | 532,419
Total assets measured at fair value | 130,619 | 985,000
Securities sold not yet purchased: |  |
Total securities sold not yet purchased |  | 0
Contingent consideration | 7,630 |
Contingent consideration |  | 27,985
Total liabilities measured at fair value | 7,630 | 27,985
Equity securities |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 165,408 | 647,122
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,891 | 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 | 124,892 | 194,541
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 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 | 1,891 | 0
Equity securities | Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 40,516 | 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 | 29,027 | 59,287
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 3,784 | 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 | 25,461 | 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 | 3,566 | 3,242
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 3,784 | 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 | 4,923 | 2,989
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 5,675 | 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 | 4,923 | 2,989
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 5,675 | 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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