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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets and liabilities measured on recurring basis (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Securities and other investments owned: |  |
Total securities and other investments owned | $ 140,398 | $ 199,358
Loans receivable, at fair value | 98,596 | 90,103
Total assets measured at fair value | 238,994 | 289,461
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 2,140 | 5,675
Contingent consideration | 4,593 | 4,538
Liability-classified warrants | 5,160 |
Embedded derivative | 14,593 |
Total liabilities measured at fair value | 26,486 | 10,213
Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 80,206 | 150,353
Loans receivable, at fair value | 0 | 0
Total assets measured at fair value | 80,206 | 150,353
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 549 | 0
Contingent consideration | 0 | 0
Liability-classified warrants | 0 |
Embedded derivative | 0 |
Total liabilities measured at fair value | 549 | 0
Other observable inputs (Level 2) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 32,662 | 8,489
Loans receivable, at fair value | 0 | 0
Total assets measured at fair value | 32,662 | 8,489
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,591 | 5,675
Contingent consideration | 0 | 0
Liability-classified warrants | 0 |
Embedded derivative | 0 |
Total liabilities measured at fair value | 1,591 | 5,675
Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 27,530 | 40,516
Loans receivable, at fair value | 98,596 | 90,103
Total assets measured at fair value | 126,126 | 130,619
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Contingent consideration | 4,593 | 4,538
Liability-classified warrants | 5,160 |
Embedded derivative | 14,593 |
Total liabilities measured at fair value | 24,346 | 4,538
Equity securities |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 107,200 | 165,408
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 548 |
Equity securities | Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 79,670 | 124,892
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 548 |
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 | 27,530 | 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 | 30,808 | 29,027
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 840 | 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 | 536 | 25,461
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1 | 0
Corporate bonds | Other observable inputs (Level 2) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 30,272 | 3,566
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 839 | 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 | 2,390 | 4,923
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 752 | 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 | 2,390 | 4,923
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 752 | 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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