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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