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FAIR VALUE MEASUREMENTS - Schedule of financial assets and liabilities measured on recurring basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Securities and other investments owned:    
Total securities and other investments owned $ 573,477 $ 380,628
Loans receivable, at fair value 24,927 26,303
Total assets measured at fair value 598,404 406,931
Securities sold not yet purchased:    
Total securities sold not yet purchased 16,833 9,809
Liability-classified warrants 11,080  
Contingent consideration   6,400
Total liabilities measured at fair value 27,913 16,209
Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Total securities and other investments owned 456,727 236,156
Loans receivable, at fair value 0 0
Total assets measured at fair value 456,727 236,156
Securities sold not yet purchased:    
Total securities sold not yet purchased 16,148 9,342
Liability-classified warrants 0  
Contingent consideration   0
Total liabilities measured at fair value 16,148 9,342
Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 33,645 33,167
Loans receivable, at fair value 0 0
Total assets measured at fair value 33,645 33,167
Securities sold not yet purchased:    
Total securities sold not yet purchased 685 467
Liability-classified warrants 0  
Contingent consideration   0
Total liabilities measured at fair value 685 467
Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Total securities and other investments owned 83,105 111,305
Loans receivable, at fair value 24,927 26,303
Total assets measured at fair value 108,032 137,608
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Liability-classified warrants 11,080  
Contingent consideration   6,400
Total liabilities measured at fair value 11,080 6,400
Equity securities    
Securities and other investments owned:    
Total securities and other investments owned 485,612 304,422
Securities sold not yet purchased:    
Total securities sold not yet purchased 14,154 9,342
Equity securities | Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Total securities and other investments owned 455,157 233,199
Securities sold not yet purchased:    
Total securities sold not yet purchased 14,154 9,342
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 30,455 71,223
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Partnership interests and other investments    
Securities and other investments owned:    
Total securities and other investments owned 52,650 40,082
Partnership interests and other investments | Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Total securities and other investments owned 0 0
Partnership interests and other investments | Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 0 0
Partnership interests and other investments | Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Total securities and other investments owned 52,650 40,082
Corporate bonds    
Securities and other investments owned:    
Total securities and other investments owned 33,134 31,751
Securities sold not yet purchased:    
Total securities sold not yet purchased 639 467
Corporate bonds | 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
Corporate bonds | Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 33,134 31,751
Securities sold not yet purchased:    
Total securities sold not yet purchased 639 467
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 2,081 4,373
Securities sold not yet purchased:    
Total securities sold not yet purchased 2,040 0
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 1,570 2,957
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,994 0
Other fixed income securities | Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 511 1,416
Securities sold not yet purchased:    
Total securities sold not yet purchased 46 0
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