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FAIR VALUE MEASUREMENTS - Schedule of financial assets and liabilities measured on recurring basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Securities and other investments owned:    
Total securities and other investments owned $ 657,811 $ 380,628
Loans receivable, at fair value 38,802 26,303
Total assets measured at fair value 696,613 406,931
Securities sold not yet purchased:    
Total securities sold not yet purchased 9,487 9,809
Liability-classified warrants   6,400
Embedded derivatives, included in accrued expenses and other liabilities 797  
Total liabilities measured at fair value 10,284 16,209
Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Total securities and other investments owned 437,093 236,156
Loans receivable, at fair value 0 0
Total assets measured at fair value 437,093 236,156
Securities sold not yet purchased:    
Total securities sold not yet purchased 8,593 9,342
Liability-classified warrants   0
Embedded derivatives, included in accrued expenses and other liabilities 0  
Total liabilities measured at fair value 8,593 9,342
Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 28,644 33,167
Loans receivable, at fair value 0 0
Total assets measured at fair value 28,644 33,167
Securities sold not yet purchased:    
Total securities sold not yet purchased 894 467
Liability-classified warrants   0
Embedded derivatives, included in accrued expenses and other liabilities 0  
Total liabilities measured at fair value 894 467
Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Total securities and other investments owned 192,074 111,305
Loans receivable, at fair value 38,802 26,303
Total assets measured at fair value 230,876 137,608
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Liability-classified warrants   6,400
Embedded derivatives, included in accrued expenses and other liabilities 797  
Total liabilities measured at fair value 797 6,400
Equity securities    
Securities and other investments owned:    
Total securities and other investments owned 541,444 304,422
Securities sold not yet purchased:    
Total securities sold not yet purchased 8,894 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 432,120 233,199
Securities sold not yet purchased:    
Total securities sold not yet purchased 8,593 9,342
Equity securities | Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 276 0
Securities sold not yet purchased:    
Total securities sold not yet purchased 301 0
Equity securities | Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Total securities and other investments owned 109,048 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 83,026 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 83,026 40,082
Corporate bonds    
Securities and other investments owned:    
Total securities and other investments owned 28,166 31,751
Securities sold not yet purchased:    
Total securities sold not yet purchased 593 467
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 28,166 31,751
Securities sold not yet purchased:    
Total securities sold not yet purchased 593 467
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 5,175 4,373
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 4,973 2,957
Other fixed income securities | Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 202 1,416
Other fixed income securities | Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Total securities and other investments owned $ 0 $ 0