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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets and liabilities measured on recurring basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Securities and other investments owned:    
Total securities and other investments owned $ 150,066 $ 199,358
Loans receivable, at fair value 48,980 90,103
Other assets 1,029  
Total assets measured at fair value 200,075 289,461
Securities sold not yet purchased:    
Total securities sold not yet purchased 12,347 5,675
Contingent consideration 4,608 4,538
Total liabilities measured at fair value 21,115 10,213
Oaktree Warrants | Warrant    
Securities sold not yet purchased:    
Liability-classified warrants 4,160  
Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Total securities and other investments owned 89,054 150,353
Loans receivable, at fair value 0 0
Other assets 0  
Total assets measured at fair value 89,054 150,353
Securities sold not yet purchased:    
Total securities sold not yet purchased 10,411 0
Contingent consideration 0 0
Total liabilities measured at fair value 10,411 0
Quoted prices in active markets for identical assets (Level 1) | Oaktree Warrants | Warrant    
Securities sold not yet purchased:    
Liability-classified warrants 0  
Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 33,286 8,489
Loans receivable, at fair value 0 0
Other assets 0  
Total assets measured at fair value 33,286 8,489
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,936 5,675
Contingent consideration 0 0
Total liabilities measured at fair value 1,936 5,675
Other observable inputs (Level 2) | Oaktree Warrants | Warrant    
Securities sold not yet purchased:    
Liability-classified warrants 0  
Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Total securities and other investments owned 27,726 40,516
Loans receivable, at fair value 48,980 90,103
Other assets 1,029  
Total assets measured at fair value 77,735 130,619
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Contingent consideration 4,608 4,538
Total liabilities measured at fair value 8,768 4,538
Significant unobservable inputs (Level 3) | Oaktree Warrants | Warrant    
Securities sold not yet purchased:    
Liability-classified warrants 4,160  
Equity securities    
Securities and other investments owned:    
Total securities and other investments owned 116,655 165,408
Securities sold not yet purchased:    
Total securities sold not yet purchased 10,411  
Equity securities | Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Total securities and other investments owned 88,929 124,892
Securities sold not yet purchased:    
Total securities sold not yet purchased 10,411  
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 27,726 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 33,252 29,027
Securities sold not yet purchased:    
Total securities sold not yet purchased 420 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 125 25,461
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 33,127 3,566
Securities sold not yet purchased:    
Total securities sold not yet purchased 420 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 159 4,923
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,516 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 159 4,923
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,516 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