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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of securities and other investments owned and securities sold not yet purchased at fair value (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Securities and other investments owned at fair value:    
Total securities and other investments owned at fair value: [1] $ 161,543 $ 215,225
Equity securities valued under the measurement alternative 70,217 67,100
Total securities and other investments owned [1] 231,760 282,325
Securities sold not yet purchased:    
Total securities sold not yet purchased 2,140 5,675
Corporate bonds    
Securities and other investments owned at fair value:    
Total securities and other investments owned at fair value: 30,808 29,027
Securities sold not yet purchased:    
Total securities sold not yet purchased 840 1,891
Other fixed income securities    
Securities and other investments owned at fair value:    
Total securities and other investments owned at fair value: 2,390 4,923
Securities sold not yet purchased:    
Total securities sold not yet purchased 752 3,784
Partnership interests and other    
Securities and other investments owned at fair value:    
Total securities and other investments owned at fair value: 21,145 15,867
Equity securities    
Securities and other investments owned at fair value:    
Total securities and other investments owned at fair value: 107,200 165,408
Securities sold not yet purchased:    
Total securities sold not yet purchased $ 548 $ 0
[1] At March 31, 2025, the balance sheet includes cash of $744, securities and other investments owned, at fair value of $577, loans receivable, at fair value of $3,575, prepaid and other expenses of $3,824, accrued expenses and other liabilities of $528 and noncontrolling interest of $7,099 of consolidated variable interest entities (Note 2(o)).