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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
Jun. 30, 2025
Dec. 31, 2024
Securities and other investments owned at fair value:    
Total securities and other investments owned $ 172,135 $ 215,225
Securities and other investments owned, carrying value 70,217 67,100
Total securities and other investments owned [1] 242,352 282,325
Securities sold not yet purchased:    
Total securities sold not yet purchased 12,347 5,675
Corporate bonds    
Securities and other investments owned at fair value:    
Total securities and other investments owned 33,252 29,027
Securities sold not yet purchased:    
Total securities sold not yet purchased 420 1,891
Other fixed income securities    
Securities and other investments owned at fair value:    
Total securities and other investments owned 159 4,923
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,516 3,784
Partnership interests and other    
Securities and other investments owned at fair value:    
Total securities and other investments owned 22,069 15,867
Equity securities    
Securities and other investments owned at fair value:    
Total securities and other investments owned 116,655 165,408
Securities sold not yet purchased:    
Total securities sold not yet purchased $ 10,411 $ 0
[1] At June 30, 2025, the balance sheet includes cash of $365, securities and other investments owned, at fair value of $503, prepaid and other expenses of $3,800, accrued expenses and other liabilities of $253 and noncontrolling interest of $3,826 of consolidated variable interest entities (Note 2 (o)).