v3.26.3
Financial Instruments and Other Inventory Positions - Schedule of Financial Instruments and Other Inventory Positions by Type (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Financial instruments and other inventory positions owned    
Convertible securities $ 128,934 $ 140,306
Equity securities 492 0
Fixed income securities 2,783 2,831
Taxable securities 26,238 33,021
Tax-exempt securities 139,263 125,419
Short-term securities 88,973 19,531
Asset-backed securities 60,981 92,472
U.S. government agency securities 51,928 82,666
U.S. government securities 7,705 201
Derivative contracts 3,401 5,823
Total financial instruments and other inventory positions owned 510,698 502,270
Financial instruments and other inventory positions sold, but not yet purchased    
Equity securities 19,923 0
Fixed income securities 2,535 3,300
U.S. government securities 39,303 43,403
Derivative contracts 758 1,811
Total financial instruments and other inventory positions sold, but not yet purchased 62,519 48,514
Asset Pledged as Collateral    
Financial instruments and other inventory positions owned    
Total financial instruments and other inventory positions owned 65,407 67,066
Asset Pledged as Collateral | Short-term Debt    
Financial instruments and other inventory positions owned    
Total financial instruments and other inventory positions owned $ 65,400 $ 67,100