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CLEARING OPERATIONS - Valuation (Details) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Fair Value $ 93,300,000 $ 51,300,000
Bitcoin    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units 884 821
Valuation per Unit $ 70,848 $ 42,492
Fair Value $ 62,700,000 $ 34,900,000
Ethereum    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units 7,723 6,270
Valuation per Unit $ 3,633 $ 2,282
Fair Value $ 28,100,000 $ 14,300,000
Litecoin    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units 14,050 16,329
Valuation per Unit $ 106 $ 74
Fair Value $ 1,500,000 $ 1,200,000
Bitcoin Cash    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units 631 1,374
Valuation per Unit $ 680 $ 261
Fair Value $ 400,000 $ 400,000
USD Coin    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units 635,149 506,652
Valuation per Unit $ 1 $ 1
Fair Value $ 600,000 $ 500,000