COLLATERALIZED ARRANGEMENTS AND FINANCING - Units, cost basis and fair value of crypto asset borrowings and borrowed (Details) $ in Thousands	Mar. 31, 2024 USD ($) Unit	Dec. 31, 2023 USD ($)
Crypto assets borrowed
Cost Basis	$ 133,758
Fair Value	231,348	$ 45,212
Crypto asset borrowings
Cost Basis	158,518
Fair Value	$ 272,805	62,980
Bitcoin
Crypto assets borrowed
Units \| Unit	2,688
Cost Basis	$ 112,099
Fair Value	$ 191,573	36,368
Crypto asset borrowings
Units \| Unit	3,040
Cost Basis	$ 128,417
Fair Value	$ 216,703	50,679
Ethereum
Crypto assets borrowed
Units \| Unit	1,122
Cost Basis	$ 2,214
Fair Value	$ 4,093	3,720
Crypto asset borrowings
Units \| Unit	5,601
Cost Basis	$ 10,655
Fair Value	$ 20,420	7,059
Solana
Crypto assets borrowed
Units \| Unit	55,575
Cost Basis	$ 5,198
Fair Value	$ 11,247	3,516
Crypto asset borrowings
Units \| Unit	55,575
Cost Basis	$ 5,198
Fair Value	11,247	3,513
Other crypto assets
Crypto assets borrowed
Cost Basis	14,247
Fair Value	24,435	1,608
Crypto asset borrowings
Cost Basis	14,248
Fair Value	$ 24,435	$ 1,729