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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of investments in the VIE (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Variable Interest Entity [Line Items] |  |
Securities and other investments owned, at fair value | $ 341,770 | $ 809,049
Other assets | 28,432 | 47,492
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Securities and other investments owned, at fair value | 3,948 | 28,573
Loans receivable, at fair value | 34,895 | 250,801
Other assets | 3,532 | 11,418
Maximum exposure to loss | $ 42,375 | $ 290,792

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