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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets measured on nonrecurring basis (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in nonpublic entities that do not report NAV | $ 3,424 | $ 1,628
Quoted prices in active markets for identical assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in nonpublic entities that do not report NAV | 0 | 0
Other observable inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in nonpublic entities that do not report NAV | 3,424 | 1,602
Significant unobservable inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in nonpublic entities that do not report NAV | $ 0 | $ 26

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