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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets measured on nonrecurring basis (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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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 | $ 1,476 | $ 20,251
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 | 1,476 | 18,659
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 | $ 1,592

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