SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets measured on nonrecurring basis (Details) $ in Thousands	Jun. 30, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in nonpublic entities that do not report NAV	$ 16,387
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
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	15,737
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	$ 650