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FAIR VALUE MEASUREMENTS - Debt Securities Schedule of Fair Value (Details) - Investments in debt securities - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 26,437 $ 0
Investment 20,000 45,000
Fair value adjustments included in other (expense) income, net 932 2,369
Balance at end of period $ 47,369 $ 47,369