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FAIR VALUE MEASUREMENTS - Debt Securities Schedule of Fair Value (Details) - Investments in debt securities - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 47,369 $ 0
Investment 13,000 58,000
Fair value adjustments included in other (expense) income, net 784 3,153
Balance at end of period $ 61,153 $ 61,153