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FAIR VALUE MEASUREMENTS - Schedule of Changes in Liability for Unobservable Inputs (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance at January 1 $ 95,342
Change in fair value 66,397
Exercised warrants (253)
Ending balance at December 31 $ 161,486