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FAIR VALUE MEASUREMENTS - Schedule of Changes in Liability for Unobservable Inputs (Details) - Convertible warrant stock liability
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Beginning balance $ 95,342
Changes in estimated fair value 133,577
Assumption of warrant liability upon Merger 303,221
Conversion of warrants upon Merger (59,442)
Exchange of warrants (168,647)
Exercised warrants (253)
Ending balance $ 303,798