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STOCKHOLDERS' EQUITY (DEFICIT) AND COMPENSATION ARRANGEMENTS - Schedule of Restricted Stock Unit Activity (Details) - Restricted Stock Units
6 Months Ended
Jun. 30, 2023
$ / shares
shares
Restricted Stock Units  
Beginning balance (in shares) | shares 2,876,089
Granted (in shares) | shares 563,429
Vested (in shares) | shares (1,092,252)
Forfeited (in shares) | shares (1,119,327)
Ending balance (in shares) | shares 1,227,939
Weighted-Average Grant Date Fair Value (per unit)  
Beginning balance (in usd per share) | $ / shares $ 19.33
Granted (in usd per share) | $ / shares 5.20
Vested (in usd per share) | $ / shares 21.88
Forfeited (in usd per share) | $ / shares 16.03
Ending balance (in usd per share) | $ / shares $ 10.55