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STOCKHOLDERS' EQUITY (DEFICIT) AND COMPENSATION ARRANGEMENTS - Schedule of Restricted Stock Unit Activity (Details) - Restricted Stock Units
9 Months Ended
Sep. 30, 2023
$ / shares
shares
Restricted Stock Units  
Beginning balance (in shares) | shares 2,876,089
Granted (in shares) | shares 601,314
Vested (in shares) | shares (1,342,961)
Forfeited (in shares) | shares (1,210,548)
Ending balance (in shares) | shares 923,894
Weighted-Average Grant Date Fair Value (per unit)  
Beginning balance (in usd per share) | $ / shares $ 19.33
Granted (in usd per share) | $ / shares 5.26
Vested (in usd per share) | $ / shares 19.32
Forfeited (in usd per share) | $ / shares 15.79
Ending balance (in usd per share) | $ / shares $ 11.32