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STOCK-BASED COMPENSATION - Summary of RSU Activity (Details) - RSUs - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Shares    
Unvested - beginning of period (in shares) 1,069,573 0
Granted (in shares) 516,234 3,884,350
Vested (in shares) (14,654) (2,248,197)
Forfeited/Cancelled (in shares) 0 (65,000)
Unvested - end of period (in shares) 1,571,153 1,571,153
Weighted Average Grant Date Fair Value    
Unvested - beginning of period (in usd per share) $ 22.02 $ 0
Granted (in usd per share) 10.40 23.05
Vested (in usd per share) 14.06 26.29
Forfeited/Cancelled (in usd per share) 0 26.45
Unvested - end of period (in usd per share) $ 18.27 $ 18.27