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EQUITY INCENTIVE PLANS - Summary of Restricted Stock Units and Performance-based Restricted Stock Units Activity (Details) - Restricted Stock Units and Performance-based Restricted Stock Units - $ / shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Number of RSUs and PRSUs    
Outstanding, beginning balance (in shares) 1,174,087  
RSUs and PRSUs granted (in shares) 1,466,954  
RSUs and PRSUs vested (in shares) (749,254)  
RSUs and PRSUs canceled (in shares) (48,159)  
Outstanding, ending balance (in shares) 1,843,628  
Weighted Average Grant Date Fair Value    
Outstanding, beginning of period (in dollars per share) $ 2.53  
RSUs and PRSUs granted (in dollars per share) 0.83 $ 2.56
RSUs and PRSUs vested (in dollars per share) 1.34  
RSUs and PRSUs canceled (in dollars per share) 2.86  
Outstanding, end of period (in dollars per share) $ 1.65