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STOCK-BASED COMPENSATION - Summary of Restricted Stock Units and Restricted Stock Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
RSUs outstanding      
Number of Restricted Stock Units / Awards      
Beginning outstanding balance (in shares) 224    
Granted (in shares) 600    
Released (in shares) (111)    
Forfeited (in shares) (48)    
Ending outstanding balance (in shares) 665    
Weighted Average Grant Date Fair Value      
Beginning outstanding balance (in dollars per share) $ 6.66    
Granted (in dollars per share) 4.78    
Released (in dollars per share) 6.80    
Forfeited (in dollars per share) 6.04    
Ending outstanding balance (in dollars per share) $ 4.97    
Share-based Compensation Arrangement by Share-based Payment Award, Additional Disclosures [Abstract]      
Weighted average remaining contractual life / recognition period, outstanding 1 year 3 months 25 days 6 months 21 days  
Aggregate intrinsic value, outstanding $ 3,700   $ 1,280
RSAs outstanding      
Number of Restricted Stock Units / Awards      
Beginning outstanding balance (in shares) 0    
Granted (in shares) 114    
Released (in shares) 0    
Forfeited (in shares) 0    
Ending outstanding balance (in shares) 114    
Weighted Average Grant Date Fair Value      
Beginning outstanding balance (in dollars per share) $ 0    
Granted (in dollars per share) 4.78    
Released (in dollars per share) 0    
Forfeited (in dollars per share) 0    
Ending outstanding balance (in dollars per share) $ 4.78    
Share-based Compensation Arrangement by Share-based Payment Award, Additional Disclosures [Abstract]      
Weighted average remaining contractual life / recognition period, outstanding 1 month 13 days 0 years