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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
May 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding 10,357,133     11,065,658
Reserved shares of common stock for issuance ( in shares) 46,183,689      
Options granted, weighted-average grant date fair value (in dollars per share) $ 16.84      
Options granted (in shares) 709,448 2,354,515    
Options exercised, intrinsic value $ 47.6 $ 0.1    
Remaining unrecognized stock-based compensation expense $ 17.9      
2009 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding 9,647,780      
Reserved shares of common stock for issuance ( in shares) 0      
2021 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Reserved shares of common stock for issuance ( in shares)     23,722,254  
Outstanding stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price as a percentage of fair value 100.00%      
Exercise price as a percentage of fair value for shareholders owning specified minimum amount 110.00%      
Significant shareholder threshold used for determining exercise price 10.00%      
Exercise period 10 years      
Weighted average period for recognition of stock-based compensation expense 3 years 7 months 6 days      
Outstanding stock options | Share-based Payment Arrangement, Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year      
Vesting percentage 25.00%      
Outstanding stock options | Share-based Payment Arrangement, Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
Vesting percentage 2.08%