Quarterly report pursuant to Section 13 or 15(d)

STOCK BASED COMPENSATION - Restricted Stock Units (Details)

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STOCK BASED COMPENSATION - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award    
Expenses recognized $ 8.7 $ 8.6
Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award    
Vesting period 4 years  
Cliff Vesting Period 1 year  
Unrecognized compensation costs, non-vested RSUs $ 67.6  
Weighted-average period 2 years 8 months 12 days  
Shares Subject to Vesting    
Balance at beginning of period, unvested shares (in shares) 22,145  
Granted (in shares) 3,895  
Vested (in shares) (1,808)  
Cancelled/Forfeited (in shares) (1,356)  
Balance at end of period, unvested shares (in shares) 22,876  
Weighted Average Grant Date Fair Value    
Balance at beginning of Period, unvested shares (in dollars per share) $ 4.15  
Granted (in dollars per share) 1.91  
Vested (in dollars per share) 4.90  
Cancelled/Forfeited (in dollars per share) 4.09  
Balance at end of Period, unvested shares (in dollars per share) $ 3.71