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
1 Months Ended 3 Months Ended
Jul. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Cliff Vesting Period 1 year    
Expenses recognized $ 3,600,000 $ 8,600,000 $ 800,000
Weighted-average period   2 years 2 months 12 days  
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   4 years  
Cliff Vesting Period   1 year  
Unrecognized compensation costs, non-vested RSUs   $ 112.1  
Weighted-average period   3 years 3 months 18 days  
Shares Subject to Vesting      
Balance at beginning of period, unvested shares (in shares)   16,395  
Granted (in shares)   5,527  
Vested (in shares)   (520)  
Cancelled/Forfeited   (392)  
Balance at end of period, unvested shares (in shares)   21,010  
Weighted Average Grant Date Fair Value      
Balance at beginning of Period, unvested shares (in dollars per share)   $ 7.54  
Granted (in dollars per share)   4.20  
Vested (in dollars per share)   13.41  
Cancelled/Forfeited (in dollars per share)   11.09  
Balance at end of Period, unvested shares (in dollars per share)   $ 6.44