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 Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Weighted Average Grant Date Fair Value        
Stock-based compensation expense $ 7,683 $ 12,040 $ 26,699 $ 41,170
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 $ 59,000   $ 59,000  
Weighted-average period     2 years 4 months 24 days  
Shares Subject to Vesting        
Balance at beginning of period, unvested shares (in shares)     22,145  
Granted (in shares)     9,677  
Vested (in shares)     (4,062)  
Cancelled/Forfeited (in shares)     (2,278)  
Balance at end of period, unvested shares (in shares) 25,482   25,482  
Weighted Average Grant Date Fair Value        
Balance at beginning of Period, unvested shares (in dollars per share)     $ 4.15  
Granted (in dollars per share)     1.86  
Vested (in dollars per share)     5.28  
Cancelled/Forfeited (in dollars per share)     4.57  
Balance at end of Period, unvested shares (in dollars per share) $ 3.07   $ 3.07  
Stock-based compensation expense $ 7,300 $ 11,600 $ 25,000 $ 38,200