Quarterly report pursuant to Section 13 or 15(d)

STOCK BASED COMPENSATION - Option Activity of the Plan (Details)

v3.21.2
STOCK BASED COMPENSATION - Option Activity of the Plan (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Number of shares      
Outstanding at beginning of period (in shares) 19,553    
Exercised (in shares) (4,462)    
Forfeited/expired (in shares) (591)    
Outstanding at end of period (in shares) 14,500   19,553
Options vested at end of period (in shares) 9,062    
Options vested or expected to vest at end of period (in shares) 13,942    
Weighted-Average Exercise Price per share      
Outstanding at beginning of period (in dollars per share) $ 1.53    
Exercised (in dollars per share) 1.17    
Forfeited/expired (in dollars per share) 1.45    
Outstanding at end of period (in dollars per share) 1.64   $ 1.53
Options vested at end of period (in dollars per share) 1.72    
Options vested or expected to vest at end of period $ 1.65    
Weighted-average remaining contractual term (in years) 7 years 3 months 25 days   7 years 9 months
Options vested at end of period 6 years 6 months    
Options vested or expected to vest at end of period 7 years 3 months 3 days    
Aggregate intrinsic value of options outstanding $ 80,166   $ 306,408
Options vested (in dollars) 49,349    
Options vested or expected to vest (in dollars) 76,947    
Weighted average grant date fair value for options granted   $ 0.98  
Aggregate intrinsic value of options exercised $ 49,600 $ 1,700