Post-effective amendment to a registration statement that is not immediately effective upon filing

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

v3.21.1
STOCK BASED COMPENSATION - Option Activity of the Plan (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Number of shares        
Outstanding at beginning of period (in shares) 19,553 18,072 18,072  
Granted (in shares)     8,463  
Exercised (in shares) (163)   (522)  
Forfeited/expired (in shares) (12)   (6,460)  
Outstanding at end of period (in shares) 19,378   19,553 18,072
Options vested at end of period (in shares) 11,044   10,905  
Options vested or expected to vest at end of period (in shares) 18,673   18,818  
Weighted-Average Exercise Price per share        
Outstanding at beginning of period (in dollars per share) $ 1.53 $ 2.01 $ 2.01  
Granted (in dollars per share)     1.51  
Exercised (in dollars per share) 1.10   0.62  
Forfeited/expired (in dollars per share) 1.40   2.92  
Outstanding at end of period (in dollars per share) 1.53   1.53 $ 2.01
Options vested at end of period (in dollars per share) 1.55   1.53  
Options vested or expected to vest at December 31, 2020 $ 1.54   $ 1.53  
Weighted-average remaining contractual term (in years) 7 years 6 months 3 days   7 years 9 months 7 years 10 months 2 days
Options vested at December 31, 2020 6 years 3 months 14 days   6 years 6 months 7 days  
Options vested or expected to vest at December 31, 2020 7 years 5 months 12 days   7 years 8 months 8 days  
Aggregate intrinsic value of options outstanding $ 259,023   $ 306,408 $ 24,045
Weighted average grant date fair value for options granted   $ 1.65 $ 3.52 $ 1.78
Aggregate intrinsic value of options exercised 100 $ 300 $ 1,800 $ 3,400
Options vested (in dollars) 147,481   170,868  
Options vested or expected to vest (in dollars) $ 249,529   $ 294,824