Quarterly report pursuant to Section 13 or 15(d)

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

v3.22.1
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, 2022
Mar. 31, 2021
Dec. 31, 2021
Number of shares      
Outstanding at beginning of period (in shares) 13,249    
Exercised (in shares) (787)    
Forfeited/expired (in shares) (283)    
Outstanding at end of period (in shares) 12,179   13,249
Options vested at end of period (in shares) 8,001    
Options vested or expected to vest at end of period (in shares) 11,652    
Weighted-Average Exercise Price per share      
Outstanding at beginning of period (in dollars per share) $ 1.73    
Exercised (in dollars per share) 1.14    
Forfeited/expired (in dollars per share) 1.68    
Outstanding at end of period (in dollars per share) 1.77   $ 1.73
Options vested at end of period (in dollars per share) 1.91    
Options vested or expected to vest at end of period $ 1.78    
Weighted-average remaining contractual term (in years) 7 years 21 days   7 years 2 months 23 days
Options vested at end of period 6 years 5 months 19 days    
Options vested or expected to vest at end of period 7 years 3 days    
Aggregate intrinsic value of options outstanding $ 36,302   $ 42,775
Options vested (in dollars) 22,710    
Options vested or expected to vest (in dollars) 40,852    
Aggregate intrinsic value of options exercised 2,500 $ 100  
Total stock based compensation expenses 9,912 2,217  
Unrecognized stock-based compensation expense, stock options $ 6,900    
Weighted-average period 2 years 2 months 12 days    
Stock option      
Weighted-Average Exercise Price per share      
Total stock based compensation expenses $ 900 $ 1,200