Annual report pursuant to Section 13 and 15(d)

Note 12 - Stock-based Compensation - Stock Option Transactions (Details)

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Note 12 - Stock-based Compensation - Stock Option Transactions (Details) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Outstanding, options (in shares) 11,942   5,941
Outstanding, weighted average exercise price (in dollars per share) $ 4.97   $ 2.84
Granted, options (in shares) 4,659 6,362 6,362
Granted, weighted average exercise price (in dollars per share) $ 3.84   $ 6.81
Exercised, options (in shares) (82)   (235)
Exercised, weighted average exercise price (in dollars per share) $ 2.32   $ 2.45
Forfeited, options (in shares) (1,407) (126)  
Forfeited, weighted average exercise price (in dollars per share) $ 5.38 $ 4.50  
Outstanding, options (in shares) 15,112 11,942  
Outstanding, weighted average exercise price (in dollars per share) $ 4.61 $ 4.97  
Outstanding, weighted average remaining contractual life (Year) 6 years 7 months 6 days    
Outstanding, aggregate intrinsic value $ 96,117    
Exercisable, options (in shares) 8,164    
Exercisable, weighted average exercise price (in dollars per share) $ 4.50    
Exercisable, weighted average remaining contractual life (Year) 5 years 3 months 18 days    
Exercisable, aggregate intrinsic value $ 96,117    
Vested and expected to vest, options (in shares) 14,068    
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 4.60    
Vested and expected to vest, weighted average remaining contractual life (Year) 6 years 6 months    
Vested and expected to vest, aggregate intrinsic value $ 96,117