Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Stock-based Compensation - Stock Option Transactions (Details)

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Note 11 - Stock-based Compensation - Stock Option Transactions (Details) - $ / shares
shares in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Outstanding, options (in shares) 15,112 11,942
Outstanding, weighted average exercise price (in dollars per share) $ 4.61 $ 4.97
Granted, options (in shares) 3,870 2,962
Granted, weighted average exercise price (in dollars per share) $ 1.34 $ 4.47
Exercised, options (in shares) (14) (39)
Exercised, weighted average exercise price (in dollars per share) $ 1.08 $ 1.97
Forfeited, options (in shares) (349) (703)
Forfeited, weighted average exercise price (in dollars per share) $ 4.77 $ 5.67
Outstanding, options (in shares) 18,619 14,162
Outstanding, weighted average exercise price (in dollars per share) $ 3.97 $ 4.85
Outstanding, end of the period (Year) 7 years 7 years 1 month 6 days
Exercisable, end of the period (in shares) 10,736 7,887
Exercisable, end of the period (in dollars per share) $ 4.68 $ 4.59
Exercisable, end of the period (Year) 5 years 6 months 5 years 11 months 12 days
Vested and expected to vest, end of period (in shares) 17,344 13,220
Vested and expected to vest, end of period (in dollars per share) $ 4.03 $ 4.83
Vested and expected to vest, end of period (Year) 6 years 10 months 24 days 6 years 11 months 26 days