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
 6 Months Ended
Jun. 30, 2022
Jun. 30, 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) 5,625 3,156
Granted, weighted average exercise price (in dollars per share) $ 1.23 $ 4.55
Exercised, options (in shares) (14) (67)
Exercised, weighted average exercise price (in dollars per share) $ 1.08 $ 2.39
Forfeited, options (in shares) (1,567) (800)
Forfeited, weighted average exercise price (in dollars per share) $ 2.87 $ 5.67
Outstanding, options (in shares) 19,156 14,231
Outstanding, weighted average exercise price (in dollars per share) $ 3.76 $ 4.88
Outstanding, end of the period (Year) 6 years 6 months 6 years 10 months 24 days
Exercisable, end of the period (in shares) 10,656 8,001
Exercisable, end of the period (in dollars per share) $ 4.65 $ 4.60
Exercisable, end of the period (Year) 4 years 9 months 18 days 5 years 8 months 12 days
Vested and expected to vest, end of period (in shares) 17,879 13,296
Vested and expected to vest, end of period (in dollars per share) $ 3.83 $ 4.85
Vested and expected to vest, end of period (Year) 6 years 4 months 24 days 6 years 9 months 18 days