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
 9 Months Ended
Sep. 30, 2022
Sep. 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) 6,295 4,199
Granted, weighted average exercise price (in dollars per share) $ 1.19 $ 4.04
Exercised, options (in shares) (14) (67)
Exercised, weighted average exercise price (in dollars per share) $ 1.08 $ 2.39
Forfeited, options (in shares) (2,325) (1,205)
Forfeited, weighted average exercise price (in dollars per share) $ 3.16 $ 5.47
Outstanding, options (in shares) 19,068 14,869
Outstanding, weighted average exercise price (in dollars per share) $ 3.60 $ 4.68
Outstanding, end of the period (Year) 6 years 3 months 18 days 6 years 9 months 18 days
Exercisable, end of the period (in shares) 10,564 8,092
Exercisable, end of the period (in dollars per share) $ 4.53 $ 4.55
Exercisable, end of the period (Year) 4 years 6 months 5 years 6 months
Vested and expected to vest, end of period (in shares) 17,790 13,851
Vested and expected to vest, end of period (in dollars per share) $ 3.68 $ 4.67
Vested and expected to vest, end of period (Year) 6 years 1 month 20 days 6 years 8 months 12 days