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, 2021
Jun. 30, 2020
Outstanding, options, beginning of period (in shares) 11,942 5,941
Outstanding, weighted average exercise price (in dollars per share) $ 4.97 $ 2.84
Granted, options (in shares) 3,156 6,272
Granted, weighted average exercise price (in dollars per share) $ 4.55 $ 6.84
Exercised, options (in shares) (67) (191)
Exercised, weighted average exercise price (in dollars per share) $ 2.39 $ 2.55
Forfeited, options (in shares) (800) (71)
Forfeited, weighted average exercise price (in dollars per share) $ 5.67 $ 2.87
Outstanding, options, end of period (in shares) 14,231 11,951
Outstanding, weighted average exercise price (in dollars per share) $ 4.88 $ 4.91
Outstanding, weighted average remaining contractual life (Year) 6 years 10 months 24 days 8 years 4 months 24 days
Exercisable, end of the period (in shares) 8,001 4,190
Exercisable, weighted average exercise price (in dollars per share) $ 4.60 $ 2.97
Exercisable, weighted average remaining contractual life (Year) 5 years 8 months 12 days 6 years 7 months 6 days
Vested and expected to vest, end of period (in shares) 13,296 10,786
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 4.85 $ 4.79
Vested and expected to vest, weighted average remaining contractual life (Year) 6 years 9 months 18 days 8 years 3 months 18 days