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, 2021
Mar. 31, 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) 2,962 6,109
Granted, weighted average exercise price (in dollars per share) $ 4.47 $ 6.84
Exercised, options (in shares) (39) (162)
Exercised, weighted average exercise price (in dollars per share) $ 1.97 $ 2.71
Forfeited, options (in shares) (703) (30)
Forfeited, weighted average exercise price (in dollars per share) $ 5.67 $ 2.17
Outstanding, options, end of period (in shares) 14,162 11,858
Outstanding, weighted average exercise price (in dollars per share) $ 4.85 $ 4.84
Outstanding, weighted average remaining contractual life (Year) 7 years 36 days 8 years 219 days
Exercisable, end of the period (in shares) 7,887 3,990
Exercisable, weighted average exercise price (in dollars per share) $ 4.59 $ 2.96
Exercisable, weighted average remaining contractual life (Year) 5 years 346 days 6 years 292 days
Vested and expected to vest, end of period (in shares) 13,220 10,678
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 4.83 $ 4.73
Vested and expected to vest, weighted average remaining contractual life (Year) 6 years 361 days 8 years 182 days