Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Stock-based Compensation - Stock Option Transactions (Details)

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Note 10 - Stock-based Compensation - Stock Option Transactions (Details) - $ / shares
shares in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Outstanding, options (in shares) 5,941 4,489
Outstanding, weighted average exercise price (in dollars per share) $ 2.84 $ 3.11
Granted, options (in shares) 6,352 2,018
Granted, weighted average exercise price (in dollars per share) $ 6.82 $ 1.97
Exercised, options (in shares) (215) (34)
Exercised, weighted average exercise price (in dollars per share) $ 2.49 $ 1.11
Forfeited, options (in shares) (71) (322)
Forfeited, weighted average exercise price (in dollars per share) $ 2.87 $ 2.36
Outstanding, weighted average remaining contractual life (Year) 8 years 73 days 7 years 292 days
Exercisable, end of the period, options (in shares) 4,310 3,340
Exercisable, end of the Exercisable, weighted average exercise price (in dollars per share) $ 2.99 $ 3.34
Exercisable, weighted average remaining contractual life (Year) 6 years 182 days 6 years 292 days
Vested and expected to vest, end of period, options (in shares) 10,853 5,689
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 4.82 $ 2.86
Vested and expected to vest, weighted average remaining contractual life (Year) 8 years 36 days 7 years 255 days
Expired, options (in shares)   (47)
Expired, weighted average exercise price (in dollars per share)   $ 4.33
Outstanding, options (in shares) 12,007 6,104
Outstanding, weighted average exercise price (in dollars per share) $ 4.93 $ 2.81