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
6 Months Ended
Jun. 30, 2020
Jun. 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) 6,272 1,789
Granted, weighted average exercise price (in dollars per share) $ 6.84 $ 1.93
Exercised, options (in shares) (191) (23)
Exercised, weighted average exercise price (in dollars per share) $ 2.55 $ 1.11
Forfeited, options (in shares) (71) (130)
Forfeited, weighted average exercise price (in dollars per share) $ 2.87 $ 2.59
Outstanding, weighted average remaining contractual life (Year) 8 years 146 days 8 years
Exercisable, end of the period, options (in shares) 4,190 3,257
Exercisable, end of the Exercisable, weighted average exercise price (in dollars per share) $ 2.97 $ 3.36
Exercisable, weighted average remaining contractual life (Year) 6 years 219 days 7 years
Vested and expected to vest, end of period, options (in shares) 10,786 5,654
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 4.79 $ 2.87
Vested and expected to vest, weighted average remaining contractual life (Year) 8 years 109 days 7 years 328 days
Expired, options (in shares)   (47)
Expired, weighted average exercise price (in dollars per share)   $ 4.23
Outstanding, options (in shares) 11,951 6,078
Outstanding, weighted average exercise price (in dollars per share) $ 4.91 $ 2.83