Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
Note 10 - Stock-based Compensation - Stock Option Transactions (Details) - $ / shares
shares in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 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) 6,109 1,414
Granted, weighted average exercise price (in dollars per share) $ 6.84 $ 1.91
Exercised, options (in shares) (162)  
Exercised, weighted average exercise price (in dollars per share) $ 2.71  
Forfeited, options (in shares) (30) (119)
Forfeited, weighted average exercise price (in dollars per share) $ 2.17 $ 2.67
Outstanding, options (in shares) 11,858 5,784
Outstanding, weighted average exercise price (in dollars per share) $ 4.84 $ 2.86
Outstanding, weighted average remaining contractual life (Year) 8 years 219 days 8 years 36 days
Exercisable, end of the period, options (in shares) 3,990 3,237
Exercisable, end of the Exercisable, weighted average exercise price (in dollars per share) $ 2.96 $ 3.33
Exercisable, weighted average remaining contractual life (Year) 6 years 292 days 7 years 73 days
Vested and expected to vest, end of period, options (in shares) 10,678 5,400
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 4.73 $ 2.90
Vested and expected to vest, weighted average remaining contractual life (Year) 8 years 182 days 8 years