Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Summary of Stock Options - Summary of Option Activity Under All Plans (Details)

v3.21.2
Note 12 - Summary of Stock Options - Summary of Option Activity Under All Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2021
Options outstanding, beginning of period (in shares) 986,399
Options outstanding, beginning of period, weighted average exercise price (in dollars per share) $ 19.10
Options granted (in shares) 2,251,000
Options granted, weighted average exercise price (in dollars per share) $ 2.73
Options exercised (in shares) 0
Options exercised, weighted average exercise price (in dollars per share)
Options canceled (in shares) (41,657)
Options canceled, weighted average exercise price (in dollars per share) $ 23.35
Options outstanding, end of period (in shares) 3,195,742
Options outstanding, end of period, weighted average exercise price (in dollars per share) $ 7.52
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) 9 years 3 months 18 days
Options outstanding, aggregate intrinsic value $ 0
Vested and exercisable and expected to vest, end of period (in shares) 2,932,744
Vested and exercisable and expected to vest, end of period, weighted average exercise price (in dollars per share) $ 7.88
Vested and exercisable and expected to vest, end of period, weighted average remaining contractual term (Year) 9 years 3 months 18 days
Vested and exercisable and expected to vest, end of period, aggregate intrinsic value $ 0
Vested and exercisable, end of period (in shares) 581,757
Vested and exercisable, end of period, weighted average exercise price (in dollars per share) $ 23.17
Vested and exercisable, end of period, weighted average remaining contractual term (Year) 8 years 6 months
Vested and exercisable, end of period, aggregate intrinsic value $ 0