Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plan - Stock Option Activity (Details)

v3.21.2
Equity Incentive Plan - Stock Option Activity (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Equity Incentive Plan        
Number of Options, Outstanding at beginning of year 246,893 174,175 174,175  
Number of Options, Granted 265,865 93,165    
Number of Options, Expired (13,876) (17,114)    
Number of Options, Forfeited (26,833) (3,333)    
Number of Options, Outstanding at end of year 472,049 246,893 246,893 174,175
Number of Options, Exercisable at end of year 200,500 138,317    
Number of Options, Vested and expected to vest at end of year 472,049 246,893    
Weighted- Average Exercise Price, Outstanding at beginning of year $ 20.90 $ 27.42 $ 27.42  
Weighted- Average Exercise Price, Granted 4.80 6.31    
Weighted- Average Exercise Price, Expired 20.40 10.59    
Weighted- Average Exercise Price, Forfeited 6.51 7.20    
Weighted- Average Exercise Price, Outstanding at end of year 12.66 20.90 $ 20.90 $ 27.42
Weighted- Average Exercise Price, Exercisable at end of year 23.30 32.22    
Weighted- Average Exercise Price, Vested and expected to vest at end of year $ 12.66 $ 20.90    
Weighted-Average Remaining Contractual Life (In Years), Outstanding 7 years 11 months 19 days 7 years 5 months 15 days 7 years 2 months 12 days 6 years 2 months 19 days
Weighted-Average Remaining Contractual Life (In Years), Exercisable at end of year 5 years 11 months 19 days 6 years 18 days    
Weighted-Average Remaining Contractual Life (In Years), Vested and expected to vest at end of year 7 years 11 months 19 days 7 years 5 months 15 days