Annual report pursuant to Section 13 and 15(d)

4. Stock Incentive Plan (Details 1)

v3.21.1
4. Stock Incentive Plan (Details 1) - shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of shares outstanding 1,258,577 1,087,463 1,105,896
Number of shares fully vested and exercisable 989,904    
Option 1      
Exercise price $0.001 - $5.00    
Number of shares outstanding 557,420    
Weighted average remaining contractual life outstanding 5 years 8 months 19 days    
Number of shares fully vested and exercisable 543,940    
Weighted average remaining contractual life exercisable 5 years 8 months 12 days    
Option 2      
Exercise price $5.01 - $10.00    
Number of shares outstanding 538,956    
Weighted average remaining contractual life outstanding 7 years 6 months    
Number of shares fully vested and exercisable 373,373    
Weighted average remaining contractual life exercisable 7 years 4 months 28 days    
Option 3      
Exercise price $10.01 - $15.00    
Number of shares outstanding 147,076    
Weighted average remaining contractual life outstanding 9 years 25 days    
Number of shares fully vested and exercisable 64,403    
Weighted average remaining contractual life exercisable 9 years 14 days    
Option 4      
Exercise price $15.01 - $20.00    
Number of shares outstanding 15,125    
Weighted average remaining contractual life outstanding 9 years 18 days    
Number of shares fully vested and exercisable 8,188    
Weighted average remaining contractual life exercisable 9 years 25 days