Quarterly report pursuant to Section 13 or 15(d)

4. Stock Incentive Plan (Details 1)

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4. Stock Incentive Plan (Details 1) - shares
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of shares outstanding 1,292,573 1,087,463 1,105,896
Number of shares fully vested and exercisable 805,296    
Option 1      
Exercise price $0.00-$5.00    
Number of shares outstanding 555,420    
Weighted average remaining contractual life 6 years 5 months 16 days    
Number of shares fully vested and exercisable 492,280    
Weighted average remaining contractual life 6 years 4 months 24 days    
Option 2      
Exercise price $5.01-$10.00    
Number of shares outstanding 532,043    
Weighted average remaining contractual life 8 years 3 months 4 days    
Number of shares fully vested and exercisable 305,837    
Weighted average remaining contractual life 8 years 2 months 19 days    
Option 3      
Exercise price $10.01-15.00    
Number of shares outstanding 189,985    
Weighted average remaining contractual life 9 years 10 months 2 days    
Number of shares fully vested and exercisable 5,648    
Weighted average remaining contractual life 9 years 10 months 2 days    
Option 4      
Exercise price $15.01-20.00    
Number of shares outstanding 15,125    
Weighted average remaining contractual life 9 years 9 months 18 days    
Number of shares fully vested and exercisable 1,531    
Weighted average remaining contractual life 9 years 10 months 2 days