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A summary of activity under the 2009, 2012 and 2019 Plans and related information during the three months ended March 31, 2019 is as follows: (Details) - Share-based Payment Arrangement, Option [Member] - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares under options, beginning 25,030,234    
Weighted average exercise price, beginning $ 4.65    
Weighted average remaining contractual life 5 years 9 months 7 days   5 years 10 months 2 days
Aggregate intrinsic value, beginning $ 3,668,171    
Number of shares under options, granted 636,500    
Weighted average exercise price, granted $ 1.64    
Number of shares under options, exercised (350,666) (276,383)  
Weighted average exercise price, exercised $ 0.21    
Aggregate intrinsic value, exercised $ 725,199    
Number of shares under options, expired (50,472)    
Weighted average exercise price, expired $ 0.41    
Number of shares under options, cancelled forfeited (110,375)    
Weighted average exercise price, cancelled forfeited $ 4.48    
Number of shares under options, ending 25,155,221   25,030,234
Weighted average exercise price, ending $ 4.65   $ 4.65
Aggregate intrinsic value, ending $ 787,178   $ 3,668,171
Number of shares under options, vested and exercisable ending 19,258,556    
Weighted average exercise price, vested and exercisable ending $ 5.02    
Weighted average remaining contractual life, vested and exercisable 4 years 9 months 7 days    
Aggregate intrinsic value, vested and exercisable ending $ 787,178    
Number of shares under options, unvested ending 5,896,665    
Weighted average exercise price, unvested ending $ 3.42    
Weighted average remaining contractual life, unvested 9 years 18 days