Quarterly report pursuant to Section 13 or 15(d)

Stock Options (Details Narrative)

v3.19.1
Stock Options (Details Narrative) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2014
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Jan. 02, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   $ 3,088,939 $ 1,884,916      
Option granted expected term   6 years 2 months 30 days        
Weighted average grant-date fair value, options granted   $ 5.40 $ 6.20      
Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Average intrinsic value of options exercised   $ 216,306 $ 142,949      
Fair value of options vested   $ 17,136,030 $ 9,911,261      
Total unrecognized compensation expense       $ 24,265,642    
Share-based compensation expense, not yet recognized weighted average period of recognition   3 years 4 days        
2014 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of outstanding common shares         7.00%  
Increase in number of shares of common stock available for issuance         2,500,000  
Aggregate common stock available for stock options granted, shares       15,543,739    
Shares available for grant   5,712,719   5,072,241    
2014 Equity Incentive Plan [Member] | January 1, 2019 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of outstanding common shares       7.00%    
Increase in number of shares of common stock available for issuance       3,000,000    
Aggregate common stock available for stock options granted, shares           18,543,739
Shares available for grant           8,072,241
2014 Equity Incentive Plan [Member] | Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option vesting term 4 years          
Stock option expiration period 10 years          
Evergreen Provision [Member] | 2014 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of outstanding common shares 7.00%