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STOCKHOLDERS' EQUITY (Details Narrative 2) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
weighted average grant date (in dollars per shares) $ 3.35 $ 3.11  
Share-based compensation expense $ 2,143,239 $ 1,659,883  
Total unrecognized estimated compensation expense $ 12,942,820    
Recognized weighted-average period 2 years 3 months 9 days    
Options outstanding $ 11,579    
Share based compensation expense $ 2,586,948 $ 1,751,358  
Stock Options [Member]      
Options outstanding, ending 21,447,719   20,872,824
Options outstanding $ 4.78   $ 4.93
Options Granted 907,000    
Stock Options [Member] | Minimum [Member]      
Option exercise prices (in dollars per shares) $ 0.10    
Stock Options [Member] | Maximum [Member]      
Option exercise prices (in dollars per shares) $ 8.92    
Cash-Settled Stock Appreciation Rights (SARs) [Member]      
Options outstanding, ending 97,000    
Restricted Stock Units [Member]      
Grant date fair value (in dollars per share) $ 4.06    
Share based compensation expense $ 346,414    
Expected term 2 years 8 months 12 days    
Unrecognized estimated compensation expense $ 3,800,000    
Options Granted 1,040,000    
2012 Stock Incentive Plan [Member]      
Number of shares authorized for issuance 10,000,000    
Options outstanding, ending 6,318,974    
Number of shares available for issuance 2,392,833    
2009 Long Term Incentive Compensation Plan [Member]      
Number of shares authorized for issuance 25,000,000    
Options outstanding, ending 15,128,745    
Number of shares available for issuance 44,300    
2009 Long Term Incentive Compensation Plan [Member] | Restricted Stock Units [Member]      
Options outstanding $ 1,040,000