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STOCKHOLDERS' EQUITY (Details Narrative) - USD ($)
 3 Months Ended
Jan. 12, 2016
Jan. 06, 2016
Jul. 15, 2015
Jul. 09, 2015
Feb. 17, 2015
Feb. 10, 2015
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
2009 Long-term Incentive Plan [Member]                  
Number of shares authorized for issuance             25,000,000    
Options outstanding, ending             17,701,181    
Number of shares available for issuance             3,423,477    
2012 Stock Incentive Plan [Member]                  
Number of shares authorized for issuance             10,000,000    
Options outstanding, ending             2,868,474    
Number of shares available for issuance             7,050,000    
Stock Options [Member]                  
Number of common stock issued during period for stock options exercised (shares)             340,045    
Exercise price of options             $ 3.34   $ 3.28
Weighted average grant date fair value             $ 4.91 $ 3.17  
Sharebased compensation - stock options             $ 4,151,259 $ 728,426  
Unrecognized estimated compensation expense             $ 16,285,000    
Recognized period for recognition - stock option compensation             1 year 8 months 12 days    
Options outstanding, ending             20,569,655    
Stock Options [Member] | Minimum [Member]                  
Exercise price of options             $ .10    
Stock Options [Member] | Maximum [Member]                  
Exercise price of options             $ 8.92    
Options exercised [Member]                  
Number of common stock issued during period for stock options exercised (shares)             340,045 11,250  
Value of common stock issued during period for stock options exercised             $ 786,450 $ 7,208  
Stifel Underwriters [Member]                  
Number of shares issued during the period (shares)     4,423,077 3,846,154          
Share price (in dollars per share)       $ 7.80          
Common stock issued during the period       $ 32,200,000          
Additional common stock issued under offering (shares)       576,923          
Number of days of the option to purchase shares       30 days          
Cowen and Company, LLC (Underwriters) [Member]                  
Number of shares issued during the period (shares)         15,617,282 13,580,246      
Share price (in dollars per share)           $ 4.05      
Common stock issued during the period           $ 59,100,000      
Additional common stock issued under offering (shares)           2,037,036      
Number of days of the option to purchase shares           30 days      
Underwriting Agreement - Goldman And Cowen [Member]                  
Number of shares issued during the period (shares) 17,242,242 15,151,515              
Share price (in dollars per share)   $ 8.25              
Common stock issued during the period   $ 134,900,000              
Additional common stock issued under offering (shares)   2,272,727              
Number of days of the option to purchase shares   30 days