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STOCKHOLDERS' EQUITY (Details Narrative) - USD ($)
 3 Months Ended 9 Months Ended
Jan. 12, 2016
Jan. 06, 2016
Jul. 15, 2015
Jul. 09, 2015
Feb. 17, 2015
Feb. 10, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Preferred stock, par value (in dollars per share)             $ 0.001   $ 0.001   $ 0.001
Preferred stock, shares authorized             10,000,000   10,000,000   10,000,000
Preferred stock, shares issued             0   0   0
Preferred stock, shares outstanding             0   0   0
Common stock, shares authorized             350,000,000   350,000,000   350,000,000
Common stock, shares issued             196,580,212   196,580,212   177,928,041
Common stock, shares outstanding             196,580,212   196,580,212   177,928,041
2009 Long-term Incentive Plan [Member]                      
Weighted average grant date fair value             $ 4.70   $ 4.70    
Number of shares authorized for issuance             25,000,000   25,000,000    
Options outstanding, ending             17,837,449   17,837,449    
Number of shares available for issuance             3,122,069   3,122,069    
2012 Stock Incentive Plan [Member]                      
Number of shares authorized for issuance             10,000,000   10,000,000    
Options outstanding, ending             2,868,474   2,868,474    
Number of shares available for issuance             7,050,000   7,050,000    
Stock Options [Member]                      
Weighted average grant date fair value               $ 3.49   $ 3.49  
Exercise price - lower                 $ 0.10    
Exercise price - upper                 $ 8.92    
Sharebased compensation - stock options             $ 3,982,759 $ 1,626,862 $ 12,294,089 $ 4,328,964  
Unrecognized estimated compensation expense             $ 10,225,000   $ 10,225,000    
Recognized period for recognition - stock option compensation                 2 years 1 month 10 days    
Total Stock Options [Member]                      
Common stock issued during period for stock options exercised, shares             127,109        
Stock Options Cash Exercise [Member]                      
Common stock issued during period for stock options exercised, shares             10,000 95,000 427,168 472,867  
Common stock issued during period for stock options exercised             $ 1,018 $ 98,474 $ 979,060 $ 589,829  
Stock Options Cashless Exercise [Member]                      
Common stock issued during period for stock options exercised, shares             78,017   78,017    
Options exercised - cashless             117,109   117,109    
Underwriting Agreement - Goldman And Cowen [Member]                      
Number of shares issued during the period 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   2,272,727                  
Number of days of the option to purchase shares   30 days                  
Stifel Underwriters [Member]                      
Number of shares issued during the period     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       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         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           2,037,036          
Number of days of the option to purchase shares           30 days