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STOCKHOLDERS' EQUITY (Details 1) - Stock Options [Member] - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Number Options    
Options outstanding, beginning 20,725,325  
Options Granted 185,500  
Options Exercised (340,045)  
Options Expired/Forfeited (1,125)  
Options outstanding, ending 20,569,655  
Vested and exercisable 15,988,578  
Unvested 4,581,077  
Weighted Average Exercise Price    
Options outstanding, beginning $ 3.28  
Granted 7.59  
Exercised 2.31  
Expired/Forfeited 3.59  
Options outstanding, ending 3.34  
Vested and exercisable 2.17  
Unvested $ 7.42  
Weighted Average Remaining Contractual Life    
Options outstanding, ending 6 years 3 months 19 days 6 years 6 months
Vested and exercisable 5 years 6 months  
Unvested 9 years 2 months 12 days  
Aggregate Intrinsic Value    
Options outstanding, beginning $ 146,864,184  
Options exercised 2,051,619  
Options outstanding, ending 71,940,245  
Vested and exercisable 69,261,183  
Unvested $ 2,679,062