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SHARE BASED COMPENSATION (Summary of Stock Option Activity) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Share Options      
Outstanding, beginning balance 5,581,776 8,038,950 8,134,830
Granted 1,115,807 615,624 1,805,784
Exercised (2,106,043) (3,015,872) (1,786,449)
Forfeited (263,671) (56,926) (115,215)
Expired
Outstanding, ending balance 4,327,869 5,581,776 8,038,950
Vested and expected to vest 3,959,763    
Exercisable 2,536,418    
Weighted Average Exercise Price      
Outstanding, beginning balance $ 1.77 $ 1.44 $ 0.82
Granted 1.90 3.38 3.05
Exercised 1.46 1.20 0.14
Forfeited 2.98 3.33 2.91
Expired
Outstanding, ending balance 1.88 $ 1.77 $ 1.44
Vested and expected to vest 1.74    
Exercisable $ 1.17    
Weighted Average Remaining Contractual Years      
Outstanding 5 years 10 months 2 days 5 years 8 months 5 days 6 years 2 months 8 days
Vested and expected to vest 5 years 7 months 2 days    
Exercisable 4 years 1 month 2 days    
Outstanding, Aggregate Intrinsic Value $ 56,743 $ 48,412 $ 77,658
Vested and expected to vest, Aggregate Intrinsic Value 52,460    
Exercisable, Aggregate Intrinsic Value $ 35,045