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STOCK-BASED COMPENSATION (Details 1) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Balance at beginning 5,636,000 4,634,000
Granted 1,190,000 1,327,000
Exercised (2,007,000) (40,000)
Forfeiture and cancelled (217,000) (285,000)
Balance at end 4,602,000 5,636,000
Exercisable at end 3,250,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]    
Balance at beginning $ 1.04 $ 0.81
Granted 3.82 2.01
Exercised 0.82 0.42
Forfeiture and cancelled 1.77 1.81
Balance at end 1.82 1.04
Exercisable at end 1.09  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Fair Value [Roll Forward]    
Balance at beginning $ 0.41 0.41
Granted   0.33
Forfeiture and cancelled   0.38
Balance at end   $ 0.41
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Roll Forward]    
Balance at beginning $ 7,317,000 $ 5,300,000
Balance at end $ 12,476,000 $ 7,317,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Average Remaining Term [Roll Forward]    
Balance at beginning 5 years 22 days 5 years 5 months 26 days
Balance at end 4 years 2 months 23 days 5 years 22 days
Exercisable at end 3 years 7 months 24 days