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STOCK-BASED COMPENSATION (Details 1)
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Balance at beginning | shares 4,602,000
Granted | shares 1,096,000
Exercised | shares (588,000)
Forfeiture and cancelled | shares (23,000)
Balance at end | shares 5,087,000
Exercisable at end | shares 2,868,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Balance at beginning | $ / shares $ 1.82
Granted | $ / shares 5.76
Exercised | $ / shares 0.4
Forfeiture and cancelled | $ / shares 2.6
Balance at end | $ / shares 2.83
Exercisable at end | $ / shares $ 1.56
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Roll Forward]  
Balance at beginning | $ $ 12,476,000
Balance at end | $ $ 8,329,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Average Remaining Term [Roll Forward]  
Balance at beginning 4 years 2 months 23 days
Balance at end 5 years 3 months 4 days