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STOCK-BASED COMPENSATION (Details 1)
 6 Months Ended
Jun. 30, 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 1,453,000
Exercised | shares (702,000)
Forfeiture and cancelled | shares (17,000)
Balance at end | shares 5,336,000
Exercisable at end | shares 3,026,000
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 5.56
Exercised | $ / shares 0.4
Forfeiture and cancelled | $ / shares 3.19
Balance at end | $ / shares 3.02
Exercisable at end | $ / shares $ 1.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Roll Forward]  
Balance at beginning | $ $ 12,476,000
Balance at end | $ $ 8,794,000
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 5 months 27 days