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STOCK-BASED COMPENSATION (Details 1)
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Balance at beginning | shares 4,840,000
Granted | shares 1,372,000
Exercised | shares (482,000)
Forfeiture and cancelled | shares (272,000)
Balance at end | shares 5,458,000
Exercisable at end | shares 2,590,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Balance at beginning | $ / shares $ 3.04
Granted | $ / shares 3.78
Exercised | $ / shares 1.13
Forfeiture and cancelled | $ / shares 2.72
Balance at end | $ / shares 3.41
Exercisable at end | $ / shares $ 2.39
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Roll Forward]  
Balance at beginning | $ $ 5,338,000
Balance at end | $ $ 5,786,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Average Remaining Term [Roll Forward]  
Balance at beginning 5 years 18 days
Balance at end 5 years 8 months 1 day