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STOCK-BASED COMPENSATION (Details 1)
3 Months Ended
Mar. 31, 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 1,269,000
Exercised | shares (342,000)
Forfeiture and cancelled | shares (262,000)
Balance at end | shares 5,505,000
Exercisable at end | shares 2,951,000
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 3.73
Exercised | $ / shares 1.17
Forfeiture and cancelled | $ / shares 2.67
Balance at end | $ / shares 3.33
Exercisable at end | $ / shares $ 2.45
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Roll Forward]  
Balance at beginning | $ $ 5,338,000
Balance at end | $ $ 5,968,000
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 6 years 18 days