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STOCK-BASED COMPENSATION PLANS (Details 2) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of stock option activity under the option Plan      
Number of Shares, Granted 200 700  
Weighted Average Exercise Price, Granted $ 2.99 $ 0.83  
Weighted Average Remaining Contractual Life Exercisable 5 years 2 months 19 days    
Employee Stock Option [Member]      
Summary of stock option activity under the option Plan      
Balance Beginning 2,142 2,261  
Number of Shares, Granted 215 722  
Number of Shares, Exercised (357) (38)  
Number of Shares, Forfeited (115) (803)  
Balance Ending 1,885 2,142  
Number of Shares, Exercisable at December 31, 2018 1,317    
Weighted Average Exercise Price, Outstanding Beginning $ 0.56 $ 0.40  
Weighted Average Exercise Price, Granted 2.99 0.83  
Weighted Average Exercise Price, Exercised 0.44 1.02  
Weighted Average Exercise Price, Forfeited 1.48 0.33  
Weighted Average Exercise Price, Outstanding Ending 0.80 $ 0.56  
Weighted Average Exercise Price, Exercisable $ 0.44    
Weighted Average Remaining Contractual Life, Outstanding 6 years 3 months 25 days 6 years 6 months  
Weighted Average Remaining Contractual Life Exercisable 5 years 2 months 19 days    
Aggregate Intrinsic Value, Outstanding $ 4,085 $ 5,334 $ 135