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STOCK-BASED COMPENSATION PLANS (Details 2) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Summary of stock option activity under the option Plan    
Number of Shares, Granted 300  
Weighted Average Exercise Price, Granted $ 4.37  
Weighted Average Remaining Contractual Life, Outstanding 6 months 9 days  
Aggregate Intrinsic Value, Exercisable $ 5,298  
Employee Stock Option [Member]    
Summary of stock option activity under the option Plan    
Balance Beginning 1,885  
Number of Shares, Granted 305  
Number of Shares, Forfeited (27)  
Number of Shares, Exercised (16)  
Balance Ending 2,147  
Number of Shares, Exercisable at December 31, 2018 1,310  
Weighted Average Exercise Price, Outstanding Beginning $ 0.80  
Weighted Average Exercise Price, Granted 4.37  
Weighted Average Exercise Price, Exercised 0.51  
Weighted Average Exercise Price, Forfeited 1.81  
Weighted Average Exercise Price, Outstanding Ending 0.45  
Weighted Average Exercise Price, Exercisable $ 0.45  
Weighted Average Remaining Contractual Life, Outstanding 6 years 7 months 6 days  
Weighted Average Remaining Contractual Life Exercisable 5 years  
Aggregate Intrinsic Value, Outstanding $ 7,018,000 $ 4,085,000