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STOCK-BASED COMPENSATION PLANS (Details 1) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Summary of stock option activity under the option Plan        
Number of Shares, Granted 270   435  
Weighted Average Exercise Price, Granted $ 0.39   $ 0.32  
Employee Stock Option [Member]        
Summary of stock option activity under the option Plan        
Balance Beginning   2,126    
Number of Shares, Granted   0    
Number of Shares, Forfeited   (42)    
Number of Shares, Exercised   (317)    
Balance Ending   1,767   2,126
Number of Shares, Exercisable at June 30, 2018   1,278    
Weighted Average Exercise Price, Outstanding Beginning   $ 0.56    
Weighted Average Exercise Price, Granted   0    
Weighted Average Exercise Price, Forfeited   1.75    
Weighted Average Exercise Price, Exercised   0.43    
Weighted Average Exercise Price, Outstanding Ending   0.55   $ 0.56
Weighted Average Exercise Price, Exercisable   $ 0.38    
Weighted Average Remaining Contractual Life, Outstanding   6 years 3 months 18 days   6 years 6 months
Weighted Average Remaining Contractual Life Exercisable   5 years 3 months 18 days    
Aggregate Intrinsic Value, Outstanding   $ 4,499   $ 5,579
Aggregate Intrinsic Value, Exercisable   $ 3,421