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STOCKHOLDERS' EQUITY (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Stock options  
Outstanding at beginning of period | shares 435,800
Granted | shares 7,000
Forfeited | shares (10,000)
Outstanding at end of period | shares 432,800
Exercisable at end of period | shares 419,133
Weighted average exercise price  
Outstanding at beginning of period | $ / shares $ 8.35
Granted | $ / shares 5.60
Forfeited | $ / shares 7.30
Outstanding at end of period | $ / shares 8.33
Exercisable at end of period | $ / shares $ 8.39
Weighted average remaining contractual term  
Outstanding at end of period 7 years
Exercisable at the end of period 6 years 10 months 24 days
Aggregate intrinsic value  
Outstanding at beginning of period | $ $ 216
Outstanding at end of period | $ 20
Exercisable at end of period | $ $ 20