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STOCKHOLDERS' EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Stock options    
Outstanding at beginning of period 435,800  
Granted 7,000  
Forfeited (16,500)  
Outstanding at end of period 426,300 435,800
Exercisable at end of period 412,633  
Weighted average exercise price    
Outstanding at beginning of period $ 8.35  
Granted 5.60  
Forfeited 7.98  
Outstanding at end of period 8.32 $ 8.35
Exercisable at end of period $ 8.38  
Weighted average remaining contractual term    
Outstanding at end of period 6 years 8 months 12 days 7 years 6 months
Exercisable at the end of period 6 years 7 months 6 days  
Aggregate intrinsic value    
Outstanding at beginning of period $ 216  
Outstanding at end of period 16 $ 216
Exercisable at end of period $ 16