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STOCKHOLDERS' EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Stock options    
Outstanding at beginning of period 435,800  
Outstanding at end of period 435,800 435,800
Exercisable at end of period 419,133  
Weighted average exercise price    
Outstanding at beginning of period $ 8.35  
Outstanding at end of period 8.35 $ 8.35
Exercisable at end of period $ 8.39  
Weighted average remaining contractual term    
Outstanding at end of period 7 years 2 months 12 days 7 years 6 months
Exercisable at the end of period 7 years 2 months 12 days  
Aggregate intrinsic value    
Outstanding at beginning of period $ 216  
Outstanding at end of period 81 $ 216
Exercisable at end of period $ 81