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SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Expiration period 10 years    
Ordinary shares reserved for issuance 8,639,000    
Ordinary shares available for future grant 413,701    
Total intrinsic value of options exercised $ 265 $ 238  
Weighted average period 11 months 8 days    
Total unrecognized compensation cost $ 1,203 $ 1,071 $ 1,625
Additional Shares authorized 13,596,688    
Stock Option [Member]      
Weighted average grant date fair value of options granted $ 1.11 $ 0.78 $ 0.54
RSU [Member]      
Total unrecognized compensation cost $ 1,629    
Stock issued, shares 316,827