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Consolidated Balance Sheets (Parenthetical)
$ in Thousands
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2018
₪ / shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2017
₪ / shares
Statement of Financial Position [Abstract]        
Net of allowances for doubtful accounts | $ $ 24   $ 9  
Ordinary shares, par value per share | ₪ / shares   ₪ 0.20   ₪ 0.20
Ordinary shares, shares authorized 20,000,000   20,000,000  
Ordinary shares, shares issued 13,677,357   13,446,007  
Ordinary shares, shares outstanding 13,641,325   13,409,975