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CONSOLIDATED BALANCE SHEETS (Parenthetical) - ₪ / shares
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Ordinary shares, par value per share ₪ 0.01 ₪ 0.01
Ordinary shares, shares authorized 100,000,000 100,000,000
Ordinary shares, shares issued 51,293,070 51,131,534
Ordinary shares, shares outstanding 51,293,070 51,131,534