CONSOLIDATED BALANCE SHEETS (Parenthetical)	Dec. 31, 2017 ₪ / shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 ₪ / shares	Dec. 31, 2016 USD ($) shares
Statement of Financial Position [Abstract]
Common stock, par value (in NIS per share) | ₪ / shares	₪ 0.0175		₪ 0.0175
Common stock, shares authorized (in shares)		200,000,000		200,000,000
Common stock, shares issued (in shares)		51,488,000		49,076,000
Common stock, shares outstanding (in shares)		51,488,000		49,076,000
Commitments and Contingencies (Note 9) | $