Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Financial Instruments (Details 4)

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Financial Instruments (Details 4) - NIS [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Gain (loss) from the change on financial instruments:    
Increase of 10% in exchange rate [1] $ 437 $ 1,427
Decrease of 10% in exchange rate [1] (437) (1,427)
Gain (loss) from the change:    
Increase of 10% in market price [1] (1,020) (1,539)
Decrease of 10% in market price [1] $ 981 $ 1,472
[1] According to binomial model a 10% increase in the market price of listed securities will increase the price of warrants exercisable into shares by approximately 15% and a 10% decrease in the market price of listed securities will decrease the price of warrants exercisable into shares by approximately 15%.