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Share Based Payment (Details 1) - Share options [Member] - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Number of options, Outstanding at beginning of year 4,055,260 2,384,909 1,099,240
Number of options, Granted 900,048 2,194,648 1,444,164
Number of options, Exercised (179,257) (159,648) (4,235)
Number of options, Forfeited (955,356) (351,810) (78,734)
Number of options, Expired (348,148) (12,839) (75,526)
Number of options, Outstanding at end of year 3,472,547 4,055,260 2,384,909
Number of options, Exercisable at end of year 1,879,377 1,552,660 1,061,645
Average exercise price, Outstanding at beginning of year $ 1.26 $ 0.84 $ 0.49
Average exercise price, Granted 0.46 1.7 1.07
Average exercise price, Exercised 0.57 0.51 0.4
Average exercise price, Forfeited 1.23 1.52 0.51
Average exercise price, Expired 1.13 1.12 0.46
Average exercise price, Outstanding at end of year 1.11 1.26 0.84
Average exercise price per, Exercisable at end of year $ 0.89 $ 0.74 $ 0.55