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

Equity (Details 2)

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Equity (Details 2) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of range of exercise prices of outstanding share options [line items]        
Number of outstanding options 40,644,792 32,888,472 45,532,659 17,963,346
Weighted average of the remaining contractual life 6 years 9 months 11 days 7 years 8 months 19 days 8 years 3 months 11 days  
Bottom of range [Member]        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price range $ 0.26 $ 0.26 $ 0.26  
Top of range [Member]        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price range $ 1.39 $ 1.39 $ 1.39