Share Capital - Schedule of Stock Options to Purchase Ordinary Shares (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares
Number of options
Number of options, Outstanding at beginning of year | shares	11,377,354
Number of options, Granted | shares	5,381,613
Number of options, Exercised | shares	(1,442,522)
Number of options, Forfeited and cancelled | shares	(510,418)
Number of options, Outstanding at ending of year | shares	14,806,027
Number of options, Exercisable options | shares	6,389,813
Weighted average exercise price
Weighted average exercise price, Outstanding at beginning of year | $ / shares	$ 9.76
Weighted average exercise price, Granted | $ / shares	10.53
Weighted average exercise price, Exercised | $ / shares	2.64
Weighted average exercise price, Forfeited and cancelled | $ / shares	12.54
Weighted average exercise price, Outstanding at end of year | $ / shares	10.64
Weighted average exercise price, Exercisable options | $ / shares	$ 8.64
Aggregate intrinsic value
Aggregate intrinsic value, Outstanding at end of year | $	$ 145,755
Aggregate intrinsic value, Exercisable options | $	$ 75,547