Stockholders' Equity (Deficiency) - Summary of Employees' Stock Options Activities (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding at the beginning of the year, Number	3,233,235
Granted, Number	516,940
Exercised, Number	(12,594)
Forfeited, Number	(21,929)
Options outstanding at the end of the period, Number	3,715,652	3,233,235
Vested and expected to vest, Number	3,634,396
Options exercisable at the end of the period, Number	2,682,549
Options outstanding at the beginning of the year, Average exercise price	$ 4.033
Granted, Average exercise price	$ 29.422
Exercised, Average exercise price	$ 1.985
Forfeited, Average exercise price	$ 17.290
Options outstanding at the end of the year, Average exercise price	$ 7.493	$ 4.033
Vested and expected to vest, Average exercise price	$ 7.148
Options exercisable at the end of the year, Average exercise price	$ 1.948
Options outstanding at the beginning of the year, Aggregate intrinsic value	$ 65,723
Options outstanding at the end of the year, Aggregate intrinsic value	82,249	65,723
Vested and expected to vest, Aggregate intrinsic value	81,560
Options exercisable at the end of the year, Aggregate intrinsic value	$ 72,596
Options outstanding, Average remaining contractual life	5 years 9 months 27 days	5 years 8 months 12 days
Vested and expected to vest, Average remaining contractual life	5 years 8 months 29 days
Options exercisable at the end of the year, Average remaining contractual life	4 years 6 months 3 days