Stockholders' Equity (Deficiency) - Summary of Employees' Stock Options Activities (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 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	214,650
Exercised, Number	(10,875)
Forfeited, Number	(8,752)
Options outstanding at the end of the period, Number	3,428,258	3,233,235
Vested and expected to vest, Number	3,378,232
Options exercisable at the end of the period, Number	2,581,849
Options outstanding at the beginning of the year, Average exercise price	$ 4.033
Granted, Average exercise price	$ 39.860
Exercised, Average exercise price	$ 1.282
Forfeited, Average exercise price	$ 12.845
Options outstanding at the end of the year, Average exercise price	$ 6.264	$ 4.033
Vested and expected to vest, Average exercise price	$ 6.034
Options exercisable at the end of the year, Average exercise price	$ 1.582
Options outstanding at the beginning of the year, Aggregate intrinsic value	$ 65,723
Options outstanding at the end of the year, Aggregate intrinsic value	102,001	65,723
Vested and expected to vest, Aggregate intrinsic value	101,244
Options exercisable at the end of the year, Aggregate intrinsic value	$ 88,242
Options outstanding, Average remaining contractual life	5 years 8 months 23 days	5 years 8 months 12 days
Vested and expected to vest, Average remaining contractual life	5 years 8 months 3 days
Options exercisable at the end of the year, Average remaining contractual life	4 years 7 months 7 days