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Stockholders' Equity (Deficiency) - Summary of Employees' Stock Options Activities (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Options outstanding at the beginning of the year, Number 3,233,235  
Granted, Number 838,940  
Exercised, Number (94,674)  
Forfeited, Number (40,530)  
Options outstanding at the end of the period, Number 3,936,971 3,233,235
Vested and expected to vest, Number 3,839,163  
Options exercisable at the end of the period, Number 2,674,799  
Options outstanding at the beginning of the year, Average exercise price $ 4.033  
Granted, Average exercise price $ 26.189  
Exercised, Average exercise price $ 2.369  
Forfeited, Average exercise price $ 18.360  
Options outstanding at the end of the year, Average exercise price $ 8.647 $ 4.033
Vested and expected to vest, Average exercise price $ 8.287  
Options exercisable at the end of the year, Average exercise price $ 2.284  
Options outstanding at the beginning of the year, Aggregate intrinsic value $ 65,723  
Options outstanding at the end of the year, Aggregate intrinsic value 56,768 65,723
Vested and expected to vest, Aggregate intrinsic value 56,523  
Options exercisable at the end of the year, Aggregate intrinsic value $ 53,004  
Options outstanding, Average remaining contractual life 5 years 11 months 21 days 5 years 8 months 12 days
Vested and expected to vest, Average remaining contractual life 5 years 10 months 20 days  
Options exercisable at the end of the year, Average remaining contractual life 4 years 5 months 4 days