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Stockholders' Equity (Deficiency) - Options Outstanding Separated into Range of Exercise Price (Detail) (USD $)
 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options outstanding 3,936,971 3,233,235
Options outstanding, Weighted average remaining contractual life 5 years 11 months 21 days  
Options outstanding, Weighted average exercise price $ 8.647 $ 4.033
Options exercisable 2,674,799  
Options exercisable, Weighted average remaining contractual life 4 years 5 months 4 days  
Options exercisable, Weighted average exercise price $ 2.284  
$0.070-0.901 [Member]
    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise price, Lower limit $ 0.070  
Range of exercise price, Upper limit $ 0.901  
Options outstanding 693,467  
Options outstanding, Weighted average remaining contractual life 2 years 8 months 6 days  
Options outstanding, Weighted average exercise price $ 0.752  
Options exercisable 693,467  
Options exercisable, Weighted average remaining contractual life 2 years 8 months 6 days  
Options exercisable, Weighted average exercise price $ 0.752  
$1.039-1.576 [Member]
    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise price, Lower limit $ 1.039  
Range of exercise price, Upper limit $ 1.576  
Options outstanding 1,669,345  
Options outstanding, Weighted average remaining contractual life 4 years 5 months 29 days  
Options outstanding, Weighted average exercise price $ 1.260  
Options exercisable 1,665,478  
Options exercisable, Weighted average remaining contractual life 4 years 5 months 27 days  
Options exercisable, Weighted average exercise price $ 1.259  
$6.230-8.800 [Member]
    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise price, Lower limit $ 6.230  
Range of exercise price, Upper limit $ 8.800  
Options outstanding 174,596  
Options outstanding, Weighted average remaining contractual life 7 years 1 month 20 days  
Options outstanding, Weighted average exercise price $ 6.723  
Options exercisable 125,290  
Options exercisable, Weighted average remaining contractual life 7 years 23 days  
Options exercisable, Weighted average exercise price $ 6.756  
$12.470 [Member]
    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise price, Upper limit $ 12.470  
Options outstanding 415,711  
Options outstanding, Weighted average remaining contractual life 8 years 5 months 3 days  
Options outstanding, Weighted average exercise price $ 12.470  
Options exercisable 159,613  
Options exercisable, Weighted average remaining contractual life 8 years 4 months 24 days  
Options exercisable, Weighted average exercise price $ 12.470  
$21.14-24.23 [Member]
    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise price, Lower limit $ 21.140  
Range of exercise price, Upper limit $ 24.230  
Options outstanding 774,902  
Options outstanding, Weighted average remaining contractual life 9 years 7 months 1 day  
Options outstanding, Weighted average exercise price $ 21.591  
Options exercisable 30,951  
Options exercisable, Weighted average remaining contractual life 8 years 11 months 13 days  
Options exercisable, Weighted average exercise price $ 21.131  
$39.86 [Member]
    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise price, Upper limit $ 39.860  
Options outstanding 208,950  
Options outstanding, Weighted average remaining contractual life 9 years 5 months 23 days  
Options outstanding, Weighted average exercise price $ 39.860