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Stock-Based Compensation - Schedule of Stock Option Activity (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]    
Shares, Outstanding, Beginning Balance 3,200,958  
Shares, Granted 279,894  
Shares, Exercised (307,204)  
Shares, Forfeited or expired (44,698)  
Shares, Outstanding, Ending Balance 3,128,950 3,200,958
Shares, Exercisable 1,756,293  
Shares, Vested and expected to vest 2,955,117  
Weighted- Average Exercise Price, Outstanding, Beginning Balance $ 4.90  
Weighted- Average Exercise Price, Granted $ 20.72  
Weighted- Average Exercise Price, Exercised $ 1.41  
Weighted- Average Exercise Price, Forfeited or expired $ 7.42  
Weighted- Average Exercise Price, Outstanding, Ending Balance $ 6.62 $ 4.90
Weighted- Average Exercise Price, Exercisable $ 2.45  
Weighted- Average Exercise Price, Vested and expected to vest $ 6.35  
Weighted- Average Remaining Contractual Term, Outstanding 6 years 8 months 12 days 6 years 10 months 24 days
Weighted- Average Remaining Contractual Term, Exercisable 5 years  
Weighted- Average Remaining Contractual Term, Vested and expected to vest 6 years 6 months  
Aggregate Intrinsic Value, Outstanding, Ending Balance $ 46,144  
Aggregate Intrinsic Value, Exercisable 32,646  
Aggregate Intrinsic Value, Vested and expected to vest $ 44,305