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Stock-Based Compensation - Schedule of Stock Option Activity (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]    
Shares, Outstanding, Beginning Balance 3,200,958  
Shares, Granted 236,294  
Shares, Exercised (267,573)  
Shares, Forfeited or expired (8,452)  
Shares, Outstanding, Ending Balance 3,161,227 3,200,958
Shares, Exercisable 1,669,697  
Shares, Vested and expected to vest 2,978,791  
Weighted- Average Exercise Price, Outstanding, Beginning Balance $ 4.90  
Weighted- Average Exercise Price, Granted $ 20.61  
Weighted- Average Exercise Price, Exercised $ 1.03  
Weighted- Average Exercise Price, Forfeited or expired $ 3.32  
Weighted- Average Exercise Price, Outstanding, Ending Balance $ 6.41 $ 4.90
Weighted- Average Exercise Price, Exercisable $ 2.02  
Weighted- Average Exercise Price, Vested and expected to vest $ 6.15  
Weighted- Average Remaining Contractual Term, Outstanding 6 years 10 months 24 days 6 years 10 months 24 days
Weighted- Average Remaining Contractual Term, Exercisable 5 years 1 month 6 days  
Weighted- Average Remaining Contractual Term, Vested and expected to vest 6 years 9 months 18 days  
Aggregate Intrinsic Value, Outstanding, Ending Balance $ 49,685  
Aggregate Intrinsic Value, Exercisable 33,026  
Aggregate Intrinsic Value, Vested and expected to vest $ 47,529