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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Shares [Rollforward]    
Balance at Beginning of Period 1,800,697  
Granted 287,747  
Exercised (326,418)  
Forfeited (78,685)  
Balance at End of Period 1,683,341 1,800,697
Exercisable at December 31, 2015 1,193,288  
Options vested and expected to vest as of December 31, 2015 1,683,341  
Weighted Average Exercise Price [Roll Forward]    
Balance at Beginning of Period (in usd per share) $ 28.78  
Granted (in usd per share) 62.82  
Exercised (in usd per share) 26.55  
Forfeited (in usd per share) 45.75  
Balance at End of Period (in usd per share) 34.23 $ 28.78
Exercisable at December 31, 2014 (in usd per share) 25.41  
Options vested and expected to vest as of December 31, 2014 (in usd per share) $ 34.23  
Weighted Average Remaining Contractual Term in Years 6 years 7 months 28 days 7 years 3 months
Exercisable, Weighted Average Remaining Contractual Term in Years 5 years 11 months 23 days  
Options vested and expected to vest, Weighted Average Remaining Contractual Term in Years 6 years 7 months 28 days  
Aggregate Intrinsic Value $ 124,880 $ 51,558
Exercisable, Aggregate Intrinsic Value 99,061  
Options vested and expected to vest, Aggregate Intrinsic Value $ 124,880