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Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Shares [Rollforward]        
Balance at Beginning of Period 1,626,606 1,146,046 641,261  
Granted 439,929 714,345 636,580  
Exercised (217,069) (86,588) (6,072)  
Forfeited (73,978) (118,026) (50,782)  
Cancelled (28,779) (29,171) (74,941)  
Balance at End of Period 1,746,709 1,626,606 1,146,046 641,261
Exercisable at December 31, 2013 977,351      
Options vested and expected to vest as of December 31, 2013 1,746,709      
Weighted Average Exercise Price [Roll Forward]        
Balance at Beginning of Period $ 14.90 $ 14.61 $ 21.36  
Granted $ 23.61 $ 14.72 $ 9.98  
Exercised $ 14.60 $ 11.31 $ 9.51  
Forfeited $ 16.72 $ 11.39 $ 11.95  
Cancelled $ 29.87 $ 24.16 $ 34.55  
Balance at End of Period $ 16.79 $ 14.90 $ 14.61 $ 21.36
Exercisable at December 31, 2013 $ 15.69      
Options vested and expected to vest as of December 31, 2013 $ 16.79      
Weighted Average Remaining Contractual Term in Years 7 years 6 months 26 days 7 years 9 months 29 days 7 years 11 months 16 days 7 years
Exercisable, Weighted Average Remaining Contractual Term in Years 6 years 10 months 13 days      
Options vested and expected to vest, Weighted Average Remaining Contractual Term in Years 7 years 6 months 26 days      
Aggregate Intrinsic Value $ 62,705 $ 11,358 $ 1,489 $ 9
Exercisable, Aggregate Intrinsic Value 36,232      
Options vested and expected to vest, Aggregate Intrinsic Value $ 62,705