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Stockholders' Equity - Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Options outstanding at December 31, 2012 9,184,346 8,346,190
Options granted 1,119,200  
Options exercised (1,715,123)  
Options canceled (182,559)  
Options outstanding at December 31, 2013 8,405,864 9,184,346
Options vested and expected to vest at December 31, 2013 8,046,932  
Options exercisable at December 31, 2013 5,800,931  
Options outstanding, Weighted-Average Exercise per Share Price, Beginning Balance $ 6.21  
Options granted, Weighted-Average Exercise per Share Price $ 11.75  
Options exercised, Weighted-Average Exercise per Share Price $ 4.74  
Options canceled, Weighted-Average Exercise per Share Price $ 8.50  
Options outstanding, Weighted-Average Exercise per Share Price, Ending Balance $ 7.20 $ 6.21
Options vested and expected to vest at December 31, 2013, Weighted-Average Exercise Per Share Price $ 7.10  
Options exercisable at December 31, 2013, Weighted-Average Exercise per Share Price $ 6.84  
Options outstanding, Weighted Average Remaining Contractual Term 6 years 3 months 4 days 6 years 5 months 16 days
Options vested and expected to vest at December, 31, 2013, Weighted Average Remaining Contractual Term 6 years 1 month 13 days  
Options exercisable at December, 31, 2013, Weighted Average Remaining Contractual Term 5 years 18 days  
Options outstanding, Aggregate Intrinsic Value $ 56,425  
Options vested and expected to vest at December 31, 2013, Aggregate Intrinsic Value 54,849  
Options exercisable at December 31, 2013, Aggregate Intrinsic Value $ 41,073