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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, 2014
Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Options outstanding at December 31, 2013 8,405,864us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 9,184,346us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options granted 1,694,400us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
Options exercised (1,959,201)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Options canceled (134,683)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod  
Options outstanding at December 31, 2014 8,006,380us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 9,184,346us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options vested and expected to vest at December 31, 2014 7,526,430us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber  
Options exercisable at December 31, 2014 4,929,932us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Options outstanding, Weighted-Average Exercise per Share Price, Beginning Balance $ 7.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Options granted, Weighted-Average Exercise per Share Price $ 14.19us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice  
Options exercised, Weighted-Average Exercise per Share Price $ 6.17us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice  
Options canceled, Weighted-Average Exercise per Share Price $ 8.77us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice  
Options outstanding, Weighted-Average Exercise per Share Price, Ending Balance $ 8.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Options vested and expected to vest at December 31, 2013, Weighted-Average Exercise Per Share Price $ 8.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice  
Options exercisable at December 31, 2013, Weighted-Average Exercise per Share Price $ 7.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice  
Options outstanding, Weighted Average Remaining Contractual Term, Beginning 6 years 7 months 13 days  
Options outstanding, Weighted Average Remaining Contractual Term, Ending 6 years 7 months 13 days  
Options vested and expected to vest at December, 31, 2014, Weighted Average Remaining Contractual Term 6 years 5 months 9 days  
Options exercisable at December, 31, 2014, Weighted Average Remaining Contractual Term 5 years 26 days  
Options outstanding, Aggregate Intrinsic Value $ 50,766us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue  
Options vested and expected to vest at December 31, 2014, Aggregate Intrinsic Value 49,437us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue  
Options exercisable at December 31, 2014, Aggregate Intrinsic Value $ 39,475us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1