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Summary of Information Regarding Option Activity (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Options Outstanding    
Options outstanding at December 31, 2013 1,610,988us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 2,315,090us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Granted 420,698us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod  
Exercised (700,738)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Forfeited/cancelled (105,831)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod  
Options outstanding at December 31, 2014 1,225,117us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 2,315,090us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options exercisable at December 31, 2014 412,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Vested and expected to vest at December 31, 2014 723,010us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber [1]  
Weighted-Average Exercise Price Per Share    
Options outstanding at December 31, 2013 $ 5.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 4.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Granted $ 13.98us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice  
Exercised $ 4.41us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice  
Forfeited/cancelled $ 7.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice  
Options outstanding at December 31, 2014 $ 8.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 4.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options exercisable at December 31, 2014 $ 4.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice  
Vested and expected to vest at December 31, 2014 $ 10.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice [1]  
Weighted-Average Remaining Contractual Term (in years)    
Options outstanding at December 31, 2014 7 years 3 months 18 days  
Options exercisable at December 31, 2014 4 years 9 months  
Vested and expected to vest at December 31, 2014 8 years 7 months 21 days [1]  
Aggregate Intrinsic Value    
Options outstanding at December 31, 2014 $ 14,261,197us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue  
Options exercisable at December 31, 2014 6,391,377us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1  
Vested and expected to vest at December 31, 2014 $ 6,969,962us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue [1]  
[1] This represents the number of vested options as of December 31, 2014 plus the number of unvested options expected to vest as of December 31, 2014 based on the unvested outstanding options at December 31, 2014 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.