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Stock-Based Compensation - Schedule of Stock Options Outstanding (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Number of Shares, Exercisable 2,721,164us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Vested or expected to vest, Number of Shares 4,864,038us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
Exercisable, Weighted-Average Exercise Price $ 1.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Vested or expected to vest, Weighted-Average Exercise Price $ 2.38us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice
Weighted-Average Remaining Contractual Term, Exercisable 6 years 7 months 24 days
Weighted-Average Remaining Contractual Term, Vested or expected to vest 7 years 7 months 17 days