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Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Numerator:    
Net loss $ (13,472)us-gaap_NetIncomeLoss $ (4,458)us-gaap_NetIncomeLoss
Accretion of redeemable convertible preferred stock to redemption value   (49)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
Net loss attributable to common stockholders $ (13,472)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (4,507)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator:    
Weighted average common shares outstanding, basic and diluted 25,615,282us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 729,391us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Net loss per share attributable to common stockholders, basic and diluted $ (0.53)us-gaap_EarningsPerShareBasicAndDiluted $ (6.18)us-gaap_EarningsPerShareBasicAndDiluted