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Net Loss per Share - Potentially Dilutive Securities Excluded from Calculation of Diluted Weighted Average Shares Outstanding (Detail)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total potentially dilutive securities 2,812us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,829us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Common Stock Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total potentially dilutive securities 2,812us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
1,829us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember