Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Potential Dilutive Securities Excluded from the Computation of Dilutive Weighted Average Shares Outstanding (Detail)

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Significant Accounting Policies - Potential Dilutive Securities Excluded from the Computation of Dilutive Weighted Average Shares Outstanding (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Preferred stock 17,266,668us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 2,503,928us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Warrant [Member]    
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Preferred stock 13,709,977us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
329,617us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
Stock Options [Member]    
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Preferred stock 3,556,691us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
528,154us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
Preferred Stock [Member]    
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Preferred stock   1,646,157us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember