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Loss Per Share of Common Stock (Details)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Loss per share of common stock    
Antidilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares) 1,478,662us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 9,133,126us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Convertible preferred stock.    
Loss per share of common stock    
Antidilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)   7,596,927us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertiblePreferredStockMember
Warrants    
Loss per share of common stock    
Antidilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)   470,026us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
Stock options    
Loss per share of common stock    
Antidilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares) 1,478,662us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember		 1,066,173us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember