Annual report pursuant to Section 13 and 15(d)

Net Loss Per Common Share (Details)

v2.4.1.9
Net Loss Per Common Share (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Basic and diluted net loss per common share calculation:    
Net loss $ (49,700,875)us-gaap_NetIncomeLoss $ (23,251,435)us-gaap_NetIncomeLoss
Accretion of redeemable convertible preferred stock (28,521)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment (333,710)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
Net loss attributable to common stockholders $ (49,729,396)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (23,585,145)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average common shares outstanding 24,655,603us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 793,806us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Net loss per share of common stock-basic and diluted $ (2.02)us-gaap_EarningsPerShareBasicAndDiluted $ (29.71)us-gaap_EarningsPerShareBasicAndDiluted
Outstanding securities excluded from computation of diluted weighted shares outstanding as they would have been anti dilutive:    
Outstanding securities excluded from computation of diluted weighted shares outstanding (in shares) 3,604,708us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 18,703,728us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Redeemable convertible preferred stock    
Outstanding securities excluded from computation of diluted weighted shares outstanding as they would have been anti dilutive:    
Outstanding securities excluded from computation of diluted weighted shares outstanding (in shares)   15,707,986us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
Stock options    
Outstanding securities excluded from computation of diluted weighted shares outstanding as they would have been anti dilutive:    
Outstanding securities excluded from computation of diluted weighted shares outstanding (in shares) 3,574,450us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
2,795,746us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
Warrants    
Outstanding securities excluded from computation of diluted weighted shares outstanding as they would have been anti dilutive:    
Outstanding securities excluded from computation of diluted weighted shares outstanding (in shares) 30,258us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
199,996us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember