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Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating activities      
Net loss $ (34,156)us-gaap_NetIncomeLoss $ (18,025)us-gaap_NetIncomeLoss $ (19,657)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 410us-gaap_DepreciationAndAmortization 438us-gaap_DepreciationAndAmortization 448us-gaap_DepreciationAndAmortization
Non-cash interest expense 36us-gaap_PaidInKindInterest 36us-gaap_PaidInKindInterest 47us-gaap_PaidInKindInterest
Stock-based compensation expense 2,432us-gaap_ShareBasedCompensation 1,260us-gaap_ShareBasedCompensation 130us-gaap_ShareBasedCompensation
Change in fair value of warrant liability 123us-gaap_FairValueAdjustmentOfWarrants 150us-gaap_FairValueAdjustmentOfWarrants 24us-gaap_FairValueAdjustmentOfWarrants
Change in fair value of convertible notes payable, included in interest expense   991us-gaap_InterestExpenseDebt  
Loss on extinguishment of debt 459us-gaap_GainsLossesOnExtinguishmentOfDebt    
Expense related to issuance costs allocated to warrants measured at fair value 276us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims    
Changes in operating assets and liabilities:      
Prepaid expenses and other assets (259)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 167us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 39us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Restricted cash   40us-gaap_IncreaseDecreaseInRestrictedCashForOperatingActivities  
Accounts payable 1,021us-gaap_IncreaseDecreaseInAccountsPayable (211)us-gaap_IncreaseDecreaseInAccountsPayable 50us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses 1,315us-gaap_IncreaseDecreaseInAccruedLiabilities 190us-gaap_IncreaseDecreaseInAccruedLiabilities (173)us-gaap_IncreaseDecreaseInAccruedLiabilities
Deferred revenue (964)us-gaap_IncreaseDecreaseInDeferredRevenue 1,470us-gaap_IncreaseDecreaseInDeferredRevenue  
Net cash used in operating activities (29,307)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (13,494)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (19,092)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing activities      
Purchases of property and equipment (137)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment   (110)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities (137)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations   (110)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing activities      
Proceeds from issuance of convertible notes payable   3,500us-gaap_ProceedsFromConvertibleDebt  
Proceeds from issuance of notes payable, net of debt issuance costs 9,883us-gaap_ProceedsFromNotesPayable 3,000us-gaap_ProceedsFromNotesPayable 1,947us-gaap_ProceedsFromNotesPayable
Payments on equipment financing and notes payable (4,633)us-gaap_RepaymentsOfNotesPayable (511)us-gaap_RepaymentsOfNotesPayable (955)us-gaap_RepaymentsOfNotesPayable
Proceeds from issuance of common stock and common stock warrants, net of issuance costs 70,237us-gaap_ProceedsFromIssuanceOfCommonStock    
Repurchase of unvested restricted stock     (5)us-gaap_PaymentsForRepurchaseOfCommonStock
Proceeds from exercise of common stock options and common stock warrants 74us-gaap_ProceedsFromStockOptionsExercised 31us-gaap_ProceedsFromStockOptionsExercised 6us-gaap_ProceedsFromStockOptionsExercised
Deferred initial public offering costs   (1,303)us-gaap_PaymentsOfStockIssuanceCosts  
Net cash provided by financing activities 75,561us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 13,554us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 26,384us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase in cash and cash equivalents 46,117us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 60us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 7,182us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 7,942us-gaap_CashAndCashEquivalentsAtCarryingValue 7,882us-gaap_CashAndCashEquivalentsAtCarryingValue 700us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 54,059us-gaap_CashAndCashEquivalentsAtCarryingValue 7,942us-gaap_CashAndCashEquivalentsAtCarryingValue 7,882us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental non-cash financing activities      
Conversion of Series A and Series B preferred stock into 8,260,444 shares of common stock 56,678ebio_ConversionOfPreferredStockIntoCommonStock    
Conversion of preferred stock warrants into common stock warrants 247ebio_ConversionOfPreferredStockWarrantToCommonStocksWarrants    
Issuance of warrants for common stock 3,300ebio_IssuanceOfWarrantForCommonStock 1,685ebio_IssuanceOfWarrantForCommonStock 97ebio_IssuanceOfWarrantForCommonStock
Supplemental cash flow information      
Cash paid for interest 335us-gaap_InterestPaid 264us-gaap_InterestPaid 136us-gaap_InterestPaid
Series A Convertible Preferred Stock [Member]      
Financing activities      
Proceeds from issuance of convertible preferred stock, net of issuance costs     25,391us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Series B Convertible Preferred Stock [Member]      
Financing activities      
Proceeds from issuance of convertible preferred stock, net of issuance costs   8,837us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		  
Supplemental non-cash financing activities      
Conversion of notes payable and accrued interest thereon into Series B convertible preferred stock   $ 4,204us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember