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Restructuring - Restructuring Charges Recorded and Related Liability for Strategic Restructuring (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]  
Restructuring Expense $ 279,000us-gaap_RestructuringCharges
Non-cash Expense (38,000)us-gaap_RestructuringReserveSettledWithoutCash1
Employee Severance, Benefits and Related Cost [Member]  
Restructuring Cost and Reserve [Line Items]  
Restructuring Expense 279,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= ebio_EmployeeSeveranceAndRelatedBenefitsMember
Cash Payments (241,000)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= ebio_EmployeeSeveranceAndRelatedBenefitsMember
Non-cash Expense (38,000)us-gaap_RestructuringReserveSettledWithoutCash1
/ us-gaap_RestructuringCostAndReserveAxis
= ebio_EmployeeSeveranceAndRelatedBenefitsMember
Restructuring Liability at December 31, 2013 $ 0us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= ebio_EmployeeSeveranceAndRelatedBenefitsMember