XML 41 R26.htm IDEA: XBRL DOCUMENT v2.4.1.9
Share-Based Payments - Additional Information (Detail) (USD $)
3 Months Ended 0 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jan. 01, 2015
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total intrinsic value of options vested and expected to vest $ 4,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue      
Total intrinsic value of options exercised 584,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 120,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue    
Total fair value of employee and director options vested 215,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 186,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1    
Expense related to the restricted stock granted to non-employees 0us-gaap_AllocatedShareBasedCompensationExpense 17,000us-gaap_AllocatedShareBasedCompensationExpense    
Unrecognized compensation expense 1,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions      
Stock options granted 566,556us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross      
Total unrecognized compensation cost related to non-vested stock options and unvested restricted stock 5,900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized      
Total unrecognized compensation cost related to non-vested stock options and unvested restricted stock, recognition period 3 years 11 days      
Non-Employee Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock, issued 1,300us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
/ us-gaap_AwardTypeAxis
= ebio_NonEmployeeRestrictedStockMember
0us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
/ us-gaap_AwardTypeAxis
= ebio_NonEmployeeRestrictedStockMember
   
Unvested stock, granted 1,083us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ebio_NonEmployeeRestrictedStockMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ebio_NonEmployeeRestrictedStockMember
   
Expense related to the restricted stock granted to non-employees 27,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ebio_NonEmployeeRestrictedStockMember
48,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ebio_NonEmployeeRestrictedStockMember
   
Employees and Directors Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expense related to the restricted stock granted to non-employees 554,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ebio_EmployeesAndDirectorsStockOptionsMember
288,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ebio_EmployeesAndDirectorsStockOptionsMember
   
Non-employee Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= ebio_NonEmployeeStockOptionsMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= ebio_NonEmployeeStockOptionsMember
   
Expense related to options granted to non-employees $ 83,000ebio_ShareBasedPaymentAwardArrangementCompensationExpenseRelatedToGrants
/ us-gaap_AwardTypeAxis
= ebio_NonEmployeeStockOptionsMember
$ 300,000ebio_ShareBasedPaymentAwardArrangementCompensationExpenseRelatedToGrants
/ us-gaap_AwardTypeAxis
= ebio_NonEmployeeStockOptionsMember
   
2009 Stock Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of fair value exercise price grant date of incentive stock options granted to 10% shareholder employees 110.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardDateAxis
= ebio_IncentivePlanTwoThousandNineMember
     
Award vesting period 4 years      
Expected term (in years) 10 years      
Stock incentive plan, reserved shares of common stock       1,347,821us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardDateAxis
= ebio_IncentivePlanTwoThousandNineMember
Stock incentive plan, shares remained available for future issuance       1,586us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardDateAxis
= ebio_IncentivePlanTwoThousandNineMember
2009 Stock Incentive Plan [Member] | Cliff for New Employee [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 1 year      
Stock Incentive Plan 2014 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock incentive plan, reserved shares of common stock       708,661us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardDateAxis
= ebio_StockIncentivePlanTwoThousandFourteenMember
Stock incentive plan, annual increase in reserved shares of common stock     722,331us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod
/ us-gaap_AwardDateAxis
= ebio_StockIncentivePlanTwoThousandFourteenMember
1,102,362us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod
/ us-gaap_AwardDateAxis
= ebio_StockIncentivePlanTwoThousandFourteenMember
Stock incentive plan, annual increase in reserved shares as percentage of outstanding common stock       4.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum
/ us-gaap_AwardDateAxis
= ebio_StockIncentivePlanTwoThousandFourteenMember