Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2015
Debt Instrument Fair Value Carrying Value [Abstract]
Transfers of assets or liabilities	$ 0

Fair Value Assets Liabilities Transfer Between Levels

No definition available.

Name:	ebio_FairValueAssetsLiabilitiesTransferBetweenLevels
Namespace Prefix:	ebio_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration