Fair Value of Financial Instruments - Additional Information (Detail)	3 Months Ended
Mar. 31, 2016 USD ($)
Fair Value Disclosures [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