Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 31, 2015
Document And Entity Information [Abstract]
Trading symbol	EBIO
Entity registrant name	Eleven Biotherapeutics, Inc.
Entity central index key	0001485003
Current fiscal year end date	--12-31
Entity filer category	Non-accelerated Filer
Document type	10-Q
Document period end date	Jun. 30, 2015
Document fiscal year focus	2015
Document fiscal period focus	Q2
Amendment flag	false
Entity common stock, shares outstanding		19,379,285