Nature of Operations (Details) - Subject	3 Months Ended
Mar. 31, 2018	Mar. 28, 2018
Nature of Operations [Abstract]
Number of days of treatment received by subjects prior to pre-specified interim analysis	90 days
Number of subjects randomized and treated first in Phase 3 NEWTON 2 study of EG-1962		210

Period of time treatment was received by subjects in the Phase 3 NEWTON 2 study of EG-1962 in adults with aneurysmal subarachnoid hemorrhage prior to a pre-specified interim analysis, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	edge_TermOfTreatmentReceivedBySubjectsPriorToPreSpecifiedInterimAnalysis
Namespace Prefix:	edge_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration