Document and Entity Information	3 Months Ended
	Mar. 31, 2015	May 01, 2015
Document and Entity Information
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2015
Entity Registrant Name	HEMISPHERX BIOPHARMA INC
Entity Central Index Key	0000946644
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding (shares)		232,558,832