Document And Entity Information	9 Months Ended
	Sep. 30, 2013	Nov. 14, 2013
Document Information [Line Items]
Entity Registrant Name	MGT CAPITAL INVESTMENTS INC
Entity Central Index Key	0001001601
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Trading Symbol	MGT
Entity Common Stock, Shares Outstanding		7,605,100
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2013
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2013