Document And Entity Information	6 Months Ended
	Jun. 30, 2013	Aug. 13, 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		6,353,846
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2013