Non-controlling interest (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net loss attributable to MGT	$ (890)	$ (1,202)	$ (2,386)	$ (4,144)
Transfers (to) from the non-controlling interest:
Increase in MGTs paid-in capital from sale and assignment of Medicsight Stock			0	21
Increase in MGTs paid-in capital from Medicsight Share Consolidation			2,392	0
Increase in MGTs paid-in capital from repurchase of Medicsight Shares			1,973	0
Changes from the net loss attributable to MGT and transfers from non-controlling interest			$ 1,979	$ (4,123)