Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Total Equity Attributable to MGT Stockholders [Member]	Non-controlling Interest [Member]	Total
Balance at Dec. 31, 2017	$ 59	$ 390,736	$ (378,900)	$ 11,895	$ (22)	$ 11,873
Balance, shares at Dec. 31, 2017	58,963,009
Stock-based compensation	$ 1	1,086		1,087		1,087
Stock-based compensation, shares	850,000
Stock issued for services	$ 1	838		839		839
Stock issued for services, shares	448,551
Stock issued for prior year notes payable conversion	$ 3	(3)
Stock issued for prior year notes payable conversion, shares	3,381,816
Stock sold in connection with private placements		80		80		80
Stock sold in connection with private placements,shares	200,000
Exercise of warrants	$ 2	279		281		281
Exercise of warrants, shares	2,224,250
Stock issued in disposition of cyber security assets		120		120		120
Stock issued in disposition of cyber security assets, shares	60,000
Warrant modification expense		139		139		139
Deemed dividend		2,514	(2,514)
Net loss			(4,549)	(4,549)		(4,549)
Balance at Mar. 31, 2018	$ 66	$ 395,789	$ (385,963)	$ 9,892	$ (22)	$ 9,870
Balance, shares at Mar. 31, 2018	66,127,626