Organization and Basis of Presentation (Details Narrative) - USD ($) $ in Thousands				1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 04, 2019	Apr. 12, 2019	Mar. 22, 2019	Mar. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 27, 2019
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Common stock, shares authorized							2,500,000,000	2,500,000,000		125,000,000
Common stock shares outstanding							413,701,289	111,079,683
Sale of stock, number of shares issued in transaction	52,000,000
Proceeds from sale of common stock	$ 1,754						$ 525	$ 80
Description on Cryptocurrency mining						The Company took delivery of an additional 2,000 Bitcoin mining machines in Sweden and moved 4,300 machines (including 2,100 investor-owned machines) from Washington to Sweden.	Following a review of its Bitcoin mining operations in early 2019, the Company determined to consolidate its activities in Company-owned and managed facilities. Central to this strategy was the purchase of land in LaFayette, GA and the entry into a favorable contract for electricity in the second quarter of 2019. Located adjacent to a utility substation, the several acre property has access to over 20 megawatts (MW) of low-cost power. The Company began Bitcoin mining at its LaFayette facility in late September 2019 on a trial basis, and on January 31, 2020, the Company announced it is operating 1,500 new generation Bitcoin miners collectively rated at approximately 80 Ph/s at the facility. All miners were purchased from Bitmaintech Pte. Ltd., a Singapore limited company ("Bitmain"). The total electrical load at this production level is estimated at slightly under 4.0 MW. The Company's miners are housed in five modified shipping containers including two manufactured by Bit5ive LLC of Miami, Florida ("Pod5ive Containers"). As an early investor and design consultant, the Company receives a modest royalty participation in all sales of Pod5ive Containers. Phase I of the LaFayette site is structurally complete and awaiting final grading and landscaping. The entire facility, including the land, five 2500 KVA 3-phase transformers, the mining containers and the miners, are owned by MGT. As the Company is presently using only one-third of the available electrical load, it is exploring ways to grow its current operations.
Restructuring expense					$ 2,499			2,499
Costs to bring electricity provider current and set up additional transformers					893
Additional operating costs					256
Hosting service fees			$ 77
Sale of asset in consideration				$ 60
Percentage of assets sold convertible into equity interest		9.99%		20.00%
Loss on sale of cybersecurity assets				$ 127				(127)
Proceeds from sale of cybersecurity assets				60				$ 60
Less assets sold				27
Payment for former management				40
Common stock issued to former management				120
Promissory Note [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Sale of asset in consideration				$ 1,000
Service Providers [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Restructuring expense					1,350
Vendors [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Restructuring expense					$ 1,149
Hosting Agreement [Member] | Beacon Leasing LLC [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Fixed price of electricity capacity per month									$ 810
Paid to electricity charges first and last month of services									$ 1,620
Maximum [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Common stock shares outstanding	76,558,643