Organization and Basis of Presentation (Details Narrative) - USD ($) $ in Thousands					3 Months Ended				9 Months Ended		12 Months Ended
	Jun. 13, 2018	Mar. 23, 2018	Mar. 19, 2018	Mar. 16, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	May 16, 2018
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Common stock, shares authorized		75,000,000			125,000,000				125,000,000		125,000,000
Common stock reverse split		The Company's stockholders approved a 1-for-2 reverse split of the Company's common stock, to be effected only if needed for the Company's application to uplist its common stock to a national exchange.
Universal shelf registration statement amount	$ 150,000
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.		During the nine months ended September 30, 2018, the Company mined 230.7 Bitcoin for total revenue of $1,934. In addition, the miners the Company operates pursuant to the management agreements mined 183.6 Bitcoin during the same period.
Customer deposits					$ 947				$ 947			$ 368
Restructuring expense						$ 2,499			2,499
Revenue on mining									1,934
Sale of asset in consideration			$ 60	$ 60					$ 60
Percentage of assets sold convertible into equity interest			20.00%
Promissory Note [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Sale of asset in consideration			$ 1,000	$ 1,000
Percentage of assets sold convertible into equity interest				20.00%
Quincy [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Description on Cryptocurrency mining									MGT owned and operated approximately 500 miners located in a leased facility in Quincy, Washington. The Company also owns 4,200 miners which are in the process of being moved to a leased facility in Colorado. In addition, the Company operates about 2,100 miners pursuant to management agreements, which are also in the process of being moved to the leased facility in Colorado. All miners owned or managed by MGT are S9 Antminers sold by Bitmain Technologies LTD. In addition to the S9 Antminers, the Company owns 50 custom designed GPU-based Ethereum mining rigs.
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