Represents the number of shares exchanged in transfer of units.

No definition available.

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Namespace Prefix:	mgt_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the per share value of shares exchanged in transfer of units.

+ References

No definition available.

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Exchange Of Shares In Transfer Of Units, Value

+ References

No definition available.

+ Details

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Namespace Prefix:	mgt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents option to purchase company's ownership percentage.

+ References

No definition available.

+ Details

Name:	mgt_OptionToPurchaseOwnershipPercentage
Namespace Prefix:	mgt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_MinorityInterestLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
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- Details

Name:	dei_LegalEntityAxis=mgt_FantdToMgtSportsMember
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- Details

Name:	dei_LegalEntityAxis=mgt_GioiaSystemsLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
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- Details

Name:	dei_LegalEntityAxis=mgt_M2pEntertainmentMember
Namespace Prefix:
Data Type:	na
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Non-controlling interest (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended		12 Months Ended		0 Months Ended	1 Months Ended
	Sep. 09, 2014	May 02, 2013	Dec. 31, 2014	Dec. 31, 2013	Feb. 10, 2014	May 20, 2013	May 31, 2013	Sep. 03, 2013	Dec. 04, 2013
Noncontrolling Interest [Line Items]
Payments to Acquire Businesses, Gross		$ 203	$ 600	$ 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	885
FanTD LLC [Member]
Noncontrolling Interest [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	16.00%		16.00%			63.00%
Payments to Acquire Businesses, Gross	7		4			3,018	503
Exchange Of Shares In Transfer Of Units, Value					266
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			79
MGT Interactive [Member]
Noncontrolling Interest [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired								51.00%
M2P Americas [Member]
Noncontrolling Interest [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired									50.10%
Gioia Systems, LLC [Member]
Noncontrolling Interest [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired								49.00%
M2P Entertainment [Member]
Noncontrolling Interest [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired									49.90%
FanTD to MGT Sports [Member]
Noncontrolling Interest [Line Items]
Option To Purchase Ownership Percentage					5.00%
Exchange Of Shares In Transfer Of Units					52,500
Exchange Of Shares In Transfer Of Units, Value					$ 103
Exchange Of Shares In Transfer Of Units, Per Share Value					$ 1.96