Name:	mgt_LiquidityAndFinancialConditionLineItems
Namespace Prefix:	mgt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the percentage on gross sales price will be paid as manager fee.

+ References

No definition available.

+ Details

Name:	mgt_ManagerFeePercentageOnGrossSalesPrice
Namespace Prefix:	mgt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

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

- Definition

Represents description for share issuance.

+ References

No definition available.

+ Details

Name:	mgt_SharesIssuanceDescription
Namespace Prefix:	mgt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Monetary value of common stock allocated to investors to buy shares of a new issue of common stock before they are offered to the public. When stock is sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the shares to the investor until it receives the entire proceeds.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6403732&loc=d3e21300-112643

+ Details

Name:	us-gaap_CommonStockSharesSubscriptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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

- Definition

Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

+ References

No definition available.

+ Details

Name:	us-gaap_RestrictedCashAndInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.31(a)(3))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_RetainedEarningsAccumulatedDeficit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Liquidity and financial condition (Details Textual) (USD $)	12 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Apr. 14, 2015
Liquidity And Financial Condition [Line Items]
Sale Of Stock Offering Price	$ 8,500,000mgt_SaleOfStockOfferingPrice
Retained Earnings (Accumulated Deficit)	(299,163,000)	(293,833,000)
Manager fee percentage on gross sales price	3.00%
Restricted Cash and Investments	1,455,000us-gaap_RestrictedCashAndInvestments
Shares Issuance Description	The Shares sold in the offering will be issued pursuant to the Companys effective shelf registration statement on Form S3 (File No. 333182298) previously filed with the Securities and Exchange Commission (the SEC) in accordance with the provisions of the Securities Act of 1933, as amended (the Securities Act), as supplemented by a prospectus supplement dated December 30, 2013 for the sale of up to $8.5 million of Shares, which the Company filed with the SEC pursuant to Rule 424(b)(5) under the Securities Act.
Proceeds From Issuance Of Common Stock	0	100,000
Subsequent Event [Member]
Liquidity And Financial Condition [Line Items]
Common Stock, Value, Subscriptions			5,600,000
Sale of Stock, Number of Shares Issued in Transaction			4,100,000
Proceeds From Issuance Of Common Stock			2,949,000
Mgt Gaming [Member]
Liquidity And Financial Condition [Line Items]
Restricted Cash and Investments	$ 11,000