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Asset purchases and acquisitions of businesses (Details 1) (Digital Angel [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Business Acquisition [Line Items]  
Net assets acquired $ 339mgt_BusinessAcquistionPurchasePriceAllocationAssetsAcquired
Trademarks [Member]
  
Business Acquisition [Line Items]  
Net assets acquired 6mgt_BusinessAcquistionPurchasePriceAllocationAssetsAcquired
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
/ dei_LegalEntityAxis
= mgt_DigitalAngelMember
Software and hardware [Member]
  
Business Acquisition [Line Items]  
Net assets acquired 28mgt_BusinessAcquistionPurchasePriceAllocationAssetsAcquired
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= mgt_SoftwareAndHardwareMember
/ dei_LegalEntityAxis
= mgt_DigitalAngelMember
Intangible Mobile Gaming [Member]
  
Business Acquisition [Line Items]  
Net assets acquired $ 305mgt_BusinessAcquistionPurchasePriceAllocationAssetsAcquired
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= mgt_IntangibleMobileGamingMember
/ dei_LegalEntityAxis
= mgt_DigitalAngelMember