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Stock incentive plan and stock-based compensation (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 7 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 6 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Nov. 12, 2013
Sep. 04, 2013
Sep. 30, 2013
Aug. 16, 2013
May 02, 2013
Aug. 15, 2014
Apr. 15, 2014
Jul. 01, 2014
Dec. 31, 2014
Dec. 31, 2013
Jun. 16, 2014
Apr. 14, 2015
Jan. 28, 2015
Apr. 26, 2013
Dec. 10, 2013
Mar. 26, 2014
Jan. 16, 2014
Jan. 08, 2014
Jan. 28, 2015
Sep. 09, 2014
May 20, 2013
May 31, 2013
Jun. 30, 2014
Sep. 27, 2013
Jan. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Stock-based compensation expense                 $ 449us-gaap_ShareBasedCompensation $ 2,965us-gaap_ShareBasedCompensation                              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           62,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized 39,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized 62,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized 415,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized                                
Percentage Of Stockholder Incentive Stock Option Granted On Date Of Grant                 10.00%mgt_PercentageOfStockholderIncentiveStockOptionGrantedOnDateOfGrant                                
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized                 101us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized 187us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term                 7 months 28 days                                
Common stock, par value (in dollars per share)                 $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare                              
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period     6,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod                                            
Payments to Acquire Businesses, Gross         203us-gaap_PaymentsToAcquireBusinessesGross       600us-gaap_PaymentsToAcquireBusinessesGross 0us-gaap_PaymentsToAcquireBusinessesGross                              
Stock Issued During Period, Shares, Issued for Services   16,611us-gaap_StockIssuedDuringPeriodSharesIssuedForServices   30,000us-gaap_StockIssuedDuringPeriodSharesIssuedForServices                                          
Stock Issued During Period, Value, Issued for Services   72us-gaap_StockIssuedDuringPeriodValueIssuedForServices   6us-gaap_StockIssuedDuringPeriodValueIssuedForServices         159us-gaap_StockIssuedDuringPeriodValueIssuedForServices 1,709us-gaap_StockIssuedDuringPeriodValueIssuedForServices                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value           57us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 77us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 57us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1                                  
Common Stock, Shares, Issued                 10,731,160us-gaap_CommonStockSharesIssued 8,848,686us-gaap_CommonStockSharesIssued                              
Common Stock, Value, Issued                 11us-gaap_CommonStockValue 9us-gaap_CommonStockValue                              
Proceeds from Warrant Exercises                 0us-gaap_ProceedsFromWarrantExercises 3,197us-gaap_ProceedsFromWarrantExercises                              
Cash Consideration Payable upon execution of Consulting Agreement 25mgt_CashConsiderationPayableUponExecutionOfConsultingAgreement                                                
Common Stock issuable upon execution of Consulting Agreement 10,000mgt_CommonStockIssuableUponExecutionOfConsultingAgreement                                                
Stock Issuance Costs 57mgt_StockIssuanceCosts                                                
Common Stock Shares Issued Upon Execution Of Consulting Agreement 20,000mgt_CommonStockSharesIssuedUponExecutionOfConsultingAgreement                                                
Proceeds from Issuance of Common Stock                 0us-gaap_ProceedsFromIssuanceOfCommonStock 100us-gaap_ProceedsFromIssuanceOfCommonStock                              
Common Stock Issued Upon Warrant Exercise                   236,730mgt_CommonStockIssuedUponWarrantExercise                              
Class of Warrant or Right, Exercise Price of Warrants or Rights                 $ 4.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1         $ 3.85us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1                      
Settlement Agreement [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Common Stock Issuable Upon Execution Of Agreement                     75,000mgt_CommonStockIssuableUponExecutionOfAgreement
/ mgt_AgreementAxis
= mgt_SettlementAgreementMember		                            
Settlement Agreement, Common stock fair value                                             49mgt_SettlementAgreementCommonStockFairValue
/ mgt_AgreementAxis
= mgt_SettlementAgreementMember		    
Consulting Agreement [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Cash Consideration Payable upon execution of Consulting Agreement 20mgt_CashConsiderationPayableUponExecutionOfConsultingAgreement
/ mgt_AgreementAxis
= mgt_ConsultingAgreementMember		                                                
Common Stock issuable upon execution of Consulting Agreement 10,000mgt_CommonStockIssuableUponExecutionOfConsultingAgreement
/ mgt_AgreementAxis
= mgt_ConsultingAgreementMember		                                                
Subsequent Event [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Restricted Stock Shares Granted                         30,000mgt_RestrictedStockSharesGranted
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		           30,000mgt_RestrictedStockSharesGranted
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		            
Stock Issued During Period, Shares, Issued for Services                 72,699us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value                         16us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                        
Proceeds from Issuance of Common Stock                       2,949us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                          
Warrant [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Common Stock Purchase Warrant Exercised                   357,204mgt_CommonStockPurchaseWarrantExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		                              
Common Stock Purchase Warrant Exercise Price                   $ 3.00mgt_CommonStockPurchaseWarrantExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		                              
Conversion Of Warrants To Cashless Shares                   210,529mgt_ConversionOfWarrantsToCashlessShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		                              
Conversion Of Warrants Exercised                   146,675mgt_ConversionOfWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		                              
Issuance Of Common Stock For Cancellation Of Warrants                 1,431,486mgt_IssuanceOfCommonStockForCancellationOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		                                
Share Based Compensation Arrangement By Share Based Payment Award Warrants Exercised                 0mgt_ShareBasedCompensationArrangementByShareBasedPaymentAwardWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		 3,117,928mgt_ShareBasedCompensationArrangementByShareBasedPaymentAwardWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		       715,742mgt_ShareBasedCompensationArrangementByShareBasedPaymentAwardWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		                      
Proceeds from Warrant Exercises                           2,757us-gaap_ProceedsFromWarrantExercises
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		                      
Conversion Of Warrants To Common Stock Value                   440mgt_ConversionOfWarrantsToCommonStockValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		                              
Stock Issued During Period, Shares, New Issues                 894,683us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		                                
Class of Warrant or Right, Exercise Price of Warrants or Rights                 $ 3.85us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		                                
Warrant Modification Agreement [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Common stock, par value (in dollars per share)                             $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementEquityComponentsAxis
= mgt_WarrantModificationAgreementMember		                    
Common Stock Purchase Warrant Exercise Price                             $ 1.50mgt_CommonStockPurchaseWarrantExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= mgt_WarrantModificationAgreementMember		                    
Warrants To Purchase Common Stock, Shares                             613,496mgt_WarrantsToPurchaseCommonStockShares
/ us-gaap_StatementEquityComponentsAxis
= mgt_WarrantModificationAgreementMember		                    
Proceeds From Issuance Of Warrants Gross                             920mgt_ProceedsFromIssuanceOfWarrantsGross
/ us-gaap_StatementEquityComponentsAxis
= mgt_WarrantModificationAgreementMember		                    
Common Stock Purchase Warrant Reduced Exercise Price                             $ 1.50mgt_CommonStockPurchaseWarrantReducedExercisePrice
/ us-gaap_StatementEquityComponentsAxis
= mgt_WarrantModificationAgreementMember		                    
Minimum Sale Price For Warrants                             $ 2.50mgt_MinimumSalePriceForWarrants
/ us-gaap_StatementEquityComponentsAxis
= mgt_WarrantModificationAgreementMember		                    
Placement Fee For Solicitation Of Exercise Of Warrants, Percentage                             8.00%mgt_PlacementFeeForSolicitationOfExerciseOfWarrantsPercentage
/ us-gaap_StatementEquityComponentsAxis
= mgt_WarrantModificationAgreementMember		                    
Placement Fee For Solicitation Of Exercise Of Warrants, Amount                             73mgt_PlacementFeeForSolicitationOfExerciseOfWarrantsAmount
/ us-gaap_StatementEquityComponentsAxis
= mgt_WarrantModificationAgreementMember		                    
Legal Fees Reimbursed                             9mgt_LegalFeesReimbursed
/ us-gaap_StatementEquityComponentsAxis
= mgt_WarrantModificationAgreementMember		                    
Proceeds from Issuance of Warrants                             838us-gaap_ProceedsFromIssuanceOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= mgt_WarrantModificationAgreementMember		                    
Class of Warrant or Right, Exercise Price of Warrants or Rights                             $ 3.85us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= mgt_WarrantModificationAgreementMember		                    
Stock Incentive Plan 2012 [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                                               1,335,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= mgt_StockIncentivePlan2012Member		  
Amended And Restated Plan [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                                               415,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= mgt_AmendedAndRestatedPlanMember		  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized     920,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= mgt_AmendedAndRestatedPlanMember		                                            
Restricted Stock [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period                 147,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 6,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		           46,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 46,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 46,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		              
Stock Issued During Period, Value, Restricted Stock Award, Gross                               91us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 91us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 91us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		              
Restricted Stock [Member] | Subsequent Event [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Restricted Stock Shares Granted                         25,000mgt_RestrictedStockSharesGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		           25,000mgt_RestrictedStockSharesGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		            
Restricted Stock Shares Issued                                                 10,000mgt_RestrictedStockSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value                                     13us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		            
Non Employee [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Stock-based compensation expense                 911us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= mgt_NonEmployeeMember		 1,709us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= mgt_NonEmployeeMember		                              
Issuance Of Fair Market Value Over Vesting Period                   20,000mgt_IssuanceOfFairMarketValueOverVestingPeriod
/ us-gaap_AwardTypeAxis
= mgt_NonEmployeeMember		                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value                   66us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= mgt_NonEmployeeMember		                              
Common Stock, Shares, Issued                 270,000us-gaap_CommonStockSharesIssued
/ us-gaap_AwardTypeAxis
= mgt_NonEmployeeMember		                                
Common Stock, Value, Issued                 1,011us-gaap_CommonStockValue
/ us-gaap_AwardTypeAxis
= mgt_NonEmployeeMember		                                
Proceeds from Issuance of Common Stock                 100us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_AwardTypeAxis
= mgt_NonEmployeeMember		                                
Non Employee [Member] | Subsequent Event [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Stock Issued During Period, Shares, Issued for Services                 103,607us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_AwardTypeAxis
= mgt_NonEmployeeMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                
Common Stock, Value, Issued                 62us-gaap_CommonStockValue
/ us-gaap_AwardTypeAxis
= mgt_NonEmployeeMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                
Employee [Member] | Director [Member] | General and Administrative Expense [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Stock-based compensation expense                 290us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= mgt_EmployeeMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		 1,357us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= mgt_EmployeeMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		                              
FanTD LLC [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Stock Issued During Period Shares For Consulting And Marketing Agreement                                           100,000mgt_StockIssuedDuringPeriodSharesForConsultingAndMarketingAgreement
/ dei_LegalEntityAxis
= mgt_FantdLlcMember		      
Business Acquisition, Percentage of Voting Interests Acquired                 16.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ dei_LegalEntityAxis
= mgt_FantdLlcMember		                     16.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ dei_LegalEntityAxis
= mgt_FantdLlcMember		 63.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ dei_LegalEntityAxis
= mgt_FantdLlcMember		        
Payments to Acquire Businesses, Gross                 $ 4us-gaap_PaymentsToAcquireBusinessesGross
/ dei_LegalEntityAxis
= mgt_FantdLlcMember		                     $ 7us-gaap_PaymentsToAcquireBusinessesGross
/ dei_LegalEntityAxis
= mgt_FantdLlcMember		 $ 3,018us-gaap_PaymentsToAcquireBusinessesGross
/ dei_LegalEntityAxis
= mgt_FantdLlcMember		 $ 503us-gaap_PaymentsToAcquireBusinessesGross
/ dei_LegalEntityAxis
= mgt_FantdLlcMember		      
Common Stock, Shares, Issued                                         600,000us-gaap_CommonStockSharesIssued
/ dei_LegalEntityAxis
= mgt_FantdLlcMember		        
FanTD LLC [Member] | MGT acquisition [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Business Acquisition, Percentage of Voting Interests Acquired                                         63.12%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ mgt_AgreementAxis
= mgt_MgtAcquisitionMember
/ dei_LegalEntityAxis
= mgt_FantdLlcMember