Document and Entity Information [Abstract] Document and Entity Information [Abstract] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Trading Symbol Trading Symbol Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Statement Of Financial Position [Abstract] Statement of Financial Position [Abstract] Assets [Abstract] Assets Cash and Cash Equivalents, At Carrying Value Cash and cash equivalents Cash and cash equivalents Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Accounts Receivable, Net, Current Accounts receivable Accounts receivable Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Prepaid expenses and other current assets Inventory, Net Inventory, Net Inventories Assets, Current Total current assets Total current assets Property, Plant and Equipment, Net Property and equipment, at cost, net Property and equipment, at cost, net Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Deferred Finance Costs, Net Deferred financing costs, net Intangible Assets, Net (Excluding Goodwill) Intangible assets Intangible assets, net of accumulated amortization of $17 Security Deposit Security deposits Assets Total assets Total assets Liabilities [Abstract] Liabilities Accounts Payable, Current Accounts payable Accounts Payable, Current, Total Accrued Liabilities, Current Accrued expenses Accrued Liabilities, Current, Total Deferred Compensation Share-Based Arrangements, Liability, Current Accrued stock-based compensation Other Liabilities, Current Other payables Other payables Liabilities, Current Total current liabilities Total current liabilities Convertible Debt, Noncurrent Convertible note, net of discount of $957 Convertible notes Liabilities Total liabilities Total liabilities Stockholders Equity, Including Portion Attributable To Noncontrolling Interest [Abstract] Stockholders' deficit Preferred Stock, Value, Issued Preferred stock, $0.001 par value; 10,000,000 shares authorized; no shares issued and outstanding at June 30, 2012. Common Stock, Value, Issued Common stock, $0.001 par value; 75,000,000 shares authorized; 2,105,187 and 2,108,187 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively. Common Stock, Value, Issued, Total Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Ending Balance Additional Paid In Capital, Common Stock Additional paid in capital Additional Paid in Capital, Common Stock, Beginning Balance Additional Paid in Capital, Common Stock, Ending Balance Accumulated Other Comprehensive Income (Loss), Net Of Tax Accumulated other comprehensive loss Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Retained Earnings (Accumulated Deficit) Accumulated deficit Accumulated deficit Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Stockholders Equity Attributable To Parent Total stockholders' deficit Total stockholder's deficit BALANCE BALANCE Stockholders' Equity Attributable To Noncontrolling Interest Non-controlling interests Non-controlling interest Non-controlling interest at January 1, 2011 Non-controlling interest at June 30, 2012 Stockholders Equity, Including Portion Attributable To Noncontrolling Interest Total equity Total equity Balance Balance Liabilities and Equity Total stockholders' equity, liabilities and non-controlling interest Total stockholders' equity, liabilities and non-controlling interest Balance Sheet Parenthetical [Abstract] Balance Sheet Parenthetical [Abstract] Amount of Dunamis Capital loans receivable-related party by entity during the reporting period Finite Lived Intangible Assets Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Debt Instrument, Unamortized Discount Less: unamortized debt discount Less: unamortized debt discount Preferred Stock, Par Or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share (in dollars per share) Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Issued Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Common Stock, Par Or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Issued, Total Common Stock, Shares, Outstanding Common stock, shares outstanding Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares, Outstanding, Ending Balance Income Statement [Abstract] Income Statement [Abstract] Revenues [Abstract] Revenues Technology Services Revenue Software and devices Sales Revenue, Services, Other Services - consulting Revenues Software and devices Revenues Cost Of Revenue [Abstract] Cost of revenues Other Cost Of Services Services - consulting Technology Services Costs Software and devices Cost Of Revenue Cost of Revenue Cost of Revenue Gross Profit Gross profit Gross (loss)/profit Operating Expenses [Abstract] Operating expenses Selling, General and Administrative Expense Selling, general and administrative Selling, general and administrative Research and Development Expense Research and development Research and development cost Operating Expenses Operating Expenses, Total Operating Expenses, Total Operating Income (Loss) Operating loss Operating loss Other Nonoperating Income (Expense) [Abstract] Other non-operating income/(expense) Interest and Other Non Operating Income Expense Interest and other (expense)/income The aggregate amount of interest and other income/expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Amortization Of Financing Costs and Discounts Amortization of debt discount and deferred financing costs Amortization of debt discount and deferred financing costs Amortization of debt discount and deferred financing costs Gain On Sale Of Moneygate Gain on sale of Moneygate The net amount of the gain received on sale of moneygate during the period. Other Nonoperating Income (Expense) Other (expense)/income Other (expense)/income Other Nonoperating Income (Expense) Income (Loss) From Continuing Operations Before Income Taxes, Extraordinary Items, Noncontrolling Interest Net loss before income taxes and non-controlling interest Net loss before income taxes and non-controlling interest Net loss before income taxes and non-controlling interest Income Tax Expense (Benefit) Income tax benefit Income tax benefit Income tax benefit Net Income (Loss), Including Portion Attributable To Noncontrolling Interest Net loss for the period Net loss before non-controlling interest Net loss before non-controlling interest Net loss as reported Net Income (Loss) Attributable To Noncontrolling Interest Net loss attributable to non-controlling interest Non-controlling share of losses Net loss before non-controlling interest Net loss attributable to non-controlling interest Net loss before non-controlling interest Net Income (Loss) Attributable To Parent Net loss as reported Net loss attributable to MGT Capital Investments, Inc. Net loss as reported Net loss attributable to MGT Capital Investments, Inc. Other Comprehensive Income (Loss), Net Of Tax [Abstract] Other comprehensive loss Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Before Tax Translation adjustment Unrealized foreign exchange (loss)/gain Comprehensive Income (Loss), Net Of Tax, Including Portion Attributable To Noncontrolling Interest Comprehensive loss Comprehensive loss Comprehensive loss Comprehensive Income (Loss), Net Of Tax, Attributable To Noncontrolling Interest Comprehensive loss attributable to non-controlling interest Comprehensive loss attributable to non-controlling interest Comprehensive loss attributable to non-controlling interest Comprehensive Income (Loss), Net Of Tax, Attributable To Parent Comprehensive loss attributable to MGT Capital Investments, Inc. Comprehensive loss attributable to MGT Capital Investments, Inc. Earnings Per Share [Abstract] Per share data: Earnings Per Share, Basic and Diluted Basic and diluted loss per share (in dollars per share) Basic and diluted loss per share Weighted Average Number Of Common Shares Outstanding Basic and Diluted Weighted average number of common shares outstanding (in shares) Weighted average number of common shares outstanding The average number of shares or units issued and outstanding that are used in calculating basic and diluted EPS. Statement Of Stockholders Equity [Abstract] Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Statement, Equity Components [Axis] Preferred Stock [Member] Common Stock [Member] Additional Paid-In Capital [Member] Accumulated Other Comprehensive Income (Loss) [Member] Retained Earnings [Member] Parent [Member] Noncontrolling Interest [Member] Shares, Outstanding Balance (in shares) Balance (in shares) Adjustments To Additional Paid In Capital Reverse Stock Split Cash in lieu of fractional shares for MGT reverse/ forward split Aggregate adjustment to additional paid in capital for stock to account for a reverse stock split during the period. Stock Issued During Period Shares Reverse Stock Splits Cash in lieu of fractional shares for MGT reverse/ forward split (in shares) Noncontrolling Interest, Decrease From Redemptions Or Purchase Of Interests Acquisition of subsidiary shares from non-controlling interest Fair Value Of Intangible Asset Contributed By Non Controlling Interest Intangible asset contributed by non-controlling interest Non-controlling Share of MGT Gaming, Inc Fair value of intangible asset contributed by non-controlling interest. Fair value of intangible asset contributed by non-controlling interest Non-controlling share of capital Stock Option Compensation Stock-based compensation Non-controlling share of stock-based expense Adjustments To Additional Paid In Capital Warrant Issued In Connection With Acquisition Of Intangible Assets Warrants issued in connection with acquisition of intangible assets Warrants issued in connection with acquisition of intangible assets AdjustmentsToAdditionalPaidInCapitalWarrantIssuedInConnectionWithAcquisitionOfIntangibleAssets Fair value of warrants issued Adjustments To Additional Paid In Capital Warrant Issued In Connection With Issuance Of Convertible Note Warrants issued in connection with issuance of convertible note Warrants issued in connection with issuance of convertible note, net of issuance costs of $100 Adjustments To Additional Paid In Capital Warrant Issued In Connection With Issuance Of Convertible Note Fair value of warrants recorded as corresponding debt discount Adjustments To Additional Paid In Capital, Convertible Debt With Conversion Feature Beneficial conversion feature on convertible note Statement Of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Net Cash Provided By (Used In) Operating Activities [Abstract] Cash flows from operating activities: Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Depreciation Depreciation Depreciation Amortization Of Intangible Assets Amortization of intangible assets Amortization Of Convertible Note Discount Amortization of convertible note discount Amortization of convertible note discount It Represent Amortization Of Convertible Note Discount Amortization Of Financing Costs Amortization of deferred financing costs Amortization of deferred financing costs Share-Based Compensation Stock-based compensation expense Stock-based compensation expense Stock-based compensation expense Gain (Loss) On Sale Of Property Plant Equipment Loss on disposal of property and equipment Loss on disposal of property and equipment Assignment Of Medicsights Stock Assignment of Medicsight's stock It represents assignment of medicsight's stock. Gain On Sale Of Loan Receivable Related Party Gain on sale of loan receivable - related party The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market or other obligation to a related party. Gain on sale of loan receivable - related party Increase (Decrease) In Operating Assets [Abstract] (Increase)/decrease in assets Increase (Decrease) In Accounts Receivable Accounts receivable Accounts receivable Increase (Decrease) In Other Receivable Related Party Other receivables - related party Change in carrying value during the period of obligations incurred through and payable within one year (or in the operating cycle if longer) to a related party. Other receivables - related party Increase (Decrease) In Security Deposits Proceeds from release of security deposits Increase (Decrease) In Prepaid Expense and Other Assets Prepaid expenses and other current assets Prepaid expenses and other current assets Prepaid expenses and other current assets Increase (Decrease) In Inventories Inventory Inventory Increase (Decrease) In Operating Liabilities [Abstract] Increase/(decrease) in liabilities Increase (Decrease) In Accounts Payable Accounts payable Accounts payable Accounts payable Increase (Decrease) In Accrued Liabilities Accrued expenses Accrued expenses Accrued expenses Increase (Decrease) In Other Current Liabilities Other payables Other payables Other payables Net Cash Provided By (Used In) Operating Activities Net cash used in operating activities Net cash used in operating activities Net cash used in operating activities Net cash used in operating activities Net Cash Provided By (Used In) Investing Activities [Abstract] Cash flows from investing activities: Payments To Acquire Property, Plant, and Equipment Purchase of property and equipment Purchase of property, plant and equipment Purchase of property and equipment Purchase of property, plant and equipment Intangible Assets Purchased Purchase of intangible asset It represent Purchase of intangible asset. Repayments Of Related Party Debt Repayment of Dunamis loan Repayment of Dunamis loan Proceeds From Sale Of Equity Method Investments Receipts from sale of Moneygate Proceeds From Sale Of Equity Method Investments Receipts Of Deferred Consideration For Sale Of Assets From Discontinued Operation Receipts of deferred consideration for sale of assets The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. Receipts From Sale Of Medicsights Stock Receipts from sale of Medicsight's stock Receipts from sale of Medicsight's stock It represents the receipts from sale of medicsight's stock. Net Cash Provided By (Used In) Investing Activities Net cash provided by/(used in) investing activities Net cash (used in)/provided by investing activities Net Cash Provided By (Used In) Financing Activities [Abstract] Cash flows from financing activities: Payments For Reverse Or Forward Stock Split Cash paid in lieu of fractional shares in reverse/forward split The outflow of cash paid in lieu of fractional shares reverse (or) forward split during the reporting period. Cash paid in lieu of fractional shares in reverse/forward split Proceeds From Issuance Of Convertible Note Proceeds from issuance of convertible note Proceeds from issuance of convertible note It represent Proceeds from issuance of convertible note Proceeds from issuance of convertible note Payments For Convertible Note Issuance Costs Payments for convertible note issuance costs It represent Payments for convertible note issuance costs Net Cash Provided By (Used In) Financing Activities Net cash flows used in financing activities Net cash provided by financing activities Effect Of Exchange Rate On Cash and Cash Equivalents Effects of exchange rates on cash and cash equivalents Effects of exchange rates on cash and cash equivalents Effects of exchange rates on cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Net change in cash and cash equivalents Net change in cash and cash equivalents Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Supplemental non-cash disclosures (investing and financing activities): Debt Conversion, Converted Instrument, Amount Stock issued for services in connection with issuance of convertible note Debt Instrument, Convertible, Beneficial Conversion Feature Beneficial conversion on convertible note Beneficial conversion feature on convertible note Organization, Consolidation and Presentation Of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation Of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Accounting Policies [Abstract] Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Significant Accounting Policies [Text Block] Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Cash and Cash Equivalents [Abstract] Cash and Cash Equivalents [Abstract] Cash and Cash Equivalents Disclosure [Text Block] Cash and Cash Equivalents Disclosure [Text Block] Loans Receivable Related Party [Abstract] Loans Receivable Related Party [Abstract] Loans Receivable Related Party [Text Block] Loans Receivable Related Party [Text Block] The entire disclosure for loans receivable due from related parties. Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Inventory Disclosure [Text Block] Inventory Disclosure [Text Block] Intellectual Property [Abstract] Intellectual Property [Abstract] Intellectual Property [Text Block] the disclosure refers refers to creations of the mind: inventions, literary and artistic works, and symbols, names, images, and designs. Intellectual Property [Text Block] Line Of Credit Facility [Abstract] Line of Credit Facility [Abstract] Schedule Of Line Of Credit Facilities [Table Text Block] Line of credit facility [Text Block] Warrants and Rights Note Disclosure [Abstract] Warrants and Rights Note Disclosure [Abstract] Schedule Of Stockholders' Equity Note, Warrants Or Rights [Table Text Block] Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Noncontrolling Interest Disclosure [Text Block] Noncontrolling Interest Disclosure [Text Block] Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure Of Compensation Related Costs, Share-Based Payments [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Interst and Other Income Or Expense [Abstract] Interst and Other Income Or Expense [Abstract] Interst and Other Income Or Expense [Text Block] Interst and Other Income Or Expense [Text Block] The entire disclosure for interest and other interest income (or) expense during the reporting period. Related Party Transactions [Abstract] Related Party Transactions [Abstract] Related Party Transactions Disclosure [Text Block] Related Party Transactions [Text Block] Operating Leases Commitments and Security Deposit [Abstract] Operating Leases Commitments and Security Deposit [Abstract] Operating Leases Commitments and Security Deposit [Text Block] Operating leases, commitments and security deposit [Text Block] The entire disclosure for operating leases, commitments and security deposit. Segment Reporting [Abstract] Segment Reporting [Abstract] Segment Reporting Disclosure [Text Block] Segment Reporting Disclosure [Text Block] Schedule Of Finite-Lived Intangible Assets [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table Text Block] Senior Secured Convertible Note [Table Text Block] The entire disclosure about Senior Secured Convertible Note. Senior Secured Convertible Note [Table Text Block] Activity Of Convertible Note [Table Text Block] The entire disclosure about Activity Of Convertible Note Table Text Block. Activity Of Convertible Note [Table Text Block] Schedule Of Stockholders Equity [Table Text Block] Schedule of Stockholders Equity [Table Text Block] Consolidation, Less Than Wholly Owned Subsidiary, Parent Ownership Interest, Effects Of Changes, Net [Table Text Block] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table Text Block] Plan Name [Axis] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] All Option Plans [Member] Medicsight Plan J [Member] Schedule Of Share-Based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule Of Employee Service Share-Based Compensation, Allocation Of Recognized Period Costs [Table Text Block] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Interest and Other Income [Table Text Block] Interest and Other Income [Table Text Block] Schedule Of Future Minimum Rental Payments For Operating Leases [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Senior Secured Convertible Debt Non Current Senior secured convertible note Senior Secured Convertible Debt Non current Proceeds From Convertible Debt Proceeds from issuance of convertible notes payable Amortization Of Debt Discount (Premium) Amortization of debt discount Interest Expense Interest expense Debt Instrument, Convertible, Effective Interest Rate Debt Instrument, Convertible, Effective Interest Rate Debt Conversion, Converted Instrument, Shares Issued Debt Conversion, Converted Instrument, Shares Issued Debt Instrument, Convertible, Conversion Price Debt Instrument, Convertible, Conversion Price Debt Conversion, Converted Instrument, Warrants Or Options Issued Debt Conversion, Converted Instrument, Warrants or Options Issued Debt Instrument, Convertible, Terms Of Conversion Feature Debt Instrument, Convertible, Terms of Conversion Feature Percentage Of Conversion Amount To Be Redeemed Percentage Of Conversion Amount To Be Redeemed Percentage Of Conversion Amount To Be Redeemed Debt Instrument Convertible Terms Of Conversion Feature Warrants DebtInstrumentConvertibleTermsOfConversionFeatureWarrants Debt Instrument Convertible Terms Of Conversion Feature Warrants Maximum Common Stock Issuable In Satisfaction Of Interest Due Maximum Common Stock Issuable In Satisfaction Of Interest Due Maximum Common Stock Issuable In Satisfaction Of Interest Due Maximum Common Stock Issuable Pursuant To Note and Warrant Maximum Common Stock Issuable Pursuant To Note And Warrant Maximum Common Stock Issuable Pursuant To Note and Warrant Issuable Of Common Stock For Investment Banking Services Issuable of Common Stock For Investment Banking Services Issuable Of Common Stock For Investment Banking Services Financing and Issuance Costs Financing And Issuance Costs Financing and Issuance Costs Issuance Of Restricted Common Stock Issuance of Restricted Common stock Issuance Of Restricted Common Stock Restricted Common Stock Fair Market Value Restricted Common Stock Fair Market Value Restricted Common Stock Fair Market Value Deferred Financing Costs Deferred Financing Costs Deferred Financing Costs Warrant Issuance Costs Warrant Issuance Costs Warrant Issuance Costs Finite-Lived Intangible Assets, Amortization Expense, Remainder Of Fiscal Year Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Fair Value Assumptions, Expected Volatility Rate Fair Value Assumptions, Expected Volatility Rate Fair Value Assumptions, Expected Term Fair Value Assumptions, Expected Term Fair Value Assumptions, Risk Free Interest Rate Fair Value Assumptions, Risk Free Interest Rate Fair Value Assumptions, Expected Dividend Rate Fair Value Assumptions, Expected Dividend Rate Maximum Trading Shares Per Day Maximum Trading Shares Per Day Maximum Trading Shares Per Day Maximum Issuable Shares Under Note and Warrants Maximum Issuable Shares Under Note And Warrants Maximum Issuable Shares Under Note and Warrants Maximum Percentage Of Stock Options Discounted Maximum Percentage Of Stock Options Discounted Maximum Percentage Of Stock Options Discounted Warrants Issued Fair Value Warrants Issued Fair Value Warrants Issued Fair Value Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Medicsights [Member] Mgt [Member] Common Stock Par Value At Exchange Ratio Common Stock Par Value At Exchange Ratio Par value of common stock at an exchange ratio as of the reporting date. Stockholders' Equity, Reverse Stock Split Stockholders' Equity, Reverse Stock Split Stockholders Equity, Forward Stock Split Stockholders Equity, Forward Stock Split Description of the forward stock split arrangement. Number Of Shares Holding By Stockholders, Result Of Reverse Stock Split Number Of Shares Holding By Stockholders, Result Of Reverse Stock Split Number of shares holding by stockholders as a result of reversal stock split. Par Value Per Share Of Existing Ordinary Shares Par Value Per Share Of Existing Ordinary Shares Par value of per share of existing ordinary shares. Par Value Per Share Of New Ordinary Shares Par Value Per Share Of New Ordinary Shares Par value of per share of new ordinary shares. Number Of Shares Holding By Parent Result Of Reverse Stock Split Number Of Shares Holding By Parent Result Of Reverse Stock Split Shares Holding By Parent Result Of Reverse Stock Split Percentage Of Number Of Shares Holding By Parent Result Of Issued Share Capital Percentage Of Number Of Shares Holding By Parent Result Of Issued Share Capital Percentage Of Number Of Shares. Antidilutive Securities Excluded From Computation Of Earnings Per Share, By Antidilutive Securities [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock Options [Member] Antidilutive Securities Excluded From Computation Of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Stock Options Weighted Average Price Per Share Stock Options Weighted Average Price Per Share Weighted price per share of stock options during the period. Amortization Description description of amortization. Amortization Description Amortization Amortization Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Finite-Lived Intangible Assets, Amortization Expense, Year Two Finite-Lived Intangible Assets, Amortization Expense, Year Two Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Assets, Amortization Expense, Year Four Finite-Lived Intangible Assets, Amortization Expense, Year Four Finite-Lived Intangible Assets, Amortization Expense, Year Five Finite-Lived Intangible Assets, Amortization Expense, Year Five Proceeds From Sale Of Convertable Notes It represent the value of Proceeds From Sale Of Convertable Notes Proceeds From Sale Of Convertable Notes Related Party Transactions, By Related Party [Axis] Related Party Transactions, by Related Party [Axis] Related Party [Domain] Related Party [Domain] Moneygate Group [Member] Proceeds From Sale Of Stock and Various Noncore Investments For Consideration Proceeds From Sale Of Stock and Various Noncore Investments For Consideration Proceeds From Sale Of Stock and Various Noncore Investments Proceeds From Divestiture Of Interest In Subsidiaries and Affiliates Proceeds from Divestiture of Interest in Subsidiaries and Affiliates Equity Method Investment, Ownership Percentage Equity Method Investment, Ownership Percentage Gain (Loss) On Sale Of Equity Investments Gain (Loss) on Sale of Equity Investments Cash, Fdic Insured Amount Cash, FDIC Insured Amount Cash, Uninsured Amount Cash, Uninsured Amount Dunamis Capital [Member] Due From Related Parties, Current Due from Related Parties, Current Interest Receivable, Current Interest Receivable, Current Proceeds From Related Party Debt Proceeds from Related Party Debt Interest and Fee Income, Loans and Leases Interest and Fee Income, Loans and Leases Payment To Acquire Intellactual Property Cash paid to acquire intellactual property. Cash Patents Fair Value Disclosure Estimated Fair value of patents Total Issuance Of Warrants [Axis] Issuance Of Warrants [Axis] Issuance Of Warrants [Domain] Issuance Of Warrants [Domain] Black Scholes Pricing [Member] Patent Transfer Description It represent patents transfer description. Patent Transfer Description Derivative Financial Instruments, Liabilities, Fair Value Disclosure Derivative Financial Instruments, Liabilities, Fair Value Disclosure Stock Issued Warrants Fair Value It represents the fair value of warrnts issued. Stock Issued Warrants Fair Value Fair Value Assumptions, Exercise Price Fair Value Assumptions, Exercise Price Percentage For Consideration Of Patent PercentageForConsiderationOfPatent Percentage For Consideration Of Patent Percentage For Consideration Of Patent By Non Controlling Interests Percentage For Consideration Of Patent By Non Controlling Interests Percentage For Consideration Of Patent By Non Controlling Interests Consideration Of Patent By Non Controlling Interests Value Consideration Of Patent By Non Controlling Interests Value Consideration Of Patent By Non Controlling Interests Value Issuance Of Warrants In Anticipation Issuance Of Warrants In Anticipation Issuance Of Warrants In Anticipation Laddcap Value Partners Iii Llc [Member] Line Of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Line Of Credit Facility, Commitment Fee Percentage Line of Credit Facility, Commitment Fee Percentage Line Of Credit Facility, Interest Rate At Period End Line of Credit Facility, Interest Rate at Period End Line Of Credit Facility, Accrued Commitment Fee Line Of Credit Facility, Accrued Commitment Fee Amount of line of credit accrued commitment fee. Line Of Credit Facility, Expenses Line Of Credit Facility, Expenses Amount of line of credit facility expenses. Percentage Of Beneficial Owned Percentage Of Beneficial Owned Percentage of beneficial owned during the period. Mgt Gaming [Member] Non-Controlling Interest Share Of Other Comprehensive Income Non-controlling share of other comprehensive loss Decrease In Non-Controlling Interest From Share Consolidation Of Medicsight'S Stock Share consolidation of Medicsight's stock Increase In Assignment Of Stock Increase in MGT's paid in capital from sale and assignment of Medicsight's stock It represents Increase in MGT's paid in capital from sale and assignment of Medicsight's stock Consolidation, Less Than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net Increase in MGT's paid in capital from Medicsight Share Consolidation Consolidation, Less Than Wholly Owned Subsidiary, Parent Ownership Interest, Change Due To Net Income Attributable To Parent and Effects Of Changes, Net Changes from the net loss attributable to MGT Capital Investments, Inc. and transfers from non-controlling interest Changes from the net loss attributable to MGT Capital Investments, Inc. and transfers from non-controlling interest Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number Number of Outstanding options Number of Shares,Outstanding at December 31, 2011 Number of Shares,Outstanding at June 30, 2012 Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Net Of Forfeitures Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Number of Shares,Granted Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period Number of Shares,Exercised Exercised Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Forfeitures and Expirations In Period Number of Shares,Forfeited/ Cancelled Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Exercisable options Average exercise price Weighted-Average Exercise Price,Outstanding at December 31, 2011 Weighted-Average Exercise Price,Outstanding at June 30, 2012 Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsforfeituresandcancelledinperiodweightedaverageexerciseprice Weighted-Average Exercise Price,Forfeited/ Cancelled Sharebasedcompensationarrangementbysharebasedpaymentawardoptionsforfeituresandcancelled. Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercisable, Number Number of Exercisable options Number of shares Exercisable at December 31, 2011 Number of shares Exercisable at June 30, 2012 Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Outstanding options Average exercise price Weighted-Average Exercise Price, Exercisable at December 31, 2011 Weighted-Average Exercise Price, Exercisable at June 30, 2012 Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Outstanding options Remaining contractual life (years) Schedule Of Employee Service Share-Based Compensation, Allocation Of Recognized Period Costs, By Report Line [Axis] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Employee Service Share-Based Compensation, Allocation Of Recognized Period Costs, Report Line [Domain] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Selling, General and Administrative Expenses [Member] Research and Development Expense [Member] Award Type [Axis] Award Type [Axis] Restricted Stock [Member] Former Director [Member] Deferred Bonus and Profit Sharing Plan By Title Of Individual [Axis] Deferred Bonus and Profit Sharing Plan by Title of Individual [Axis] Title Of Individual With Relationship To Entity [Domain] Title of Individual with Relationship to Entity [Domain] Each Current Independent Director Of Board [Member] Officers and Certain Employees [Member] Equity Component [Domain] Equity Component [Domain] Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Percentage Of Stockholder Incentive Stock Option Granted On Date Of Grant Percentage of Stockholder Incentive Stock Option Granted On Date Of Grant Percentage Of Stockholder Incentive Stock Option Granted On Date Of Grant Share Based Compensation Arrangement By Share Based Payment Restricted Shares Approved To Grant Of Grant Share Based Compensation Arrangement By Share Based Payment Restricted Shares Approved to Grant Share Based Compensation Arrangement By Share Based Payment Restricted Shares Approved To Grant Of Grant Share Based Compensation Arrangement By Share Based Payment Restricted Shares Issued Share Based Compensation Arrangement By Share Based Payment Restricted Shares Issued Share Based Compensation Arrangement By Share Based Payment Restricted Shares Issued Common Stock, Capital Shares Reserved For Future Issuance Common Stock, Capital Shares Reserved for Future Issuance Employee Service Share-Based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Employee Service Share-Based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized, Period For Recognition Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Interest Income (Expense) Nonoperating Interest (expense)/income The amount of non-operating interest income (expense). Other Income Expense Non Operating Other (expense)/income The aggregate amount of other income/expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income/expense recognized for the period. Nonoperating Income (Expense) Interest and other (expense)/income Total, other operating (expense)/income Total Total, other operating (expense)/income D4D Limited [Member] Provided Loan Facilities For Working Capital Provided Loan Facilities For Working Capital Amount of provided loan facilities for working capital. Provided Loan Facilities For Acquisitions Provided Loan Facilities For Acquisitions Amount of provided loan facilities for acquisitions. Percentage Of Owned By Related Party Percentage Of Owned By Related Party Percentage owned by related party. Line Of Credit Facility, Interest Rate During Period Line of Credit Facility, Interest Rate During Period Payments Of Service Agreement Payments of Stock Issuance Costs The cash outflow for cost incurred directly with the service agreement. Operating Leases, Future Minimum Payments Due, Current 2012 (remaining six months) Operating Leases, Future Minimum Payments, Due In Two Years 2013 Operating Leases, Future Minimum Payments, Due In Three Years 2014 Operating Leases, Future Minimum Payments Due Total Total Operating Leases, Property Rent, Services and Related Costs Operating Leases, Property Rent, Services and Related Costs Operating lease amount of property rent, services and related costs. Operating Leases, Monthlty Rental Payments Operating Leases, Monthlty Rental Payments Amount of operating leases monthly rental payments. Operating Leases, Rental Deposit Operating Leases, Rental Deposit Amount of operating leases rental deposit. Operating Leases Rental Deposit Refunded Operating Leases Rental Deposit Refunded Amount of operating leases rental deposit refunded. Operating Leases, Rent Expense Operating Leases, Rent Expense Unallocated Corporate Other [Member] Business Segments [Axis] Business Segments [Axis] Segment [Domain] Segment [Domain] Software and Devices [Member] Service [Member] Revenue From External Customers Revenue from External Customers Schedule Of Nonvested Share Activity [Table Text Block] Schedule of Nonvested Share Activity [Table Text Block] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net [Abstract] Transfers (to) from the non-controlling interest: Share Based Compensation Arrangement By Share Based Payment Award Options Nonvested Outstanding Number Nonvested options at January 1, 2012 Nonvested options at January 1, 2012 Nonvested options at March 31, 2012 As of the balance sheet date, the number of shares into which expected to vest stock options outstanding can be converted under the option plan. Share Based Compensation Arrangement By Share Based Payment Award Options Nonvested Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value Weighted Average Grant Date Fair Value Nonvested options at January 1, 2012 Weighted Average Grant Date Fair Value Nonvested options at March 31, 2012 As of the balance sheet date, the number of shares into which expected to vest stock options weighted average grant date fair value under the option plan. Payments For Recoverable Local Taxes Payments For Recoverable Local Taxes Amount of payments for recoverable local taxes during the period. Legal Fees Legal Fees Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Stock Issued During Period, Value, New Issues Stock Issued During Period, Value, New Issues Operating Leases Refundable Rental Deposit Operating Leases Refundable Rental Deposit Amount of operating leases refundable rental deposit. Labor and Related Expense Labor and Related Expense Payments For Financial Advisory and Consulting Agreement Payments For Financial Advisory and Consulting Agreement Payments for financial advisory and consulting agreement. Plan Name [Domain] Stock Option Plan J [Member] Award Type [Domain] Statement Of Stockholders Equity Parenthetical [Abstract] Statement Of Stockholders Equity Parenthetical [Abstract] Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Additional Patent Transfer Description It represents the additional patent transfer description. Operating Leases Rental Payments The amount represents the operating leases rental payments. Warrant Issued In Connection With Issuance Of Convertible Notes Warrant issued in connection with issuance of convertible note in noncash investing and financing activities. Warrants issued in connection with issuance of convertible note