2.4.0.8 Html 54 163 1 false 28 0 false 5 false false R1.htm 000 - Disclosure - Document And Entity Information Sheet http://mriinterventions.com/role/DocumentAndEntityInformation Document And Entity Information true false R2.htm 001 - Statement - Condensed Balance Sheets (Unaudited) Sheet http://mriinterventions.com/role/ConsolidatedBalanceSheet Condensed Balance Sheets (Unaudited) false false R3.htm 002 - Statement - Condensed Balance Sheets (Unaudited) (Parentheticals) Sheet http://mriinterventions.com/role/ConsolidatedBalanceSheet_Parentheticals Condensed Balance Sheets (Unaudited) (Parentheticals) false false R4.htm 003 - Statement - Condensed Statements of Operations (Unaudited) Sheet http://mriinterventions.com/role/ConsolidatedIncomeStatement Condensed Statements of Operations (Unaudited) false false R5.htm 004 - Statement - Condensed Statements of Cash Flows (Unaudited) Sheet http://mriinterventions.com/role/ConsolidatedCashFlow Condensed Statements of Cash Flows (Unaudited) false false R6.htm 005 - Disclosure - Non-Cash Investing and Financing Transactions Sheet http://mriinterventions.com/role/NonCashInvestingandFinancingTransactions Non-Cash Investing and Financing Transactions false false R7.htm 006 - Disclosure - Note 1 - Description of the Business and Liquidity Sheet http://mriinterventions.com/role/Note1DescriptionoftheBusinessandLiquidity Note 1 - Description of the Business and Liquidity false false R8.htm 007 - Disclosure - Note 2 - Basis of Presentation and Summary of Significant Accounting Policies Sheet http://mriinterventions.com/role/Note2BasisofPresentationandSummaryofSignificantAccountingPolicies Note 2 - Basis of Presentation and Summary of Significant Accounting Policies false false R9.htm 008 - Disclosure - Note 3 - Inventory Sheet http://mriinterventions.com/role/Note3Inventory Note 3 - Inventory false false R10.htm 009 - Disclosure - Note 4 - Sale of Intellectual Property in Exchange for Cancellation of the Boston Scientific Notes Notes http://mriinterventions.com/role/Note4SaleofIntellectualPropertyinExchangeforCancellationoftheBostonScientificNotes Note 4 - Sale of Intellectual Property in Exchange for Cancellation of the Boston Scientific Notes false false R11.htm 010 - Disclosure - Note 5 - 2014 Junior Secured Notes Offering Notes http://mriinterventions.com/role/Note52014JuniorSecuredNotesOffering Note 5 - 2014 Junior Secured Notes Offering false false R12.htm 011 - Disclosure - Note 6 - Stockholders' Equity Sheet http://mriinterventions.com/role/Note6StockholdersEquity Note 6 - Stockholders' Equity false false R13.htm 012 - Disclosure - Note 7 - Legal Proceeding Sheet http://mriinterventions.com/role/Note7LegalProceeding Note 7 - Legal Proceeding false false R14.htm 013 - Disclosure - Note 8 - Modification of Co-Development Agreement Sheet http://mriinterventions.com/role/Note8ModificationofCoDevelopmentAgreement Note 8 - Modification of Co-Development Agreement false false R15.htm 014 - Disclosure - Accounting Policies, by Policy (Policies) Sheet http://mriinterventions.com/role/AccountingPoliciesByPolicy Accounting Policies, by Policy (Policies) false false R16.htm 015 - Disclosure - Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Tables) Sheet http://mriinterventions.com/role/Note2BasisofPresentationandSummaryofSignificantAccountingPoliciesTables Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Tables) false false R17.htm 016 - Disclosure - Note 3 - Inventory (Tables) Sheet http://mriinterventions.com/role/Note3InventoryTables Note 3 - Inventory (Tables) false false R18.htm 017 - Disclosure - Note 5 - 2014 Junior Secured Notes Offering (Tables) Notes http://mriinterventions.com/role/Note52014JuniorSecuredNotesOfferingTables Note 5 - 2014 Junior Secured Notes Offering (Tables) false false R19.htm 018 - Disclosure - Note 6 - Stockholders' Equity (Tables) Sheet http://mriinterventions.com/role/Note6StockholdersEquityTables Note 6 - Stockholders' Equity (Tables) false false R20.htm 019 - Disclosure - Non-Cash Investing and Financing Transactions (Details) Sheet http://mriinterventions.com/role/NonCashInvestingandFinancingTransactionsDetails Non-Cash Investing and Financing Transactions (Details) false false R21.htm 020 - Disclosure - Note 1 - Description of the Business and Liquidity (Details) Sheet http://mriinterventions.com/role/Note1DescriptionoftheBusinessandLiquidityDetails Note 1 - Description of the Business and Liquidity (Details) false false R22.htm 021 - Disclosure - Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) Sheet http://mriinterventions.com/role/Note2BasisofPresentationandSummaryofSignificantAccountingPoliciesDetails Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) false false R23.htm 022 - Disclosure - Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) - Carrying Values and Estimated Fair Values of Outstanding Notes Notes http://mriinterventions.com/role/CarryingValuesandEstimatedFairValuesofOutstandingNotesTable Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) - Carrying Values and Estimated Fair Values of Outstanding Notes false false R24.htm 023 - Disclosure - Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) - Financial Assets and Liabilities at Fair Value on a Recurring Basis Sheet http://mriinterventions.com/role/FinancialAssetsandLiabilitiesatFairValueonaRecurringBasisTable Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) - Financial Assets and Liabilities at Fair Value on a Recurring Basis false false R25.htm 024 - Disclosure - Note 3 - Inventory (Details) - Inventory Sheet http://mriinterventions.com/role/InventoryTable Note 3 - Inventory (Details) - Inventory false false R26.htm 025 - Disclosure - Note 4 - Sale of Intellectual Property in Exchange for Cancellation of the Boston Scientific Notes (Details) Notes http://mriinterventions.com/role/Note4SaleofIntellectualPropertyinExchangeforCancellationoftheBostonScientificNotesDetails Note 4 - Sale of Intellectual Property in Exchange for Cancellation of the Boston Scientific Notes (Details) false false R27.htm 026 - Disclosure - Note 5 - 2014 Junior Secured Notes Offering (Details) Notes http://mriinterventions.com/role/Note52014JuniorSecuredNotesOfferingDetails Note 5 - 2014 Junior Secured Notes Offering (Details) false false R28.htm 027 - Disclosure - Note 5 - 2014 Junior Secured Notes Offering (Details) - Assumptions Used in Calculating Fair Value of Warrants Issued, Directors Notes http://mriinterventions.com/role/AssumptionsUsedinCalculatingFairValueofWarrantsIssuedDirectorsTable Note 5 - 2014 Junior Secured Notes Offering (Details) - Assumptions Used in Calculating Fair Value of Warrants Issued, Directors false false R29.htm 028 - Disclosure - Note 6 - Stockholders' Equity (Details) Sheet http://mriinterventions.com/role/Note6StockholdersEquityDetails Note 6 - Stockholders' Equity (Details) false false R30.htm 029 - Disclosure - Note 6 - Stockholders' Equity (Details) - Assumptions Used in Calculating Fair Value of Warrants Issued, Private Placement Sheet http://mriinterventions.com/role/AssumptionsUsedinCalculatingFairValueofWarrantsIssuedPrivatePlacementTable Note 6 - Stockholders' Equity (Details) - Assumptions Used in Calculating Fair Value of Warrants Issued, Private Placement false false R31.htm 030 - Disclosure - Note 6 - Stockholders' Equity (Details) - Changes in Fair Values of Warrants Issued Sheet http://mriinterventions.com/role/ChangesinFairValuesofWarrantsIssuedTable Note 6 - Stockholders' Equity (Details) - Changes in Fair Values of Warrants Issued false false R32.htm 031 - Disclosure - Note 6 - Stockholders' Equity (Details) - Stock Options Activity Sheet http://mriinterventions.com/role/StockOptionsActivityTable Note 6 - Stockholders' Equity (Details) - Stock Options Activity false false R33.htm 032 - Disclosure - Note 6 - Stockholders' Equity (Details) - Stock Options Valuation Assumptions Sheet http://mriinterventions.com/role/StockOptionsValuationAssumptionsTable Note 6 - Stockholders' Equity (Details) - Stock Options Valuation Assumptions false false R34.htm 033 - Disclosure - Note 6 - Stockholders' Equity (Details) - Employee Share-Based Compensation Expense Sheet http://mriinterventions.com/role/EmployeeShareBasedCompensationExpenseTable Note 6 - Stockholders' Equity (Details) - Employee Share-Based Compensation Expense false false R35.htm 034 - Disclosure - Note 6 - Stockholders' Equity (Details) - Common Stock Warrants Sheet http://mriinterventions.com/role/CommonStockWarrantsTable Note 6 - Stockholders' Equity (Details) - Common Stock Warrants false false R36.htm 035 - Disclosure - Note 7 - Legal Proceeding (Details) Sheet http://mriinterventions.com/role/Note7LegalProceedingDetails Note 7 - Legal Proceeding (Details) false false All Reports Book All Reports Process Flow-Through: 001 - Statement - Condensed Balance Sheets (Unaudited) Process Flow-Through: Removing column 'Mar. 31, 2013' Process Flow-Through: Removing column 'Dec. 31, 2012' Process Flow-Through: 002 - Statement - Condensed Balance Sheets (Unaudited) (Parentheticals) Process Flow-Through: 003 - Statement - Condensed Statements of Operations (Unaudited) Process Flow-Through: 004 - Statement - Condensed Statements of Cash Flows (Unaudited) Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2013' mric-20140331.xml mric-20140331.xsd mric-20140331_cal.xml mric-20140331_def.xml mric-20140331_lab.xml mric-20140331_pre.xml true true