2.4.0.6 Html 252 438 1 false 85 0 false 5 false false R1.htm 0000 - Document - Document and Entity Information Sheet http://www.merrimackpharma.com/role/DocumentAndEntityInformation Document and Entity Information true false R2.htm 0010 - Statement - Consolidated Balance Sheets Sheet http://www.merrimackpharma.com/role/BalanceSheet Consolidated Balance Sheets false false R3.htm 0015 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.merrimackpharma.com/role/BalanceSheetParenthetical Consolidated Balance Sheets (Parenthetical) false false R4.htm 0020 - Statement - Consolidated Statements of Comprehensive Loss Sheet http://www.merrimackpharma.com/role/StatementOfIncome Consolidated Statements of Comprehensive Loss false false R5.htm 0030 - Statement - Consolidated Statements of Convertible Preferred Stock, Non-controlling Interest and Stockholders' (Deficit) Equity Sheet http://www.merrimackpharma.com/role/StatementOfStockholdersEquity Consolidated Statements of Convertible Preferred Stock, Non-controlling Interest and Stockholders' (Deficit) Equity false false R6.htm 0035 - Statement - Consolidated Statements of Convertible Preferred Stock, Non-controlling Interest and Stockholders' (Deficit) Equity (Temporary) Sheet http://www.merrimackpharma.com/role/StatementOfStockholdersEquityTemporary Consolidated Statements of Convertible Preferred Stock, Non-controlling Interest and Stockholders' (Deficit) Equity (Temporary) false false R7.htm 0040 - Statement - Consolidated Statements of Cash Flows Sheet http://www.merrimackpharma.com/role/CashFlows Consolidated Statements of Cash Flows false false R8.htm 1010 - Disclosure - Nature of the Business Sheet http://www.merrimackpharma.com/role/DisclosureNatureOfTheBusiness Nature of the Business false false R9.htm 1020 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.merrimackpharma.com/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies false false R10.htm 1030 - Disclosure - Initial Public Offering Sheet http://www.merrimackpharma.com/role/DisclosureInitialPublicOffering Initial Public Offering false false R11.htm 1040 - Disclosure - Marketable Securities Sheet http://www.merrimackpharma.com/role/DisclosureMarketableSecurities Marketable Securities false false R12.htm 1050 - Disclosure - Net Loss Per Common Share Sheet http://www.merrimackpharma.com/role/DisclosureNetLossPerCommonShare Net Loss Per Common Share false false R13.htm 1060 - Disclosure - License and Collaboration Agreements Sheet http://www.merrimackpharma.com/role/DisclosureLicenseAndCollaborationAgreements License and Collaboration Agreements false false R14.htm 1070 - Disclosure - Fair Value of Financial Instruments Sheet http://www.merrimackpharma.com/role/DisclosureFairValueOfFinancialInstruments Fair Value of Financial Instruments false false R15.htm 1080 - Disclosure - Consolidated Subsidiaries Sheet http://www.merrimackpharma.com/role/DisclosureConsolidatedSubsidiaries Consolidated Subsidiaries false false R16.htm 1090 - Disclosure - Goodwill and Intangible Assets, Net Sheet http://www.merrimackpharma.com/role/DisclosureGoodwillAndIntangibleAssetsNet Goodwill and Intangible Assets, Net false false R17.htm 1100 - Disclosure - Property and Equipment, Net Sheet http://www.merrimackpharma.com/role/DisclosurePropertyAndEquipmentNet Property and Equipment, Net false false R18.htm 1110 - Disclosure - Accounts Payables, Accrued Expenses and Other Sheet http://www.merrimackpharma.com/role/DisclosureAccountsPayablesAccruedExpensesAndOther Accounts Payables, Accrued Expenses and Other false false R19.htm 1120 - Disclosure - Debt Sheet http://www.merrimackpharma.com/role/DisclosureDebt Debt false false R20.htm 1130 - Disclosure - Convertible Preferred Stock Sheet http://www.merrimackpharma.com/role/DisclosureConvertiblePreferredStock Convertible Preferred Stock false false R21.htm 1140 - Disclosure - Series F Amount Sheet http://www.merrimackpharma.com/role/DisclosureSeriesFAmount Series F Amount false false R22.htm 1150 - Disclosure - Stock Warrants Sheet http://www.merrimackpharma.com/role/DisclosureStockWarrants Stock Warrants false false R23.htm 1160 - Disclosure - Common Stock Sheet http://www.merrimackpharma.com/role/DisclosureCommonStock Common Stock false false R24.htm 1170 - Disclosure - Stock-Based Compensation Sheet http://www.merrimackpharma.com/role/DisclosureStockBasedCompensation Stock-Based Compensation false false R25.htm 1180 - Disclosure - Income Taxes Sheet http://www.merrimackpharma.com/role/DisclosureIncomeTaxes Income Taxes false false R26.htm 1190 - Disclosure - Commitments and Contingencies Sheet http://www.merrimackpharma.com/role/DisclosureCommitmentsAndContingencies Commitments and Contingencies false false R27.htm 1200 - Disclosure - Related Party Transactions Sheet http://www.merrimackpharma.com/role/DisclosureRelatedPartyTransactions Related Party Transactions false false R28.htm 1210 - Disclosure - Retirement Plan Sheet http://www.merrimackpharma.com/role/DisclosureRetirementPlan Retirement Plan false false R29.htm 1220 - Disclosure - Selected Quarterly Financial Data (Unaudited) Sheet http://www.merrimackpharma.com/role/DisclosureSelectedQuarterlyFinancialData Selected Quarterly Financial Data (Unaudited) false false R30.htm 1230 - Disclosure - Subsequent Events Sheet http://www.merrimackpharma.com/role/DisclosureSubsequentEvents Subsequent Events false false R31.htm 2020 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.merrimackpharma.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) false false R32.htm 3020 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) false false R33.htm 3040 - Disclosure - Marketable Securities (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureMarketableSecuritiesTables Marketable Securities (Tables) false false R34.htm 3050 - Disclosure - Net Loss Per Common Share (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureNetLossPerCommonShareTables Net Loss Per Common Share (Tables) false false R35.htm 3060 - Disclosure - License and Collaboration Agreements (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureLicenseAndCollaborationAgreementsTables License and Collaboration Agreements (Tables) false false R36.htm 3070 - Disclosure - Fair Value of Financial Instruments (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureFairValueOfFinancialInstrumentsTables Fair Value of Financial Instruments (Tables) false false R37.htm 3090 - Disclosure - Goodwill and Intangible Assets, Net (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureGoodwillAndIntangibleAssetsNetTables Goodwill and Intangible Assets, Net (Tables) false false R38.htm 3100 - Disclosure - Property and Equipment, Net (Tables) Sheet http://www.merrimackpharma.com/role/DisclosurePropertyAndEquipmentNetTables Property and Equipment, Net (Tables) false false R39.htm 3110 - Disclosure - Accounts Payables, Accrued Expenses and Other (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureAccountsPayablesAccruedExpensesAndOtherTables Accounts Payables, Accrued Expenses and Other (Tables) false false R40.htm 3120 - Disclosure - Debt (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureDebtTables Debt (Tables) false false R41.htm 3130 - Disclosure - Convertible preferred stock (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureConvertiblePreferredStockTables Convertible preferred stock (Tables) false false R42.htm 3150 - Disclosure - Stock Warrants (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureStockWarrantsTables Stock Warrants (Tables) false false R43.htm 3160 - Disclosure - Common Stock (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureCommonStockTables Common Stock (Tables) false false R44.htm 3170 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureStockBasedCompensationTables Stock-Based Compensation (Tables) false false R45.htm 3180 - Disclosure - Income Taxes (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureIncomeTaxesTables Income Taxes (Tables) false false R46.htm 3190 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureCommitmentsAndContingenciesTables Commitments and Contingencies (Tables) false false R47.htm 3220 - Disclosure - Selected Quarterly Financial Data (Unaudited) (Tables) Sheet http://www.merrimackpharma.com/role/DisclosureSelectedQuarterlyFinancialDataTables Selected Quarterly Financial Data (Unaudited) (Tables) false false R48.htm 4010 - Disclosure - Nature of the Business (Details) Sheet http://www.merrimackpharma.com/role/DisclosureNatureOfTheBusinessDetails Nature of the Business (Details) false false R49.htm 4011 - Disclosure - Nature of the Business (Details 2) Sheet http://www.merrimackpharma.com/role/DisclosureNatureOfTheBusinessDetails2 Nature of the Business (Details 2) false false R50.htm 4020 - Disclosure - Summary of Significant Accounting Policies (Details) Sheet http://www.merrimackpharma.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails Summary of Significant Accounting Policies (Details) false false R51.htm 4021 - Disclosure - Summary of Significant Accounting Policies (Details 2) Sheet http://www.merrimackpharma.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails2 Summary of Significant Accounting Policies (Details 2) false false R52.htm 4022 - Disclosure - Summary of Significant Accounting Policies (Details 3) Sheet http://www.merrimackpharma.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails3 Summary of Significant Accounting Policies (Details 3) false false R53.htm 4023 - Disclosure - Summary of Significant Accounting Policies (Details 4) Sheet http://www.merrimackpharma.com/role/DisclosureSummaryofSignificantAccountingPoliciesDetails4 Summary of Significant Accounting Policies (Details 4) false false R54.htm 4024 - Disclosure - Summary of Significant Accounting Policies (Details 5) Sheet http://www.merrimackpharma.com/role/DisclosureSummaryofSignificantAccountingPoliciesDetails5 Summary of Significant Accounting Policies (Details 5) false false R55.htm 4025 - Disclosure - Summary of Significant Accounting Policies (Details 6) Sheet http://www.merrimackpharma.com/role/DisclosureSummaryofSignificantAccountingPoliciesDetails6 Summary of Significant Accounting Policies (Details 6) false false R56.htm 4026 - Disclosure - Summary of Significant Accounting Policies (Details 7) Sheet http://www.merrimackpharma.com/role/DisclosureSummaryofSignificantAccountingPoliciesDetails7 Summary of Significant Accounting Policies (Details 7) false false R57.htm 4027 - Disclosure - Summary of Significant Accounting Policies (Details 8) Sheet http://www.merrimackpharma.com/role/DisclosureSummaryofSignificantAccountingPoliciesDetails8 Summary of Significant Accounting Policies (Details 8) false false R58.htm 4030 - Disclosure - Initial Public Offering (Details) Sheet http://www.merrimackpharma.com/role/DisclosureInitialPublicOfferingDetails Initial Public Offering (Details) false false R59.htm 4040 - Disclosure - Marketable Securities (Details) Sheet http://www.merrimackpharma.com/role/DisclosureMarketableSecuritiesDetails Marketable Securities (Details) false false R60.htm 4050 - Disclosure - Net Loss Per Common Share (Details) Sheet http://www.merrimackpharma.com/role/DisclosureNetLossPerCommonShareDetails Net Loss Per Common Share (Details) false false R61.htm 4060 - Disclosure - License and Collaboration Agreements (Details) Sheet http://www.merrimackpharma.com/role/DisclosureLicenseAndCollaborationAgreementsDetails License and Collaboration Agreements (Details) false false R62.htm 4070 - Disclosure - Fair Value of Financial Instruments (Details) Sheet http://www.merrimackpharma.com/role/DisclosureFairValueOfFinancialInstrumentsDetails Fair Value of Financial Instruments (Details) false false R63.htm 4071 - Disclosure - Fair Value of Financial Instruments (Details 2) Sheet http://www.merrimackpharma.com/role/DisclosureFairValueOfFinancialInstrumentsDetails2 Fair Value of Financial Instruments (Details 2) false false R64.htm 4080 - Disclosure - Consolidated Subsidiaries (Details) Sheet http://www.merrimackpharma.com/role/DisclosureConsolidatedSubsidiariesDetails Consolidated Subsidiaries (Details) false false R65.htm 4081 - Disclosure - Consolidated Subsidiaries (Details 2) Sheet http://www.merrimackpharma.com/role/DisclosureConsolidatedSubsidiariesDetails2 Consolidated Subsidiaries (Details 2) false false R66.htm 4090 - Disclosure - Goodwill and Intangible Assets, Net (Details) Sheet http://www.merrimackpharma.com/role/DisclosureGoodwillandIntangibleAssetsNetDetails Goodwill and Intangible Assets, Net (Details) false false R67.htm 4091 - Disclosure - Goodwill and Intangible Assets, Net (Details 2) Sheet http://www.merrimackpharma.com/role/DisclosureGoodwillAndIntangibleAssetsNetDetails2 Goodwill and Intangible Assets, Net (Details 2) false false R68.htm 4100 - Disclosure - Property and Equipment, Net (Details) Sheet http://www.merrimackpharma.com/role/DisclosurePropertyAndEquipmentNetDetails Property and Equipment, Net (Details) false false R69.htm 4110 - Disclosure - Accounts Payables, Accrued Expenses and Other (Details) Sheet http://www.merrimackpharma.com/role/DisclosureAccountsPayablesAccruedExpensesAndOtherDetails Accounts Payables, Accrued Expenses and Other (Details) false false R70.htm 4120 - Disclosure - Debt (Details) Sheet http://www.merrimackpharma.com/role/DisclosureDebtDetails Debt (Details) false false R71.htm 4130 - Disclosure - Convertible Preferred Stock (Details) Sheet http://www.merrimackpharma.com/role/DisclosureConvertiblePreferredStockDetails Convertible Preferred Stock (Details) false false R72.htm 4131 - Disclosure - Convertible Preferred Stock (Details 2) Sheet http://www.merrimackpharma.com/role/DisclosureConvertiblePreferredStockDetails2 Convertible Preferred Stock (Details 2) false false R73.htm 4132 - Disclosure - Convertible Preferred Stock (Details 3) Sheet http://www.merrimackpharma.com/role/DisclosureConvertiblePreferredStockDetails3 Convertible Preferred Stock (Details 3) false false R74.htm 4140 - Disclosure - Series F Amount (Details) Sheet http://www.merrimackpharma.com/role/DisclosureSeriesFAmountDetails Series F Amount (Details) false false R75.htm 4150 - Disclosure - Stock Warrants (Details) Sheet http://www.merrimackpharma.com/role/DisclosureStockWarrantsDetails Stock Warrants (Details) false false R76.htm 4160 - Disclosure - Common Stock (Details) Sheet http://www.merrimackpharma.com/role/DisclosureCommonStockDetails Common Stock (Details) false false R77.htm 4170 - Disclosure - Stock-Based Compensation (Details) Sheet http://www.merrimackpharma.com/role/DisclosureStockBasedCompensationDetails Stock-Based Compensation (Details) false false R78.htm 4171 - Disclosure - Stock-Based Compensation (Details 2) Sheet http://www.merrimackpharma.com/role/DisclosureStockBasedCompensationDetails2 Stock-Based Compensation (Details 2) false false R79.htm 4172 - Disclosure - Stock-Based Compensation (Details 3) Sheet http://www.merrimackpharma.com/role/DisclosureStockBasedCompensationDetails3 Stock-Based Compensation (Details 3) false false R80.htm 4173 - Disclosure - Stock-Based Compensation (Details 4) Sheet http://www.merrimackpharma.com/role/DisclosureStockBasedCompensationDetails4 Stock-Based Compensation (Details 4) false false R81.htm 4180 - Disclosure - Income Taxes (Details) Sheet http://www.merrimackpharma.com/role/DisclosureIncomeTaxesDetails Income Taxes (Details) false false R82.htm 4181 - Disclosure - Income Taxes (Details 2) Sheet http://www.merrimackpharma.com/role/DisclosureIncomeTaxesDetails2 Income Taxes (Details 2) false false R83.htm 4182 - Disclosure - Income Taxes (Details 3) Sheet http://www.merrimackpharma.com/role/DisclosureIncomeTaxesDetails3 Income Taxes (Details 3) false false R84.htm 4190 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.merrimackpharma.com/role/DisclosureCommitmentsAndContingenciesDetails Commitments and Contingencies (Details) false false R85.htm 4200 - Disclosure - Related Party Transactions (Details) Sheet http://www.merrimackpharma.com/role/DisclosureRelatedPartyTransactionsDetails Related Party Transactions (Details) false false R86.htm 4210 - Disclosure - Retirement Plan (Details) Sheet http://www.merrimackpharma.com/role/DisclosureRetirementPlanDetails Retirement Plan (Details) false false R87.htm 4220 - Disclosure - Selected Quarterly Financial Data (Unaudited) (Details) Sheet http://www.merrimackpharma.com/role/DisclosureSelectedQuarterlyFinancialDataDetails Selected Quarterly Financial Data (Unaudited) (Details) false false R88.htm 4230 - Disclosure - Subsequent Events (Details) Sheet http://www.merrimackpharma.com/role/Disclosure-SubsequentEventsDetails Subsequent Events (Details) false false All Reports Book All Reports Element mack_AcquiredInprocessResearchAndDevelopment had a mix of decimals attribute values: -3 0. Element mack_AdjustmentsToAdditionalPaidInCapitalAccruedNonCashInterestRelatedToSeriesF2010ExchangeAgreement had a mix of decimals attribute values: -3 0. Element mack_NoncontrollingInterestEquityPreferredFairValue had a mix of decimals attribute values: -3 0. Element us-gaap_Assets had a mix of decimals attribute values: -3 0. Element us-gaap_CommonStockSharesAuthorized had a mix of decimals attribute values: -5 -3. Element us-gaap_DebtInstrumentUnamortizedDiscount had a mix of decimals attribute values: -5 -3. Element us-gaap_DividendsPayableCurrentAndNoncurrent had a mix of decimals attribute values: -5 -3. Element us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability had a mix of decimals attribute values: -3 0. Element us-gaap_Liabilities had a mix of decimals attribute values: -3 0. Element us-gaap_PaymentsOfStockIssuanceCosts had a mix of decimals attribute values: -3 0. Element us-gaap_PropertyPlantAndEquipmentNet had a mix of decimals attribute values: -3 0. Element us-gaap_ResearchAndDevelopmentExpense had a mix of decimals attribute values: -5 -3. Element us-gaap_Revenues had a mix of decimals attribute values: -3 0. Element us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized had a mix of decimals attribute values: -5 0. Element us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross had a mix of decimals attribute values: -5 -3. Element us-gaap_StockIssuedDuringPeriodSharesNewIssues had a mix of decimals attribute values: -3 0. Element us-gaap_TemporaryEquitySharesIssued had a mix of decimals attribute values: -3 0. 'Shares' elements on report '0015 - Statement - Consolidated Balance Sheets (Parenthetical)' had a mix of different decimal attribute values. 'Shares' elements on report '0030 - Statement - Consolidated Statements of Convertible Preferred Stock, Non-controlling Interest and Stockholders' (Deficit) Equity' had a mix of different decimal attribute values. 'Monetary' elements on report '0030 - Statement - Consolidated Statements of Convertible Preferred Stock, Non-controlling Interest and Stockholders' (Deficit) Equity' had a mix of different decimal attribute values. 'Monetary' elements on report '4060 - Disclosure - License and Collaboration Agreements (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '4100 - Disclosure - Property and Equipment, Net (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '4120 - Disclosure - Debt (Details)' had a mix of different decimal attribute values. 'Shares' elements on report '4150 - Disclosure - Stock Warrants (Details)' had a mix of different decimal attribute values. 'Shares' elements on report '4160 - Disclosure - Common Stock (Details)' had a mix of different decimal attribute values. 'Shares' elements on report '4170 - Disclosure - Stock-Based Compensation (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '4173 - Disclosure - Stock-Based Compensation (Details 4)' had a mix of different decimal attribute values. 'Monetary' elements on report '4182 - Disclosure - Income Taxes (Details 3)' had a mix of different decimal attribute values. Process Flow-Through: 0010 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Sep. 30, 2011' Process Flow-Through: Removing column 'Dec. 31, 2010' Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: 0015 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: Removing column 'Apr. 30, 2012' Process Flow-Through: Removing column 'Mar. 31, 2012' Process Flow-Through: Removing column 'Dec. 31, 2010' Process Flow-Through: 0020 - Statement - Consolidated Statements of Comprehensive Loss Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2012' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2012' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2012' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2012' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2011' Process Flow-Through: 0040 - Statement - Consolidated Statements of Cash Flows mack-20121231.xml mack-20121231.xsd mack-20121231_cal.xml mack-20121231_def.xml mack-20121231_lab.xml mack-20121231_pre.xml true true