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Description of Business and Basis of Presentation - Additional Information (Detail) (USD $)	3 Months Ended	0 Months Ended	3 Months Ended
	Mar. 31, 2015	Aug. 11, 2014	Sep. 30, 2014	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 23, 2014
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Accumulated deficit	$ (2,525,447,000)us-gaap_RetainedEarningsAccumulatedDeficit			$ (2,494,784,000)us-gaap_RetainedEarningsAccumulatedDeficit
Stockholders' deficit	(97,031,000)us-gaap_StockholdersEquity			(73,770,000)us-gaap_StockholdersEquity
Cash and cash equivalents	120,844,000us-gaap_CashAndCashEquivalentsAtCarryingValue			120,841,000us-gaap_CashAndCashEquivalentsAtCarryingValue	35,759,000us-gaap_CashAndCashEquivalentsAtCarryingValue	70,790,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Principal amount of outstanding debt	232,500,000us-gaap_LongTermDebt
Amount available for future borrowings	30,100,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Potential proceeds from the exercise of warrants from February 2012 public offering	14,900,000mnkd_PotentialProceedsFromWarrantExercises
Maximum | ATM Agreements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Offering price of common stock under agreement	50,000,000mnkd_AggregateOfferingPriceUnderEachAgreement / mnkd_AgreementTypeAxis = mnkd_AtMarketSalesAgreementMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Senior convertible notes due August 15, 2015
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Principal amount of outstanding debt	100,000,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mnkd_SeniorConvertibleNotesDueTwoThousandFifteenMember
Senior notes, effective interest rate	5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mnkd_SeniorConvertibleNotesDueTwoThousandFifteenMember
Maturity date	Aug. 15, 2015
Deerfield | Senior convertible notes due December 31, 2019
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Senior notes, effective interest rate	9.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = mnkd_DeerfieldManagementCompanyLpMember / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember
Deerfield | Senior convertible notes due December 31, 2019 | Less portion of commitment asset
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Senior notes, effective interest rate	8.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = mnkd_TrancheBMember / dei_LegalEntityAxis = mnkd_DeerfieldManagementCompanyLpMember / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember
Deerfield | Senior convertible notes due December 31, 2019 | Minimum | Facility Agreement | Less portion of commitment asset
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Available amount of credit facility under covenant restrictions	25,000,000mnkd_LineOfCreditFacilityRestrictedBorrowingCapacity / mnkd_AgreementsAxis = mnkd_FacilityAgreementMember / us-gaap_CreditFacilityAxis = mnkd_TrancheBMember / dei_LegalEntityAxis = mnkd_DeerfieldManagementCompanyLpMember / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
License and Collaboration Agreement with Sanofi
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Senior notes, effective interest rate							8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_TypeOfArrangementAxis = mnkd_CollaborationAndLicenseAgreementMember
Up-front fee			150,000,000mnkd_UpfrontFee / us-gaap_TypeOfArrangementAxis = mnkd_CollaborationAndLicenseAgreementMember
Potential milestone payment	725,000,000mnkd_PotentialMilestonePayments / us-gaap_TypeOfArrangementAxis = mnkd_CollaborationAndLicenseAgreementMember	725,000,000mnkd_PotentialMilestonePayments / us-gaap_TypeOfArrangementAxis = mnkd_CollaborationAndLicenseAgreementMember
Profits and losses sharing percentage	35.00%mnkd_ProfitLossSharingAgreementAllocationPercentage / us-gaap_TypeOfArrangementAxis = mnkd_CollaborationAndLicenseAgreementMember	35.00%mnkd_ProfitLossSharingAgreementAllocationPercentage / us-gaap_TypeOfArrangementAxis = mnkd_CollaborationAndLicenseAgreementMember
Maximum secured loan facility							175,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_TypeOfArrangementAxis = mnkd_CollaborationAndLicenseAgreementMember
License and Collaboration Agreement with Sanofi | Sanofi-Aventis Deutschland GmbH
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Profits and losses sharing percentage	65.00%mnkd_ProfitLossSharingAgreementAllocationPercentage / us-gaap_RelatedPartyTransactionAxis = mnkd_SanofiAventisMember / us-gaap_TypeOfArrangementAxis = mnkd_CollaborationAndLicenseAgreementMember	65.00%mnkd_ProfitLossSharingAgreementAllocationPercentage / us-gaap_RelatedPartyTransactionAxis = mnkd_SanofiAventisMember / us-gaap_TypeOfArrangementAxis = mnkd_CollaborationAndLicenseAgreementMember
Maximum secured loan facility	175,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_RelatedPartyTransactionAxis = mnkd_SanofiAventisMember / us-gaap_TypeOfArrangementAxis = mnkd_CollaborationAndLicenseAgreementMember
License and Collaboration Agreement with Sanofi | Manufacturing Milestone Events
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Milestone payments earned	$ 50,000,000us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / mnkd_MilestoneEventsAxis = mnkd_ManufacturingMilestoneEventsMember / us-gaap_TypeOfArrangementAxis = mnkd_CollaborationAndLicenseAgreementMember

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