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Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Sep. 23, 2014	Jul. 01, 2013
Fair Value of Financial Instruments [Line Items]
Cash and cash equivalents	$ 120,844,000us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 35,759,000us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 120,841,000us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 70,790,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash equivalents, money market funds	120,500,000us-gaap_MoneyMarketFundsAtCarryingValue		118,500,000us-gaap_MoneyMarketFundsAtCarryingValue
Transfers of assets between fair value measurement	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
Transfers of liabilities between fair value measurement	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet
License and Collaboration Agreement with Sanofi
Fair Value of Financial Instruments [Line Items]
Maximum secured loan facility					175,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_TypeOfArrangementAxis = mnkd_CollaborationAndLicenseAgreementMember
License and Collaboration Agreement with Sanofi | Sanofi-Aventis Deutschland GmbH
Fair Value of Financial Instruments [Line Items]
Maximum secured loan facility	175,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_RelatedPartyTransactionAxis = mnkd_SanofiAventisMember / us-gaap_TypeOfArrangementAxis = mnkd_CollaborationAndLicenseAgreementMember
Secured loan facility, amount borrowed	3,000,000us-gaap_ProceedsFromRelatedPartyDebt / us-gaap_RelatedPartyTransactionAxis = mnkd_SanofiAventisMember / us-gaap_TypeOfArrangementAxis = mnkd_CollaborationAndLicenseAgreementMember
Milestone Rights Liability | Deerfield | Maximum
Fair Value of Financial Instruments [Line Items]
Contingent liability for milestone payments						90,000,000mnkd_ContingentLiability / us-gaap_CreditFacilityAxis = mnkd_MilestoneRightsLiabilityMember / dei_LegalEntityAxis = mnkd_DeerfieldManagementCompanyLpMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Fair Value, Inputs, Level 3 | Milestone Rights Liability
Fair Value of Financial Instruments [Line Items]
Fair value of Milestone Rights	$ 47,600,000us-gaap_LiabilitiesFairValueDisclosure / us-gaap_CreditFacilityAxis = mnkd_MilestoneRightsLiabilityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 | Income Approach Valuation Technique | Milestone Rights Liability
Fair Value of Financial Instruments [Line Items]
Market discount rate	15.00%us-gaap_FairValueInputsDiscountRate / us-gaap_CreditFacilityAxis = mnkd_MilestoneRightsLiabilityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember
Fair Value, Inputs, Level 3 | Senior convertible notes due December 31, 2019 | Income Approach Valuation Technique
Fair Value of Financial Instruments [Line Items]
Market discount rate	12.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember
Fair Value, Inputs, Level 3 | Senior convertible notes due December 31, 2019 | Income Approach Valuation Technique | Less portion of commitment asset
Fair Value of Financial Instruments [Line Items]
Market discount rate	11.00%us-gaap_FairValueInputsDiscountRate / us-gaap_CreditFacilityAxis = mnkd_TrancheBMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

+ References

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Fair value of financial and nonfinancial obligations.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates.

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