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Fair Value of Financial Instruments - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended |  |
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Dec. 20, 2012 | Oct. 18, 2012 | Dec. 31, 2014 Derivative | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Jul. 01, 2013 | Dec. 31, 2013 | Dec. 31, 2011 | May 06, 2014
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | $ 120,841,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 70,790,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 61,840,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 120,841,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 70,790,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 2,681,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |
Cash equivalents, money market funds |  |  | 118,500,000 us-gaap_MoneyMarketFundsAtCarryingValue | 67,700,000 us-gaap_MoneyMarketFundsAtCarryingValue |  | 118,500,000 us-gaap_MoneyMarketFundsAtCarryingValue |  | 67,700,000 us-gaap_MoneyMarketFundsAtCarryingValue |  |
Company's longer-term historical volatility rate |  |  | 55.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate | 65.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate |  |  |  |  |  |
Market discount rate | 1.50%us-gaap_FairValueInputsDiscountRate | 2.30%us-gaap_FairValueInputsDiscountRate |  |  |  |  |  |  |  |
Carrying value of Milestone Rights |  |  | 468,209,000 us-gaap_Liabilities | 289,359,000 us-gaap_Liabilities |  | 468,209,000 us-gaap_Liabilities |  | 289,359,000 us-gaap_Liabilities |  |
Transfers of assets between fair value measurement |  |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet |  |  |  |  |
Transfers of liabilities between fair value measurement |  |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet |  |  |  |  |
Number of embedded derivatives contained in facility financing obligation |  |  | 4 us-gaap_DerivativeNumberOfInstrumentsHeld |  |  | 4 us-gaap_DerivativeNumberOfInstrumentsHeld |  |  |  |
Major Transaction Put Option |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated fair value of the embedded derivative , cumulative probability percentage |  |  | 0.80%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_DerivativeInstrumentRiskAxis = mnkd_MajorTransactionPutOptionMember |  |  |  |  |  |  |
Conversion option feature |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated fair value of the embedded derivative , cumulative probability percentage |  |  | 0.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_DerivativeInstrumentRiskAxis = mnkd_ConversionRightFeatureOfConvertibleNotesMember |  |  |  |  |  |  |
Acceleration upon a Legal Judgment Against the Company in Excess of $100,000 |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated fair value of the embedded derivative , cumulative probability percentage |  |  | 0.10%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_DerivativeInstrumentRiskAxis = mnkd_AccelerationUponLegalJudgmentInExcessOfOneHundredThousandDollarMember |  |  |  |  |  |  |
Deerfield |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Facility arrangement amount to be paid in excess of legal judgment |  |  | 100,000 mnkd_LegalSettlementsAndCommitments / dei_LegalEntityAxis = mnkd_DeerfieldManagementCompanyLpMember |  |  |  |  |  |  |
Fair Value, Inputs, Level 3 | Milestone Rights Liability |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of Milestone Rights |  |  | 27,900,000 us-gaap_LiabilitiesFairValueDisclosure / mnkd_CreditAgreementAxis = mnkd_MilestoneRightsLiabilityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |  | 27,900,000 us-gaap_LiabilitiesFairValueDisclosure / mnkd_CreditAgreementAxis = mnkd_MilestoneRightsLiabilityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |  |  |
Carrying value of Milestone Rights |  |  | 13,100,000 us-gaap_Liabilities / mnkd_CreditAgreementAxis = mnkd_MilestoneRightsLiabilityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |  | 13,100,000 us-gaap_Liabilities / mnkd_CreditAgreementAxis = 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 / mnkd_CreditAgreementAxis = mnkd_MilestoneRightsLiabilityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |  |  |  |  |  |  |
Fair Value, Inputs, Level 3 | Commitment Asset | Income Approach Valuation Technique |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Market discount rate |  |  | 12.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = mnkd_CommitmentAssetMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |  |  |  |  |  |  |
Senior convertible notes due December 31, 2019 |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Additional commitment asset |  |  |  |  |  |  | 2,900,000 mnkd_LoanCommitmentAssetFairValue / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember |  |  |
Senior convertible notes due December 31, 2019 | Deerfield |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Additional commitment asset |  |  | 0 mnkd_LoanCommitmentAssetFairValue / dei_LegalEntityAxis = mnkd_DeerfieldManagementCompanyLpMember / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember |  |  | 0 mnkd_LoanCommitmentAssetFairValue / dei_LegalEntityAxis = mnkd_DeerfieldManagementCompanyLpMember / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember |  |  |  |
Senior convertible notes due December 31, 2019 | Deerfield | Less portion of commitment asset |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Additional commitment asset |  |  |  |  |  |  |  |  |  | 1,200,000 mnkd_LoanCommitmentAssetFairValue / us-gaap_CreditFacilityAxis = mnkd_TrancheBMember / dei_LegalEntityAxis = mnkd_DeerfieldManagementCompanyLpMember / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember
Principal amount of notes purchased |  |  | 20,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_CreditFacilityAxis = mnkd_TrancheBMember / dei_LegalEntityAxis = mnkd_DeerfieldManagementCompanyLpMember / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember |  |  | 20,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_CreditFacilityAxis = mnkd_TrancheBMember / dei_LegalEntityAxis = mnkd_DeerfieldManagementCompanyLpMember / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember |  |  |  | 20,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_CreditFacilityAxis = mnkd_TrancheBMember / dei_LegalEntityAxis = mnkd_DeerfieldManagementCompanyLpMember / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember
Senior convertible notes due December 31, 2019 | Deerfield | Notes Issued in Four Equal Tranches |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount of notes purchased |  |  | 160,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_CreditFacilityAxis = mnkd_NotesIssuedInFourEqualTranchesMember / dei_LegalEntityAxis = mnkd_DeerfieldManagementCompanyLpMember / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember |  |  | 160,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_CreditFacilityAxis = mnkd_NotesIssuedInFourEqualTranchesMember / dei_LegalEntityAxis = mnkd_DeerfieldManagementCompanyLpMember / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember |  |  |  |
Senior convertible notes due December 31, 2019 | Fair Value, Inputs, Level 3 | Less portion of commitment asset |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Additional commitment asset |  |  | $ 2,900,000 mnkd_LoanCommitmentAssetFairValue / us-gaap_CreditFacilityAxis = mnkd_TrancheBMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember |  |  | 2,900,000 mnkd_LoanCommitmentAssetFairValue / us-gaap_CreditFacilityAxis = mnkd_TrancheBMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember |  |  |  |
Percentage of market yield |  |  | 11.80%mnkd_CommitmentAssetsMarketYields / us-gaap_CreditFacilityAxis = mnkd_TrancheBMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember |  |  | 11.80%mnkd_CommitmentAssetsMarketYields / us-gaap_CreditFacilityAxis = mnkd_TrancheBMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember |  |  |  |
Senior convertible notes due December 31, 2019 | Fair Value, Inputs, Level 3 | Income Approach Valuation Technique |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Market discount rate |  |  | 12.40%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |  |  |  |  |  |  |
Senior convertible notes due December 31, 2019 | Fair Value, Inputs, Level 3 | Income Approach Valuation Technique | Less portion of commitment asset |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Market discount rate |  |  |  |  |  | 11.80%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 | 11.90%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 |  |  |
Senior convertible notes due December 31, 2019 | Fair Value, Inputs, Level 3 | Income Approach Valuation Technique | Tranche One |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Market discount rate |  |  |  |  |  | 12.30%us-gaap_FairValueInputsDiscountRate / us-gaap_CreditFacilityAxis = mnkd_TrancheOneMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |  | 12.70%us-gaap_FairValueInputsDiscountRate / us-gaap_CreditFacilityAxis = mnkd_TrancheOneMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |  |
Senior convertible notes due December 31, 2019 | Fair Value, Inputs, Level 3 | Income Approach Valuation Technique | Fourth tranche |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Market discount rate |  |  |  |  |  | 12.20%us-gaap_FairValueInputsDiscountRate / us-gaap_CreditFacilityAxis = mnkd_TrancheFourMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LongtermDebtTypeAxis = mnkd_TwoThousandNineteenNotesMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |  |  |  |

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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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