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Borrowings - Facility Financing Obligation - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Milestone rights liability | $ 7,263 | $ 7,263 | $ 7,201
Deerfield | Facility Financing Obligation |  |  |
Debt Instrument [Line Items] |  |  |
Remaining milestone rights liability | 7,300 | 7,300 | $ 8,900
Payment for milestone liability | 5,000 |  |
Milestone rights liability, current | 1,600 | 1,600 |
Milestone interest expense |  | 3,400 |
Milestone rights liability | $ 7,300 | $ 7,300 |

X
- Definition Milestone interest expense. + References No definition available. + Details
Name: | mnkd_MilestoneInterestExpense
Namespace Prefix: | mnkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Milestone rights liabilities current. + References No definition available. + Details
Name: | mnkd_MilestoneRightsLiabilitiesCurrent
Namespace Prefix: | mnkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Milestone rights liabilities current and noncurrent. + References No definition available. + Details
Name: | mnkd_MilestoneRightsLiabilitiesCurrentAndNoncurrent
Namespace Prefix: | mnkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Milestone rights liabilities noncurrent. + References No definition available. + Details
Name: | mnkd_MilestoneRightsLiabilitiesNoncurrent
Namespace Prefix: | mnkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Payment for milestone rights liabilities. + References No definition available. + Details
Name: | mnkd_PaymentForMilestoneRightsLiabilities
Namespace Prefix: | mnkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=mnkd_DeerfieldManagementCompanyLpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=mnkd_FacilityFinancingObligationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |