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Property and Equipment - Additional Information (Detail) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 USD ($)
Furniture, fixtures and office equipment |
Depreciation And Other Amortization Expenses [Line Items] |
Amount of divestiture of long-lived | $ 0.5

X
- Definition Depreciation and other amortization expenses. + References No definition available. + Details
Name: | mnkd_DepreciationAndOtherAmortizationExpensesLineItems
Namespace Prefix: | mnkd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentDisposals
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=mnkd_FurnitureFixturesAndOfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |