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Income Taxes - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2004 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |  |
Amount Equity would be increased |  | $ 18,300,000 mnkd_DeferredTaxAssetIncreaseDecreaseInEquity |  |
Change in the valuation allowance |  | 65,500,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 66,800,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 60,700,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Federal operating loss carryforwards |  | 1,800,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |  |
State operating loss carryforwards |  | 1,400,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal |  |
Net operating loss carryforwards | 216,000,000 mnkd_OperatingLossCarryforwardsSubjectToLimitation |  |  |
Net operating loss and credit carryforwards, annual use limitation | 13,000,000 mnkd_NetOperatingLossCarryforwardAnnualLimitation |  |  |
Federal |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carry-forwards, expiration year |  | 2018 |  |
Research and development credits subject to expiration |  | 48,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |
Federal research and development credits begin to expire |  | 2024 |  |
State |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carry-forwards, expiration year |  | 2015 |  |
Research and development credits not subject to expiration |  | $ 39,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |

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