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Stock Award Plans - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2004 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2014 Employee | May 23, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share reserve |  | 700,000 mnkd_SharesReservedForEmployeeStockPurchasePlan | 700,000 mnkd_SharesReservedForEmployeeStockPurchasePlan | 700,000 mnkd_SharesReservedForEmployeeStockPurchasePlan |  |
Share of common stock outstanding | 1.00%mnkd_PercentageOfCommonStockSharesOutstanding |  |  |  |  |
Shares sold to employees |  | 305,076 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 463,290 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 422,260 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans |  |
Stock option grants vest exercisable rate |  | 25.00%mnkd_StockOptionsGrantedVestingRate |  |  |  |
Restricted stock vesting rate |  | 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage |  |  |  |
Vesting period |  | 4 years |  |  |  |
Options to purchase common stock |  | 21,541,664 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 24,237,940 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |
Stock based compensation expense related to stock award plans and the ESPP |  | $ 48,622,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 45,186,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 13,292,000 us-gaap_AllocatedShareBasedCompensationExpense |  |
Number of employees allowed to withhold certain performance grants in excess of the minimum statutory requirements |  |  |  |  | 124 mnkd_NumberOfEmployees |
Increase in stock-based compensation expense |  | 23,000,000 mnkd_IncreaseDecreaseInStockBasedCompensationExpense |  |  |  |
Weighted average grant date fair value of the stock options granted |  | $ 4.76 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 3.26 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 0.99 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |  |
Total intrinsic value of options exercised |  | 14,900,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 3,100,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 1,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  |
Cash received from the exercise of options |  | 11,000,000 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | 2,300,000 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | 9,200 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions |  |
Weighted-average remaining contractual term |  | 6 years 9 months 29 days | 7 years 22 days | 7 years 26 days |  |
Restricted stock units expected to vest |  | 2,386,061 mnkd_ShareBasedCompensationArrangementRestrictedStockUnitsNumberOfUnitsExpectedToVest |  |  |  |
Weighted average grant date fair value |  | $ 5.23 mnkd_WeightedAverageGrantDateFairValueOfRestrictedStockUnitsExpectedToVest |  |  |  |
Total intrinsic value of restricted stock units expected to vest |  | 12,500,000 mnkd_ValueOfRestrictedStockUnitsVested |  |  |  |
Total intrinsic value of restricted stock units vested |  | 62,700,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested | 13,900,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested | 2,900,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested |  |
Fair value of restricted stock units vested |  | 36,400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue | 14,900,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue | 3,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue |  |
Weighted average vesting period for unrecognized compensation cost |  | 2 years 10 months 24 days |  |  |  |
Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares reserved under ESPP | 10.00%mnkd_PercentageOfShareReservedForShareBasedCompensation / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Performance mile stone period range |  | 96 months |  |  |  |
Options granted expiry term |  | 10 years |  |  |  |
Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance mile stone period range |  | 11 months |  |  |  |
2013 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Equity incentive plan, shares |  |  |  |  |  | 21,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = mnkd_EquityIncentivePlanTwentyThirteenMember
Options to purchase common stock |  | 7,380,839 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = mnkd_EquityIncentivePlanTwentyThirteenMember |  |  |  |
Employee Stock Purchase Plans |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares reserved for issuance | 2,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = mnkd_EmployeeStockPurchasePlansMember | 3,073,931 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = mnkd_EmployeeStockPurchasePlansMember |  |  |  |
Share reserve automatic increase each year | 700,000 mnkd_EmployeeStockPurchasePlanAnnualIncreaseInReservedShares / us-gaap_PlanNameAxis = mnkd_EmployeeStockPurchasePlansMember |  |  |  |  |
Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  | 36 months |  |  |  |
Unrecognized compensation cost related to non vested stock options |  | 9,000,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost related to non vested stock options |  | $ 10,600,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Consultant |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Options to purchase common stock |  | 552,516 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / mnkd_StockAwardPlanTypeAxis = mnkd_ConsultantMember |  |  |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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