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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		700,000mnkd_SharesReservedForEmployeeStockPurchasePlan	700,000mnkd_SharesReservedForEmployeeStockPurchasePlan	700,000mnkd_SharesReservedForEmployeeStockPurchasePlan
Share of common stock outstanding	1.00%mnkd_PercentageOfCommonStockSharesOutstanding
Shares sold to employees		305,076us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	463,290us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	422,260us-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		21,541,664us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	24,237,940us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Stock based compensation expense related to stock award plans and the ESPP		$ 48,622,000us-gaap_AllocatedShareBasedCompensationExpense	$ 45,186,000us-gaap_AllocatedShareBasedCompensationExpense	$ 13,292,000us-gaap_AllocatedShareBasedCompensationExpense
Number of employees allowed to withhold certain performance grants in excess of the minimum statutory requirements					124mnkd_NumberOfEmployees
Increase in stock-based compensation expense		23,000,000mnkd_IncreaseDecreaseInStockBasedCompensationExpense
Weighted average grant date fair value of the stock options granted		$ 4.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	$ 3.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	$ 0.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Total intrinsic value of options exercised		14,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	3,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Cash received from the exercise of options		11,000,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	2,300,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	9,200us-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		2,386,061mnkd_ShareBasedCompensationArrangementRestrictedStockUnitsNumberOfUnitsExpectedToVest
Weighted average grant date fair value		$ 5.23mnkd_WeightedAverageGrantDateFairValueOfRestrictedStockUnitsExpectedToVest
Total intrinsic value of restricted stock units expected to vest		12,500,000mnkd_ValueOfRestrictedStockUnitsVested
Total intrinsic value of restricted stock units vested		62,700,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested	13,900,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested	2,900,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
Fair value of restricted stock units vested		36,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	14,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	3,000,000us-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						21,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = mnkd_EquityIncentivePlanTwentyThirteenMember
Options to purchase common stock		7,380,839us-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	2,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = mnkd_EmployeeStockPurchasePlansMember	3,073,931us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = mnkd_EmployeeStockPurchasePlansMember
Share reserve automatic increase each year	700,000mnkd_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		9,000,000us-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		$ 10,600,000us-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		552,516us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / mnkd_StockAwardPlanTypeAxis = mnkd_ConsultantMember

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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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).

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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.

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