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Accounting for Stock- Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 2,000,000us-gaap_AllocatedShareBasedCompensationExpense	$ 5,200,000us-gaap_AllocatedShareBasedCompensationExpense
Number of restricted stock units issued	36,300us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
Number of stock options issued	73,600us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Weighted average vesting period for unrecognized compensation cost	2 years 7 months 6 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award , vesting period	4 years
Fair value of the stock options granted , value	382,720us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Weighted average grant date fair value of the stock options granted	$ 5.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Unrecognized compensation cost related to non vested stock options	9,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of Restricted stock options granted , value	262,086us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Weighted average grant date fair value of the stock options granted	$ 7.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Unrecognized compensation cost related to non vested stock options	10,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Performance Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to non vested stock options	0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = mnkd_PerformanceBasedStockOptionsMember
Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to non vested stock options	$ 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = mnkd_PerformanceBasedRestrictedStockUnitsMember

X

- Definition

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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X

- Definition

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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X

- 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.

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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.

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- Definition

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.

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Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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