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Facility Agreement - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Jul. 01, 2013
Debt Instrument [Line Items]        
Short term liability $ 73,368,000us-gaap_OtherLongTermDebtCurrent   $ 72,995,000us-gaap_OtherLongTermDebtCurrent  
Interest expense on notes 9,622,000us-gaap_InterestExpenseDebt 4,042,000us-gaap_InterestExpenseDebt    
Deerfield        
Debt Instrument [Line Items]        
Principal repayment schedule, start date Jul. 01, 2016      
Principal repayment schedule, end date Dec. 09, 2019      
Deerfield | Milestone Rights Liability | Maximum        
Debt Instrument [Line Items]        
Contingent liability for milestone payments       90,000,000mnkd_ContingentLiability
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Deerfield | Senior convertible notes due December 31, 2019        
Debt Instrument [Line Items]        
Debt facility principal amount 60,000,000us-gaap_DebtInstrumentFaceAmount
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Senior notes, effective interest rate 9.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
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Deerfield | Senior convertible notes due December 31, 2019 | Milestone Rights Liability        
Debt Instrument [Line Items]        
Short term liability 1,600,000us-gaap_OtherLongTermDebtCurrent
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    3,200,000us-gaap_OtherLongTermDebtCurrent
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Long term liability 7,300,000us-gaap_OtherLongTermDebtNoncurrent
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    13,100,000us-gaap_OtherLongTermDebtNoncurrent
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Interest expense on notes 5,800,000us-gaap_InterestExpenseDebt
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Required payment pursuant to the terms of the Milestone Agreement 10,000,000mnkd_PaymentForContingentLiabilities
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Deerfield | Senior convertible notes due December 31, 2019 | Less portion of commitment asset        
Debt Instrument [Line Items]        
Debt facility principal amount 20,000,000us-gaap_DebtInstrumentFaceAmount
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Senior notes, effective interest rate 8.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
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Deerfield | Senior convertible notes due December 31, 2019 | Less portion of commitment asset | Minimum | Facility Agreement        
Debt Instrument [Line Items]        
Available amount of credit facility under covenant restrictions $ 25,000,000mnkd_LineOfCreditFacilityRestrictedBorrowingCapacity
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