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Stock Based Compensation Expense Recognized in Accompanying Statements of Operation (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation $ 48,622us-gaap_AllocatedShareBasedCompensationExpense $ 45,186us-gaap_AllocatedShareBasedCompensationExpense $ 13,292us-gaap_AllocatedShareBasedCompensationExpense
Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation 48,622us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= mnkd_EmployeeMember
45,181us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= mnkd_EmployeeMember
13,224us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= mnkd_EmployeeMember
Consultant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation   $ 5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= mnkd_ConsultantMember
$ 68us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= mnkd_ConsultantMember