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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 12, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Trading Symbol MNKD    
Entity Registrant Name MannKind Corporation    
Entity Central Index Key 0000899460    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity File Number 000-50865    
Entity Tax Identification Number 13-3607736    
Entity Address, Address Line One 30930 Russell Ranch Road    
Entity Address, Address Line Two Suite 300    
Entity Address, City or Town Westlake Village    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 91362    
City Area Code (818)    
Local Phone Number 661-5000    
Entity Common Stock, Shares Outstanding   247,158,297  
Entity Public Float     $ 358,189,732
Document Annual Report true    
Document Transition Report false    
Entity Incorporation, State or Country Code DE    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Security Exchange Name NASDAQ    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag false    
Documents Incorporated by Reference

Portions of the registrant’s definitive Proxy Statement (the “Proxy Statement”) for the 2021 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission pursuant to Regulation 14A not later than April 30, 2021 are incorporated by reference in Part III of this Annual Report on Form 10-K.