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Borrowings - Senior Convertible Note - Additional Information (Detail)
3 Months Ended 6 Months Ended 9 Months Ended
Aug. 06, 2019
USD ($)
PromissoryNote
d
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
Jun. 30, 2019
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]              
Senior convertible notes outstanding   $ 9,957,000     $ 9,957,000   $ 19,099,000
Principal amount   $ 120,100,000     $ 120,100,000    
Conversion price of shares | $ / shares   $ 3.00     $ 3.00    
Gain (loss) on extinguishment of debt $ 3,100,000 $ 3,529,000 $ (712,000)   $ 3,529,000 $ (765,000)  
Unamortized premium   0     0   400,000
Bruce & Co.,Inc.              
Debt Instrument [Line Items]              
Principal amount   18,700     18,700    
Number of non interest bearing promissory notes | PromissoryNote 2            
2021 Notes              
Debt Instrument [Line Items]              
Senior convertible notes outstanding   10,000,000     10,000,000   $ 18,700,000
Repayments of aggregate principal amount         8,500,000    
Principal amount   10,200,000     10,200,000    
2021 Notes | Bruce & Co.,Inc.              
Debt Instrument [Line Items]              
Senior notes, effective interest rate 5.75%            
2021 Notes | Privately Negotiated Exchange Agreement | Bruce & Co.,Inc.              
Debt Instrument [Line Items]              
Repayments of aggregate principal amount $ 1,500,000            
Issuance of common stock to note holders | shares 4,017,857            
Exchange price per share | $ / shares $ 1.12            
2024 Convertible Notes              
Debt Instrument [Line Items]              
Principal amount   5,000,000     5,000,000    
No of convertible shares 333.3333            
Principal amount per share | $ / shares $ 1,000            
Conversion price of shares | $ / shares $ 3.00            
Debt default, description If certain bankruptcy and insolvency-related events of default occur, the principal of, and accrued and unpaid interest on, all of the then outstanding 2024 convertible notes shall automatically become due and payable. If an event of default other than certain bankruptcy and insolvency-related events of defaults occurs and is continuing, the Trustee or the holders of at least 25% in aggregate principal amount of the then-outstanding 2024 convertible notes, by written notice to the Trustee, may declare the 2024 convertible notes due and payable at their principal amount plus any accrued and unpaid interest, and thereupon the Trustee may, at its discretion, proceed to protect and enforce the rights of the holders by the appropriate judicial proceedings. Notwithstanding the foregoing, the Indenture provides that, to the extent the Company elects, the sole remedy for an event of default relating to certain failures by the Company to comply with certain reporting covenants in the Indenture will, for the first 180 days after such event of default, consist exclusively of the right to receive additional interest on the 2024 convertible notes.            
Percentage of repurchase price 100.00%            
Debt Instrument, redemption description       MannKind may elect at its option to cause all or any portion of the 2024 convertible notes to be mandatorily converted in whole or in part at any time prior to the close of business on the business day immediately preceding the maturity date, if the last reported sale price of its common stock equals or exceeds 120% of the conversion price then in effect for at least 10 trading days in any 20 trading day period, ending within five business days prior to the date of the mandatory conversion notice.      
Percentage of conversion price equaling stock price 120.00%            
Number of trading days | d 10            
Consecutive trading days 20 days            
2024 Convertible Notes | Bruce & Co.,Inc.              
Debt Instrument [Line Items]              
Senior notes, effective interest rate 5.75%            
Principal amount $ 5,000,000            
Debt instrument, maturity date, description The 2024 convertible notes will mature on the earlier of (i) November 4, 2024 or (ii) the 91st day after the payment in full of, and termination and discharge of all obligations (other than contingent indemnity obligations) under the MidCap Credit Facility.            
2024 Convertible Notes | Privately Negotiated Exchange Agreement | Bruce & Co.,Inc.              
Debt Instrument [Line Items]              
Senior notes, effective interest rate 5.75%            
June 2020 Note              
Debt Instrument [Line Items]              
Principal amount   2,600,000     $ 2,600,000    
Maturity date         Jun. 30, 2020    
June 2020 Note | Bruce & Co.,Inc.              
Debt Instrument [Line Items]              
Principal amount $ 2,600,000            
Maturity date Jun. 30, 2020            
December 2020 Note              
Debt Instrument [Line Items]              
Principal amount   $ 2,600,000     $ 2,600,000    
Maturity date         Dec. 31, 2020    
December 2020 Note | Bruce & Co.,Inc.              
Debt Instrument [Line Items]              
Principal amount $ 2,600,000            
Maturity date Dec. 31, 2020