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Borrowings - Mann Group Promissory Notes - Additional Information (Detail) $ / shares in Units, $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Aug. 31, 2019 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) shares
Debt Instrument [Line Items] |  |  |
Common stock, shares issued | shares |  | 230,922,513 | 211,787,573
Principal amount |  | $ 122.6 |
The Mann Group L L C | Convertible Promissory Note |  |  |
Debt Instrument [Line Items] |  |  |
Conversion price of shares | $ / shares |  | $ 2.50 |
Principal amount |  | $ 35.0 | $ 35.0
Accrued Paid-in-Kind Interest |  | $ 2.9 | 1.0
Senior notes, effective interest rate |  | 7.00% |
The Mann Group L L C | Non Convertible Promissory Note |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount |  | $ 35.1 | 35.1
Accrued Paid-in-Kind Interest |  | $ 2.9 | $ 1.0
Senior notes, effective interest rate |  | 7.00% |
The Mann Group L L C | New Loan Arrangement | Convertible Promissory Note |  |  |
Debt Instrument [Line Items] |  |  |
Conversion price of shares | $ / shares | $ 2.50 |  |
Maturity date | Nov. 03, 2024 |  |
No of convertible shares | 400 |  |
Principal amount per share | $ / shares | $ 1,000 |  |
The Mann Group L L C | New Loan Arrangement | Promissory Notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes, effective interest rate | 7.00% |  |
Debt instrument payment term description | quarterly |  |
Debt instrument, date of first required interest payment | Oct. 01, 2019 |  |
The Mann Group L L C | New Loan Arrangement | Non Convertible Promissory Note |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, maturity date, description |  | The Mann Group non-convertible note will mature on the earlier of (i) November 3, 2024 or (ii) the 90th day after the repayment in full, and termination and discharge of all obligations (other than contingent indemnity obligations) under the MidCap Credit Facility. Interest on the Mann Group non-convertible note will be payable in kind by adding the amount thereof to the principal amount; provided that MannKind may, at its option, elect to pay any such interest on any interest payment date, if certain conditions are met, in shares of MannKind’s common stock at a price per shall equal to the last reported sale price on the trading day immediately prior to the interest payment date. |
The Mann Group L L C | Privately Negotiated Exchange Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of debt | $ 3.0 |  |
Common stock, shares issued | shares | 7,142,857 |  |
Conversion price of shares | $ / shares | $ 1.12 |  |
Conversion of notes to common shares, value | $ 71.5 |  |
Accrued Paid-in-Kind Interest | $ 9.5 |  |
The Mann Group L L C | Privately Negotiated Exchange Agreement | Loan Arrangement |  |  |
Debt Instrument [Line Items] |  |  |
Common stock price per share | $ / shares | $ 2.50 |  |
The Mann Group L L C | Privately Negotiated Exchange Agreement | Loan Arrangement | Convertible Promissory Note |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | $ 35.0 |  |
The Mann Group L L C | Privately Negotiated Exchange Agreement | Loan Arrangement | Non-Convertible Note |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | $ 35.1 |  |

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