Subsequent Events	9 Months Ended
Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	15. Subsequent Events Registered direct offering On October 10, 2017, the Company entered into securities purchase agreements (the “Purchase Agreements”) with certain institutional investors and a charitable foundation (collectively, the “Purchasers”). Pursuant to the terms of the Purchase Agreements, the Company sold to the Purchasers in a registered offering an aggregate of 10,166,600 shares of the Company’s common stock at a purchase price of $6.00 per share. Included in this offering was 166,600 shares issued to a charitable foundation associated with a Director of the Company. The net proceeds to the Company from the offering were approximately $57.7 million, after deducting placement agent fees equal to 5.0% of the aggregate gross proceeds from the offering (except for the proceeds received from the sale of 166,600 shares issued to the charitable foundation) and offering expenses payable by the Company. The offering closed on October 13, 2017. Issuance of 2021 notes and common stock in exchange for 2018 senior convertible notes On October 23, 2017, the Company entered into a privately negotiated exchange agreement with the holders of its 2018 notes, pursuant to which the Company agreed to exchange all of the outstanding 2018 notes in the aggregate principal amount of $27,690,000 for (i) $23,690,000 aggregate principal amount of 2021 notes and (ii) an aggregate of 973,236 shares of its common stock. The Company has classified the 2018 notes as long-term in its September 30, 2017 condensed consolidated balance sheet. The 2021 notes are the Company’s general, unsecured, senior obligations, except that the 2021 notes are subordinated in right of payment to the 2019 notes and the Tranche B notes. The 2021 notes rank equally in right of payment with the Company’s other unsecured senior debt. The 2021 notes bear interest at the rate of 5.75% per year on the principal amount, payable semiannually in arrears in cash or, at the option of the Company if certain conditions are met, in shares of the Company’s common stock (the “Interest Shares”), on February 15 and August 15 of each year, beginning February 15, 2018, with interest accruing from August 15, 2017. The aggregate number of Interest Shares that the Company may issue may not exceed 13,648,300, unless the Company receives stockholder approval to issue Interest Shares in excess of such number in accordance with the listing standards of The NASDAQ Global Market. The 2021 notes will mature on October 23, 2021. The 2021 notes are convertible, at the option of the holder, at any time on or prior to the close of business on the business day immediately preceding the stated maturity date, into shares of the Company’s common stock at a conversion rate of 194.1748 shares per $1,000 principal amount of 2021 notes, which is equal to a conversion price of approximately $5.15 per share. The conversion rate is subject to adjustment under certain circumstances described in an indenture governing the 2021 notes. If the Company undergoes certain fundamental changes, except in certain circumstances, each holder of 2021 notes will have the option to require the Company to repurchase all or any portion of that holder’s 2021 notes. The fundamental change repurchase price will be 100% of the principal amount of the 2021 notes to be repurchased plus accrued and unpaid interest, if any. The Company may elect at its option to cause all or any portion of the 2021 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. Fourth Amendment to Facility Agreement On October 23, 2017, the Company and MannKind LLC entered into a Fourth Amendment to the Facility Agreement, pursuant to which the parties (i) deferred the payment of $10.0 million in principal amount (the “October Payment”) of the 2019 notes from October 31, 2017 to January 15, 2018, with the Company depositing an amount of cash equal to the October Payment into an escrow account until the October Payment has been satisfied in full (subject to early release to the extent that portions of the October Payment are satisfied through the exchange of principal for shares of the Company’s common stock), and (ii) amended and restated the 2019 notes and the Tranche B notes to provide that Deerfield may convert the principal amount under such notes from time to time into an aggregate of up to 4,000,000 shares of the Company’s common stock after the effective date of the Fourth Amendment. The conversion price will be the greater of (i) the average of the volume weighted average price per share of the Company’s common stock for the three trading day period immediately preceding the date of any election by Deerfield to convert principal amounts of such notes and (ii) $3.25 per share, subject to adjustment under certain circumstances. Any conversions of principal by Deerfield under such notes will be applied first to reduce the October Payment, and after the October Payment has been satisfied, to reduce other principal payments due under the 2019 notes or the Tranche B notes. Transition and Separation Agreement On October 24, 2017, the Company entered into a transition and separation agreement (the “Agreement”) with Matthew J. Pfeffer, the Company’s former Chief Executive Officer and Chief Financial Officer, regarding the terms of Mr. Pfeffer’s transition and separation from the Company. Contemporaneously with his execution of the Agreement, Mr. Pfeffer submitted his resignation as a director of the Company, effective immediately. Pursuant to the Agreement, which became irrevocable on November 1, 2017, Mr. Pfeffer provided the Company with a general release of claims and will remain employed with the Company to provide transition and other services through February 1, 2019, subject to his earlier resignation or termination by the Company. Mr. Pfeffer reports to the Company’s principal executive officer during the term of the Agreement, serving in a non-executive capacity. During the term of the Agreement, and in lieu of any severance benefits Mr. Pfeffer may have been entitled to receive pursuant to the terms of his Executive Severance Agreement or Change of Control Agreement with the Company, Mr. Pfeffer will be entitled to receive his current annual base salary of $490,350. Mr. Pfeffer will also be eligible to receive an annual bonus for 2017 pursuant to the standard bonus compensation structure applicable to the Company’s executive officers. In addition, if Mr. Pfeffer remains employed with the Company through February 1, 2019, remains in compliance with the Agreement and all Company policies, and provides the Company with an effective general release of claims within 21 days after that date, the Company will pay Mr. Pfeffer a severance payment in the amount of $345,000.

15. Subsequent Events

Registered direct offering

On October 10, 2017, the Company entered into securities purchase agreements (the “Purchase Agreements”) with certain institutional investors and a charitable foundation (collectively, the “Purchasers”). Pursuant to the terms of the Purchase Agreements, the Company sold to the Purchasers in a registered offering an aggregate of 10,166,600 shares of the Company’s common stock at a purchase price of $6.00 per share. Included in this offering was 166,600 shares issued to a charitable foundation associated with a Director of the Company. The net proceeds to the Company from the offering were approximately $57.7 million, after deducting placement agent fees equal to 5.0% of the aggregate gross proceeds from the offering (except for the proceeds received from the sale of 166,600 shares issued to the charitable foundation) and offering expenses payable by the Company. The offering closed on October 13, 2017.

Issuance of 2021 notes and common stock in exchange for 2018 senior convertible notes

On October 23, 2017, the Company entered into a privately negotiated exchange agreement with the holders of its 2018 notes, pursuant to which the Company agreed to exchange all of the outstanding 2018 notes in the aggregate principal amount of $27,690,000 for (i) $23,690,000 aggregate principal amount of 2021 notes and (ii) an aggregate of 973,236 shares of its common stock. The Company has classified the 2018 notes as long-term in its September 30, 2017 condensed consolidated balance sheet.

The 2021 notes are the Company’s general, unsecured, senior obligations, except that the 2021 notes are subordinated in right of payment to the 2019 notes and the Tranche B notes. The 2021 notes rank equally in right of payment with the Company’s other unsecured senior debt. The 2021 notes bear interest at the rate of 5.75% per year on the principal amount, payable semiannually in arrears in cash or, at the option of the Company if certain conditions are met, in shares of the Company’s common stock (the “Interest Shares”), on February 15 and August 15 of each year, beginning February 15, 2018, with interest accruing from August 15, 2017. The aggregate number of Interest Shares that the Company may issue may not exceed 13,648,300, unless the Company receives stockholder approval to issue Interest Shares in excess of such number in accordance with the listing standards of The NASDAQ Global Market. The 2021 notes will mature on October 23, 2021.

The 2021 notes are convertible, at the option of the holder, at any time on or prior to the close of business on the business day immediately preceding the stated maturity date, into shares of the Company’s common stock at a conversion rate of 194.1748 shares per $1,000 principal amount of 2021 notes, which is equal to a conversion price of approximately $5.15 per share. The conversion rate is subject to adjustment under certain circumstances described in an indenture governing the 2021 notes.

If the Company undergoes certain fundamental changes, except in certain circumstances, each holder of 2021 notes will have the option to require the Company to repurchase all or any portion of that holder’s 2021 notes. The fundamental change repurchase price will be 100% of the principal amount of the 2021 notes to be repurchased plus accrued and unpaid interest, if any.

The Company may elect at its option to cause all or any portion of the 2021 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.

Fourth Amendment to Facility Agreement

On October 23, 2017, the Company and MannKind LLC entered into a Fourth Amendment to the Facility Agreement, pursuant to which the parties (i) deferred the payment of $10.0 million in principal amount (the “October Payment”) of the 2019 notes from October 31, 2017 to January 15, 2018, with the Company depositing an amount of cash equal to the October Payment into an escrow account until the October Payment has been satisfied in full (subject to early release to the extent that portions of the October Payment are satisfied through the exchange of principal for shares of the Company’s common stock), and (ii) amended and restated the 2019 notes and the Tranche B notes to provide that Deerfield may convert the principal amount under such notes from time to time into an aggregate of up to 4,000,000 shares of the Company’s common stock after the effective date of the Fourth Amendment. The conversion price will be the greater of (i) the average of the volume weighted average price per share of the Company’s common stock for the three trading day period immediately preceding the date of any election by Deerfield to convert principal amounts of such notes and (ii) $3.25 per share, subject to adjustment under certain circumstances. Any conversions of principal by Deerfield under such notes will be applied first to reduce the October Payment, and after the October Payment has been satisfied, to reduce other principal payments due under the 2019 notes or the Tranche B notes.

Transition and Separation Agreement

On October 24, 2017, the Company entered into a transition and separation agreement (the “Agreement”) with Matthew J. Pfeffer, the Company’s former Chief Executive Officer and Chief Financial Officer, regarding the terms of Mr. Pfeffer’s transition and separation from the Company. Contemporaneously with his execution of the Agreement, Mr. Pfeffer submitted his resignation as a director of the Company, effective immediately.

Pursuant to the Agreement, which became irrevocable on November 1, 2017, Mr. Pfeffer provided the Company with a general release of claims and will remain employed with the Company to provide transition and other services through February 1, 2019, subject to his earlier resignation or termination by the Company. Mr. Pfeffer reports to the Company’s principal executive officer during the term of the Agreement, serving in a non-executive capacity.

During the term of the Agreement, and in lieu of any severance benefits Mr. Pfeffer may have been entitled to receive pursuant to the terms of his Executive Severance Agreement or Change of Control Agreement with the Company, Mr. Pfeffer will be entitled to receive his current annual base salary of $490,350. Mr. Pfeffer will also be eligible to receive an annual bonus for 2017 pursuant to the standard bonus compensation structure applicable to the Company’s executive officers. In addition, if Mr. Pfeffer remains employed with the Company through February 1, 2019, remains in compliance with the Agreement and all Company policies, and provides the Company with an effective general release of claims within 21 days after that date, the Company will pay Mr. Pfeffer a severance payment in the amount of $345,000.