Description of Business	12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]
Description of Business	1. Description of Business Business — MannKind Corporation and its subsidiaries (the “Company”) is a biopharmaceutical company focused on the development and commercialization of inhaled therapeutic products for patients with endocrine and orphan lung diseases. The Company’s development team is capable of taking a compound from early formulation feasibility studies to a full commercial-scale manufacturing operation. The Company’s commercial team includes a specialty sales force that calls on endocrinologists and selected primary care physicians, as well as supporting functions that are directed to improving market access and delivering patient and physician support programs. Basis of Presentation — The accompanying consolidated financial statements have been prepared assuming that the Company will continue as a going concern which contemplates the realization of assets and satisfaction of liabilities in the normal course of business. The Company is not currently profitable and has rarely generated positive net cash flow from operations. In addition, the Company expects to continue to incur significant expenditures for the foreseeable future in support of its manufacturing operations, sales and marketing costs for Afrezza, and development costs for product candidates in the Company’s pipeline. As of December 31, 2020, the Company had an accumulated deficit of $3.0 billion and $122.9 million of total principal amount of outstanding borrowings, with limited capital resources of $67.0 million in cash and cash equivalents. Further, the ongoing COVID-19 pandemic has adversely impacted the Company’s Afrezza net sales and could impact the ability to access capital and comply with covenants under debt covenants. These financial conditions raise substantial doubt about the Company’s ability to continue as a going concern. In August 2019, the Company and its wholly owned subsidiaries, entered into a credit and security agreement with MidCap Financial Trust (as amended, the “MidCap Credit Facility”) to restructure its existing debts and to provide additional operating capital (the “recapitalization”) (Refer to Note 7 – Borrowings for further details). The MidCap Credit Facility provides a secured term loan facility with an aggregate principal amount of up to $75.0 million, of which $50.0 million was outstanding as of December 31, 2020. The remaining $25.0 million will be available to the Company between October 1, 2021 and March 31, 2022, subject to the satisfaction of certain milestone conditions associated with Tyvaso DPI through the Company’s collaboration with United Therapeutics (see Note 8 – Collaboration, Licensing and Other Arrangements for more information on the collaboration agreement with United Therapeutics). Principal payments on the MidCap Credit Facility will begin in September 2022. Under the MidCap Credit Facility, the Company must comply with certain covenants, which includes requirements to maintain a minimum of $30.0 million of unrestricted cash and cash equivalents as well as meet certain minimum Afrezza net revenue trailing twelve-month thresholds, tested on a monthly basis. The Company’s capital resources may not be sufficient to continue to meet its current and anticipated obligations, including the need to maintain compliance with its debt covenants, over the next twelve months if the Company cannot increase its operating cash inflows by growing its revenue or obtaining access to the remaining $25.0 million in borrowings that may become available under its MidCap Credit Facility. In the event these capital resources are not sufficient, the Company may need to raise additional capital by selling equity or debt securities, entering into strategic business collaboration agreements with other companies, seeking other funding facilities or licensing arrangements, selling assets or by other means. However, the Company cannot provide assurances that additional capital will be available on acceptable terms or at all. If the Company is unable to meet its current and anticipated obligations over the next twelve months through its existing capital resources, or obtain new sources of capital when needed, the Company may have to reduce the scope of its commercial operations, reduce or eliminate one or more of its development programs, and/or make significant changes to its operating plan. These factors raise substantial doubt about the Company’s ability to continue as a going concern. The accompanying financial statements do not include any adjustments that might result from the outcome of this uncertainty. Principles of Consolidation — The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. Intercompany balances and transactions have been eliminated. Certain prior year amounts have been reclassified for consistency with the current year presentation. Changes were made to Note 12 – Stock Award Plans to separately disclose the stock-based compensation expense related to the employee stock purchase plan from the expense for restricted stock units (“RSUs”) and stock options for 2019. In addition, changes were made to the consolidated statements of cash flows for 2019 to reclassify operating lease payments from operating lease liabilities to accrued expenses and other current liabilities. Segment Information — Operating segments are identified as components of an enterprise about which separate discrete financial information is available for evaluation by the chief operating decision-maker in making decisions regarding resource allocation and assessing performance. To date, the Company has viewed its operations and manages its business as one segment operating in the United States of America.

Description of Business

12 Months Ended

Dec. 31, 2020

1. Description of Business

Business — MannKind Corporation and its subsidiaries (the “Company”) is a biopharmaceutical company focused on the development and commercialization of inhaled therapeutic products for patients with endocrine and orphan lung diseases. The Company’s development team is capable of taking a compound from early formulation feasibility studies to a full commercial-scale manufacturing operation. The Company’s commercial team includes a specialty sales force that calls on endocrinologists and selected primary care physicians, as well as supporting functions that are directed to improving market access and delivering patient and physician support programs.

Basis of Presentation — The accompanying consolidated financial statements have been prepared assuming that the Company will continue as a going concern which contemplates the realization of assets and satisfaction of liabilities in the normal course of business. The Company is not currently profitable and has rarely generated positive net cash flow from operations. In addition, the Company expects to continue to incur significant expenditures for the foreseeable future in support of its manufacturing operations, sales and marketing costs for Afrezza, and development costs for product candidates in the Company’s pipeline. As of December 31, 2020, the Company had an accumulated deficit of $3.0 billion and $122.9 million of total principal amount of outstanding borrowings, with limited capital resources of $67.0 million in cash and cash equivalents. Further, the ongoing COVID-19 pandemic has adversely impacted the Company’s Afrezza net sales and could impact the ability to access capital and comply with covenants under debt covenants. These financial conditions raise substantial doubt about the Company’s ability to continue as a going concern.

In August 2019, the Company and its wholly owned subsidiaries, entered into a credit and security agreement with MidCap Financial Trust (as amended, the “MidCap Credit Facility”) to restructure its existing debts and to provide additional operating capital (the “recapitalization”) (Refer to Note 7 – Borrowings for further details). The MidCap Credit Facility provides a secured term loan facility with an aggregate principal amount of up to $75.0 million, of which $50.0 million was outstanding as of December 31, 2020. The remaining $25.0 million will be available to the Company between October 1, 2021 and March 31, 2022, subject to the satisfaction of certain milestone conditions associated with Tyvaso DPI through the Company’s collaboration with United Therapeutics (see Note 8 – Collaboration, Licensing and Other Arrangements for more information on the collaboration agreement with United Therapeutics).

Principal payments on the MidCap Credit Facility will begin in September 2022. Under the MidCap Credit Facility, the Company must comply with certain covenants, which includes requirements to maintain a minimum of $30.0 million of unrestricted cash and cash equivalents as well as meet certain minimum Afrezza net revenue trailing twelve-month thresholds, tested on a monthly basis.

The Company’s capital resources may not be sufficient to continue to meet its current and anticipated obligations, including the need to maintain compliance with its debt covenants, over the next twelve months if the Company cannot increase its operating cash inflows by growing its revenue or obtaining access to the remaining $25.0 million in borrowings that may become available under its MidCap Credit Facility. In the event these capital resources are not sufficient, the Company may need to raise additional capital by selling equity or debt securities, entering into strategic business collaboration agreements with other companies, seeking other funding facilities or licensing arrangements, selling assets or by other means. However, the Company cannot provide assurances that additional capital will be available on acceptable terms or at all.

If the Company is unable to meet its current and anticipated obligations over the next twelve months through its existing capital resources, or obtain new sources of capital when needed, the Company may have to reduce the scope of its commercial operations, reduce or eliminate one or more of its development programs, and/or make significant changes to its operating plan. These factors raise substantial doubt about the Company’s ability to continue as a going concern. The accompanying financial statements do not include any adjustments that might result from the outcome of this uncertainty.

Principles of Consolidation — The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. Intercompany balances and transactions have been eliminated. Certain prior year amounts have been reclassified for consistency with the current year presentation. Changes were made to Note 12 – Stock Award Plans to separately disclose the stock-based compensation expense related to the employee stock purchase plan from the expense for restricted stock units (“RSUs”) and stock options for 2019. In addition, changes were made to the consolidated statements of cash flows for 2019 to reclassify operating lease payments from operating lease liabilities to accrued expenses and other current liabilities.

Segment Information — Operating segments are identified as components of an enterprise about which separate discrete financial information is available for evaluation by the chief operating decision-maker in making decisions regarding resource allocation and assessing performance. To date, the Company has viewed its operations and manages its business as one segment operating in the United States of America.