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Description of Business and Significant Accounting Policies - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 10, 2020 USD ($) | Aug. 31, 2020 USD ($) Principal | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) Segment Contract | Dec. 31, 2019 USD ($) | Aug. 31, 2019 USD ($) | Aug. 06, 2019 USD ($) | Jul. 01, 2013 USD ($)
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  | $ (3,022,732,000) | $ (2,991,903,000) |  |  |
Principal amount |  |  |  | 122,600,000 |  |  |  |
Cash and cash equivalents |  |  |  | $ 52,398,000 | 29,906,000 |  |  |
Number of operating segment | Segment |  |  |  | 1 |  |  |  |
Proceeds from loans |  |  |  | $ 4,873,000 |  |  |  |
Short-term investments |  |  |  | 0 | 19,978,000 |  |  |
Long-term Investments |  |  |  | 0 |  |  |  |
Remaining milestone rights liability |  |  |  | 7,300,000 | 7,300,000 |  |  |
Liabilities for uncertain income tax positions |  |  |  | $ 0 |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Change in accounting principle, accounting standards update, adopted [true false] |  |  |  | true |  |  |  |
Change in accounting principle, accounting standards update, adopted date |  |  |  | Jan. 01, 2020 |  |  |  |
Change in accounting principle, accounting standards update, immaterial effect [true false] |  |  |  | true |  |  |  |
Commitment Asset | Other Expense |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Asset impairment |  |  | $ 1,900,000 |  |  |  |  |
Insulin |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Loss on purchase commitments |  |  |  | $ 94,800,000 | 92,000,000.0 |  |  |
Loss on purchase commitments, number of new contracts recognized | Contract |  |  |  | 0 |  |  |  |
Maximum | AFREZZA product sales |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Sales return right following product expiration in months |  |  |  | 12 months |  |  |  |
Minimum | AFREZZA product sales |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Sales return right following product expiration in months |  |  |  | 6 months |  |  |  |
Paycheck Protection Program Loan, CARES Act |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 4,900,000 |  |  |  |
Proceeds from loans | $ 4,900,000 |  |  |  |  |  |  |
Facility Financing Obligation | Deerfield |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Remaining milestone rights liability |  |  |  | 7,300,000 | 7,300,000 |  |  |
MidCap Credit Facility |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  |  | 40,000,000.0 | 40,000,000.0 |  |  |
Principal amount |  |  |  |  |  | $ 65,000,000.0 | $ 75,000,000.0 |
Amount outstanding |  |  |  | $ 40,000,000.0 | 40,000,000.0 |  |  |
Amount available under credit facility |  |  |  |  |  | 25,000,000.0 |  |
Minimum cash covenant |  |  |  |  |  |  | 15,000,000.0 |
Line of credit facility covenant terms |  |  |  | In August 2020, the Company entered into an amendment to the MidCap Credit Facility, pursuant to which the parties agreed that no breach of the minimum Afrezza net revenue covenant for any trailing twelve-month reporting period between July 31, 2020 and November 30, 2020 will be deemed to occur if the Company delivers satisfactory evidence that it had unrestricted cash of at least $40.0 million. Without this amendment, the Company would have been in violation of the minimum Afrezza net revenue covenant as of September 30, 2020. After the November 30, 2020 reporting period, the amendment will expire and a breach of the minimum Afrezza net revenue covenant is probable. The Company intends to amend the MidCap Credit Facility to address this probable covenant violation; however, such amendment, if completed, would occur after the date of this report. |  |  |  |
Outstanding principal |  |  |  | $ 39,346,000 | $ 38,851,000 |  |  |
Number of principal payments payable | Principal |  | 36 |  |  |  |  |  |
Line of credit facility principal payment start date |  | Sep. 01, 2021 |  |  |  |  |  |
Line of credit facility principal payment end date |  | Aug. 01, 2024 |  |  |  |  |  |
Commitment asset |  |  |  |  |  | 1,500,000 |  |
Other asset |  |  |  |  |  | 400,000 |  |
MidCap Credit Facility | Commitment Asset |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Asset impairment |  |  | $ 1,900,000 |  |  |  |  |
MidCap Credit Facility | Current Debt |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Outstanding principal |  |  |  | 40,000,000.0 |  |  |  |
MidCap Credit Facility | Tranche 2 |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Amount available under credit facility |  |  |  |  |  | 10,000,000.0 |  |
Minimum cash covenant |  |  |  | 15,000,000.0 |  |  |  |
MidCap Credit Facility | Tranche 3 |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Amount available under credit facility |  |  |  |  |  | $ 25,000,000.0 |  |
Minimum cash covenant |  |  |  | 20,000,000.0 |  |  | $ 20,000,000.0 |
MidCap Credit Facility | Tranche 1 |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Minimum cash covenant |  | $ 40,000,000.0 |  |  |  |  |  |
Milestone Rights Liability | Deerfield |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Contingent liability remain payable |  |  |  | $ 70,000,000.0 |  |  |  |
Milestone Rights Liability | Maximum | Deerfield |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |
Contingent liability for milestone payments |  |  |  |  |  |  |  | $ 90,000,000.0

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