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Description of Business and Significant Accounting Policies - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
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Mar. 01, 2017 | Jun. 30, 2018 USD ($) Distributor | Mar. 31, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Distributor Contract | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) Distributor Contract | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($)
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Accumulated deficit |  | $ (2,906,085,000) |  |  | $ (2,906,085,000) |  | $ (2,854,898,000) |  |
Cash and cash equivalents |  | 26,178,000 |  |  | 26,178,000 |  | 43,946,000 |  |
Principal amount of outstanding borrowings |  | $ 129,200,000 |  |  | $ 129,200,000 |  |  |  |
Stock split of common stock | 0.2 |  |  |  |  |  |  |  |
Reverse stock split, description |  |  |  |  | The Company’s board of directors approved a 1-for-5 reverse stock split of the Company’s outstanding common stock. On March 1, 2017, the Company filed with the Secretary of State of the State of Delaware a Certificate of Amendment of the Company’s Amended and Restated Certificate of Incorporation (the “Charter Amendment”) to effect the 1-for-5 reverse stock split of the Company’s outstanding common stock (the “Reverse Stock Split”) . The Company’s common stock began trading on the Nasdaq Global Market on a split-adjusted basis when the market opened on March 3, 2017. As a result, prior to March 3, 2017, all common stock share amounts included in these condensed consolidated financial statements have been retroactively reduced by a factor of five, and all common stock per share amounts have been increased by a factor of five, with the exception of the Company’s common stock par value. |  |  |  |
Net deferred revenue |  |  |  |  |  |  | $ 3,038,000 |  |
Number of wholesale distributors | Distributor |  | 3 |  |  | 3 |  | 3 |  |
Percentage of product shipments to wholesale distributors |  | 89.00% |  | 93.00% | 88.00% | 93.00% |  |  |
Revenue - other |  | $ 3,893,000 |  | $ 2,163,000 | $ 7,358,000 | $ 5,172,000 |  |  |
Loss on purchase commitments |  |  |  |  | $ 101,500,000 |  |  |  |
Loss on purchase commitments, number of new contracts recognized | Contract |  |  |  |  | 0 |  | 0 |  |
Change in net revenue |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Reduction to net revenue |  |  | $ 400,000 |  |  |  |  |  |
Third party logistics |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Net deferred revenue |  |  |  |  |  |  | $ 1,500,000 |  |
AFREZZA product sales |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Percentage of estimated products returned |  | 2.46% |  |  | 2.46% |  |  |  |
Revenue - other |  | $ 3,753,000 |  | 1,548,000 | $ 7,155,000 | 2,745,000 |  |  |
Bulk insulin sales and sale of intellectual property |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Revenue - other |  |  |  | $ 600,000 |  | $ 2,300,000 |  |  |
Tranche B Notes |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Senior notes, effective interest rate |  | 8.75% |  |  | 8.75% |  |  |  |
Principal amount of outstanding borrowings |  | $ 7,000,000 |  |  | $ 7,000,000 |  |  |  |
Senior convertible notes due December 31, 2019 |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Senior notes, effective interest rate |  | 9.75% |  |  | 9.75% |  |  |  |
Principal amount of outstanding borrowings |  | $ 32,000,000 |  |  | $ 32,000,000 |  |  |  |
Senior convertible notes due December 31, 2019 | Tranche B Notes |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of outstanding borrowings |  | 39,000,000 |  |  | 39,000,000 |  | $ 54,407,000 |  |
Deerfield | Tranche B Notes |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of outstanding borrowings |  | $ 20,000,000 |  |  | $ 20,000,000 |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Senior notes, effective interest rate |  | 9.75% |  |  | 9.75% |  |  |  |
Principal amount of outstanding borrowings |  | $ 120,000,000 |  |  | $ 120,000,000 |  |  |  |
Deerfield | Senior convertible notes due December 31, 2019 | Tranche B Notes |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Available amount of credit facility under covenant restrictions for each quarter end after current fiscal |  | $ 25,000,000 |  |  | $ 25,000,000 |  |  |  |
Senior notes, effective interest rate |  | 8.75% |  |  | 8.75% |  |  |  |
Minimum | AFREZZA product sales |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Sales return right following product expiration in months |  |  |  |  | 6 months |  |  |  |
Minimum | Deerfield | Senior convertible notes due December 31, 2019 | Tranche B Notes |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Available amount of credit facility under covenant restrictions |  | $ 20,000,000 | $ 20,000,000 |  | $ 20,000,000 |  |  |  |
Minimum | Deerfield | Scenario Forecast | Senior convertible notes due December 31, 2019 | Tranche B Notes |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Available amount of credit facility under covenant restrictions |  |  |  |  |  |  |  | $ 20,000,000 | $ 20,000,000
Maximum | AFREZZA product sales |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Sales return right following product expiration in months |  |  |  |  | 12 months |  |  |  |

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