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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |
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Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Distributor | Dec. 31, 2017 USD ($) Distributor | Dec. 31, 2016 USD ($) | Jan. 01, 2018 USD ($) | Jul. 01, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net deferred revenue |  |  |  |  | $ 3,038,000 |  |  |  |  | $ 3,038,000 |  |  |
Revenue | $ 16,031,000 | $ 4,469,000 | $ 3,893,000 | $ 3,465,000 | 4,530,000 | $ 2,043,000 | $ 2,163,000 | $ 3,009,000 | $ 27,859,000 | $ 11,745,000 | $ 174,758,000 |  |
Number of wholesale distributors | Distributor |  |  |  |  |  |  |  |  | 3 | 3 |  |  |
Percentage of product shipments to wholesale distributors |  |  |  |  |  |  |  |  | 89.00% | 89.00% |  |  |
Deferred costs from commercial product sales |  |  |  |  | 405,000 |  |  |  |  | $ 405,000 |  |  |
Current deferred payment | 36,885,000 |  |  |  | 250,000 |  |  |  | $ 36,885,000 | 250,000 |  |  |
Long-term deferred payment | 10,680,000 |  |  |  | 500,000 |  |  |  | $ 10,680,000 | $ 500,000 |  |  |
Maturity period of cash equivalents |  |  |  |  |  |  |  |  | 90 days or less at the time of purchase | 90 days from the date of purchase |  |  |
Inventory charge |  |  |  |  |  |  |  |  | $ 2,212,000 | $ 2,971,000 | 0 |  |
Prepaid expenses and other current assets | 2,556,000 |  |  |  | 3,010,000 |  |  |  | $ 2,556,000 | 3,010,000 |  |  |
Long-lived assets anticipated sale in year |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Asset impairment charge |  |  |  |  |  |  |  |  |  | 200,000 | 1,300,000 |  |
Purchase commitment obligation | 98,300,000 |  |  |  | 109,300,000 |  |  |  | $ 98,300,000 | 109,300,000 |  |  |
Liability for uncertainty in income taxes | 0 |  |  |  |  |  |  |  | 0 |  |  |  |
Interest cost capitalized |  |  |  |  |  |  |  |  | 0 | 0 |  |  |
Increase of assets and liabilities arising from operating leases upon adoption of ASU | 5,000 |  |  |  |  |  |  |  | 5,000 |  |  |  |
Milestone Rights Liability | Deerfield |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability for milestone payments, remain payable amount | 75,000,000 |  |  |  |  |  |  |  | 75,000,000 |  |  |  |
Milestone Rights Liability | Deerfield | 2019 notes |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long term liability | 8,900,000 |  |  |  | 8,900,000 |  |  |  | 8,900,000 | 8,900,000 |  |  |
Certificates of Deposit |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets | 400,000 |  |  |  | 400,000 |  |  |  | 400,000 | 400,000 |  |  |
Intellectual property |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 600,000 |  |  |
Maximum | Milestone Rights Liability | Deerfield |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability for milestone payments | 90,000,000 |  |  |  |  |  |  |  | 90,000,000 |  |  |  | $ 90,000,000
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred costs from commercial product sales |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
AFREZZA product sales |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net deferred revenue |  |  |  |  | 3,000,000 |  |  |  |  | 3,000,000 |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 17,276,000 | 9,192,000 | 1,895,000 |  |
AFREZZA product sales | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales return right following product expiration in months |  |  |  |  |  |  |  |  | 6 months |  |  |  |
AFREZZA product sales | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales return right following product expiration in months |  |  |  |  |  |  |  |  | 12 months |  |  |  |
AFREZZA product sales | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net deferred revenue | 0 |  |  |  |  |  |  |  | $ 0 |  |  |  |
Collaborations and services |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 10,583,000 | 250,000 | $ 171,965,000 |  |
Current deferred payment | 36,900,000 |  |  |  | 200,000 |  |  |  | 36,900,000 | 200,000 |  |  |
Long-term deferred payment | $ 10,700,000 |  |  |  | $ 500,000 |  |  |  | $ 10,700,000 | 500,000 |  |  |
Bulk insulin sales |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ 1,700,000 |  |  |

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