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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  |
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Dec. 31, 2019 USD ($) Distributor | Dec. 31, 2018 USD ($) Distributor | Jan. 01, 2019 USD ($) | Jul. 01, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of wholesale distributors | Distributor | 3 | 3 |  |
Percentage of sales from major wholesale distributors | 96.00% | 89.00% |  |
Asset impairments | $ 0 | $ 0 |  |
Liabilities for uncertain income tax positions | 0 | 0 |  |
(“ASC”) Topic 842 – Leases |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Increase in total assets and total liabilities |  |  | $ 5,200,000 |
Deerfield | Facility Financing Obligation |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Remaining milestone rights liability | 7,300,000 | 8,900,000 |  |
Milestone Rights Liability | Deerfield |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Contingent liability remain payable | 70,000,000 |  |  |
Cost of Goods Sold |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Purchase commitments, amendment fees | 2,800,000 | 2,000,000 |  |
Insulin |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Loss on purchase commitments | $ 92,000,000 | $ 98,300,000 |  |
Minimum | AFREZZA product sales |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Sales return right following product expiration in months | 6 months |  |  |
Maximum | Milestone Rights Liability | Deerfield |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Contingent liability for milestone payments |  |  |  | $ 90,000,000
Maximum | AFREZZA product sales |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Sales return right following product expiration in months | 12 months |  |  |

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