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Commitments and Contingencies - Additional Information (Detail) $ / shares in Units, € in Millions |  |  |  | 1 Months Ended | 9 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 23, 2017 shares | Sep. 29, 2017 USD ($) shares | May 05, 2017 USD ($) | May 31, 2016 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) | Sep. 30, 2017 EUR (€) | Oct. 01, 2018 USD ($) | Oct. 03, 2017 shares | Jul. 01, 2013 USD ($)
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Purchase commitment amount under Insulin Supply Agreement | € |  |  |  |  |  | € 93.0 |  |  |
Supply Agreement expiration period |  |  |  |  | Dec. 31, 2023 | Dec. 31, 2023 |  |  |
Supply Agreement renewal period |  |  |  |  | 2 years | 2 years |  |  |
Fair value of shares sold with warrants |  |  |  | $ 44,700,000 | $ 11,000,000 |  |  |  |
Exercise price of warrants | $ / shares |  |  |  | $ 7.50 |  |  |  |  |
Number of warrant holders | shares |  | 4 |  |  |  |  |  |  |
Reclassification of warrant liability to additional paid-in capital |  | $ 1,900,000 |  |  | 1,893,000 |  |  |  |
Common Stock | Subsequent Event |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | shares | 973,236 |  |  |  |  |  |  |  |
Shares issuable under warrants granted | shares |  |  |  |  |  |  |  | 1,292,510 |
A Warrants |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Warrants expiration date |  |  |  | 2018-05 |  |  |  |  |
B Warrants |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Warrants expiration date |  |  |  | 2018-11 |  |  |  |  |
Warrants exercisable date |  |  |  | 2017-05 |  |  |  |  |
Registered Offering |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | shares |  |  |  | 9,708,737 |  |  |  |  |
Maximum | A Warrants |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Warrants to purchase of common stock | shares |  |  |  | 7,281,553 |  |  |  |  |
Maximum | B Warrants |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Warrants to purchase of common stock | shares |  |  |  | 2,427,184 |  |  |  |  |
Scenario Forecast |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Purchase commitment cancellation fees |  |  |  |  |  |  | $ 3,400,000 |  |
Scenario Forecast | Before Amendment |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Purchase commitment cancellation fees |  |  |  |  |  |  | $ 5,300,000 |  |
Supply Commitment |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Purchase commitment obligation |  |  |  |  | 500,000 |  |  |  |
Deerfield | Milestone Rights Liability | Maximum |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Contingent liability for milestone payments |  |  |  |  | $ 90,000,000 |  |  |  | $ 90,000,000
Russell Ranch Road II LLC [Member] |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Lease monthly rental payments |  |  | $ 40,951 |  |  |  |  |  |
Percentage of annual increase in lease payment |  |  | 3.00% |  |  |  |  |  |
Lease expiration date |  |  | Dec. 31, 2022 |  |  |  |  |  |
Lease renewal option |  |  | 5 years |  |  |  |  |  |

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