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Collaboration Arrangements - Additional Information (Detail) - USD ($) $ in Millions |  |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
May 08, 2018 | Dec. 30, 2016 | Jan. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2016
Sanofi-Aventis Deutschland GmbH | Put Option |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Payment for insulin put option |  |  | $ 30.6 |  |
Distribution Agreement | Foreign Country | India Tax Authority |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Income Taxes Paid |  |  |  | $ 0.2 |
Distribution Agreement | Cipla Ltd |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Marketing and distribution agreement date | May 08, 2018 |  |  |  |
Deferred revenue - nonrefundable license fee | $ 2.2 |  |  |  |
Deferred revenue recognition period |  |  |  | 15 years |
Collaboration and License Agreement | Receptor |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Deferred revenue - nonrefundable license fee |  |  |  |  | $ 1.0
Deferred revenue recognition period |  |  |  | 4 years |
Nonrefundable option exercise and license fee |  | $ 1.0 |  |  |
Deferred payments from collaboration |  |  |  | $ 0.7 |
Deferred payments from collaboration, current |  |  |  | $ 0.3 |

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