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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