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Commitments and Contingencies - Additional Information (Detail)
€ in Millions
Jul. 31, 2014
EUR (€)
Sep. 30, 2015
EUR (€)
Jul. 01, 2013
USD ($)
Commitments and Contingencies [Line Items]      
Purchase commitment amount under Insulin Supply Agreement € 120.1    
Remaining purchase commitment obligation under Insulin Supply Agreement   € 99.0  
Deerfield | Milestone Rights Liability | Maximum      
Commitments and Contingencies [Line Items]      
Contingent liability for milestone payments | $     $ 90,000,000