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Summary of Carrying Values Estimated Fair Values of Notes and Facility Financing Obligation and Sanofi Loan Facility (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sanofi-Aventis Deutschland GmbH    
Convertible Debt [Line Items]    
Carrying value $ 28,900 $ 3,000
Estimated fair value 28,900 3,000
Senior convertible notes due August 15, 2018    
Convertible Debt [Line Items]    
Carrying value 27,607  
Senior convertible notes due August 15, 2018 | Convertible Debt Securities    
Convertible Debt [Line Items]    
Carrying value 27,600  
Estimated fair value 28,400  
Facility financing obligation    
Convertible Debt [Line Items]    
Carrying value 74,200 73,000
Estimated fair value $ 78,700 $ 75,100