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Subsequent Events - Additional Information (Detail) - License and Collaboration Agreement with Sanofi - USD ($)
$ in Millions
12 Months Ended
Feb. 10, 2016
Jan. 04, 2016
Aug. 11, 2014
Dec. 31, 2015
Subsequent Event [Line Items]        
Profits and losses sharing percentage     35.00% 35.00%
Sanofi-Aventis Deutschland GmbH        
Subsequent Event [Line Items]        
Profits and losses sharing percentage     65.00% 65.00%
Secured loan facility, amount borrowed       $ 44.5
Subsequent Event        
Subsequent Event [Line Items]        
Termination date   Jul. 04, 2016    
Subsequent Event | Sanofi-Aventis Deutschland GmbH        
Subsequent Event [Line Items]        
Secured loan facility, amount borrowed $ 17.9