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Collaboration Agreements - Accounting for the Astellas Agreements - Additional Information 2 (Detail) - Astellas Agreement [Member] - USD ($)
$ in Millions
1 Months Ended 9 Months Ended 35 Months Ended 45 Months Ended 114 Months Ended
Apr. 30, 2006
Jun. 30, 2005
Sep. 30, 2015
Feb. 28, 2009
Feb. 28, 2009
Sep. 30, 2015
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Upfront, non-contingent and time-based payments received         $ 360.1  
Minimum [Member]            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Discount rate applied     17.50%      
Maximum [Member]            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Discount rate applied     20.00%      
Europe [Member]            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Upfront, non-contingent and time-based payments received       $ 320.0    
Development costs           $ 119.8
Non-contingent performance period 36 months          
Total potential milestones $ 425.0          
Europe [Member] | Clinical and Development Milestone [Member]            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Substantive milestones 90.0          
Europe [Member] | Regulatory Milestone [Member]            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Substantive milestones 335.0          
Europe [Member] | Marketing approval milestone [Member]            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Substantive milestones $ 25.0          
Japan [Member]            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Upfront, non-contingent and time-based payments received         $ 40.1  
Total potential milestones   $ 132.5        
Commercial sales milestone   15.0        
Japan [Member] | Clinical and Development Milestone [Member]            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Substantive milestones   22.5        
Japan [Member] | Regulatory Milestone [Member]            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Substantive milestones   $ 95.0