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Collaboration Agreement - Collaboration Agreements with Astellas - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2014
Collaborative agreement [Member]
Jun. 30, 2014
Scenario, Forecast [Member]
Mar. 31, 2014
Astellas Pharma Inc. [Member]
Collaborative agreement [Member]
Dec. 31, 2009
Up-front cash payment arrangement [Member]
Astellas Pharma Inc. [Member]
Mar. 31, 2014
Development milestone payments [Member]
Astellas Pharma Inc. [Member]
Jun. 30, 2014
Development milestone payments [Member]
Astellas Pharma Inc. [Member]
Scenario, Forecast [Member]
Mar. 31, 2014
Sales milestone payments [Member]
Astellas Pharma Inc. [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Co-promotion of sales and medical affairs percentage   50.00%            
Royalty received on ex-U.S. sales per collaboration arrangement       Low teens to the low twenties        
Non-refundable, up-front cash payment         $ 110.0      
Eligible to receive milestone payments           335.0   320.0
Milestone payments earned           93.0   25.0
Remaining future sales milestone payments the Company is eligible to receive               295.0
Remaining future development milestone payments the Company is eligible to receive           242.0    
Collaboration revenue $ 78.0   $ 7.0       $ 47.0  
Percentage of Sublicensing Income           10.00%