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Collaboration Agreement - Collaboration Revenue and Collaboration Receivables - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Collaboration revenue percentage of U.S. XTANDI net sales 50.00% 50.00% 50.00% 50.00%
Amortization of deferred upfront and development milestones   $ 846   $ 2,257
Astellas Pharma Inc. [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Development cost-sharing payments $ 15,100 17,600 $ 28,400 31,400
Commercialization cost-sharing payments $ 4,500 2,700 $ 23,300 22,800
Astellas Pharma Inc. [Member] | Amortization of deferred upfront and development milestones [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Amortization of deferred upfront and development milestones   $ 846   $ 2,257
Development cost-sharing payments [Member] | Collaborative agreement [Member] | Medivation Inc [Member] | U.S. [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Share of XTANDI development and commercialization costs     50.00%  
Development cost-sharing payments [Member] | Collaborative agreement [Member] | Medivation Inc [Member] | ex-U.S. [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Share of XTANDI development and commercialization costs     33.33%  
Commercial cost sharing-payments [Member] | Astellas Pharma Inc. [Member] | Collaborative agreement [Member] | U.S. [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Share of XTANDI development and commercialization costs     50.00%  
Commercial cost sharing-payments [Member] | Astellas Pharma Inc. [Member] | Collaborative agreement [Member] | ex-U.S. [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Share of XTANDI development and commercialization costs     66.67%