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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Percentage of sublicensing income     10.00%    
Collaboration revenue percentage compared to U.S. XTANDI net sales 50.00% 50.00% 50.00% 50.00%  
Collaboration revenue related to ex-U.S. XTANDI net sales $ 25,600 $ 10,000 $ 41,400 $ 15,700  
Deferred revenue, Current 565   565   $ 2,822
Collaborative agreement [Member]          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Deferred revenue, Current 600   $ 600   $ 2,800
Development cost-sharing payments [Member] | Collaborative agreement [Member] | Medivation Inc [Member]          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Share of developing and commercializing XTANDI U.S.     50.00%    
Share of developing and commercializing XTANDI ex-U.S.     33.33%    
Development cost-sharing payments [Member] | Astellas Pharma Inc. [Member]          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Development cost-sharing payments 17,600 17,500 $ 31,400 33,400  
Commercial cost sharing-payments [Member] | Astellas Pharma Inc. [Member]          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Commercialization cost-sharing payments $ 2,700 $ 2,600 $ 22,800 $ 10,200  
Commercial cost sharing-payments [Member] | Astellas Pharma Inc. [Member] | Collaborative agreement [Member]          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Share of developing and commercializing XTANDI U.S.     50.00%    
Share of developing and commercializing XTANDI ex-U.S.     66.67%