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Collaborative and Other Relationships Collaborative and Other Relationships - Collaboration Agreement (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2014
Eisai
Mar. 31, 2014
Sangamo BioSciences
Jan. 31, 2014
Isis Pharmaceuticals
Mar. 31, 2014
Research and development
Eisai
Jun. 30, 2014
JAPAN
Eisai
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                  
Total upfront and milestone payments         $ 100,000,000 $ 20,000,000      
Amount recorded to reflect fair value of options granted               17,700,000  
Milestone payments made during period                 35,000,000
Research and development 447,273,000 327,463,000 976,157,000 611,803,000   20,000,000 45,000,000   21,600,000
Additional milestone payment         $ 1,000,000,000 $ 300,000,000