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Collaborations (Novartis Pharma AG) (Details) - Novartis Pharma AG [Member] - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 30, 2017
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Revenue recognition, milestone method, potential future milestone payment       $ 400,000,000
Research and development [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Cost recoveries $ 124,000,000 $ 33,000,000 $ 6,000,000  
License fee     $ 30,000,000  
Other revenues [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Revenue recognition, milestone method, revenue recognized $ 60,000,000