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Revenue from Collaboration Agreement (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Revenue from Collaboration Agreement    
Bayer's obligation to pay royalties to the Company for sales of Nexavar $ 0  
Revenue from collaboration agreement    
Revenue from collaboration agreement 70,307 72,031
Nexavar | More than
   
Revenue from Collaboration Agreement    
Number of countries in which product is marketed and sold 100  
Bayer
   
Revenue from collaboration agreement    
Onyx's share of collaboration commercial profit 66,192 66,692
Reimbursement of Onyx's shared marketing expenses 4,115 5,339
Revenue from collaboration agreement $ 70,307 $ 72,031