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Concentrations of Credit Risk (Details) (Revenue, Rights Granted [Member], Revenue from Rights Concentration Risk [Member])
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Bristol-Myers Squibb [Member]
     
Concentration Risk [Line Items]      
Concentration Risk, Percentage 66.00% 59.00% 50.00%
Merck [Member]
     
Concentration Risk [Line Items]      
Concentration Risk, Percentage 22.00% 0.00% 0.00%
Daiichi Sankyo [Member]
     
Concentration Risk [Line Items]      
Concentration Risk, Percentage 12.00% 0.00% 3.00%
Sanofi [Member]
     
Concentration Risk [Line Items]      
Concentration Risk, Percentage 0.00% 39.00% 42.00%