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Summary of Significant Accounting Policies - Summary of Percentage of Significant Revenue (Detail) (Sales [Member])
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Servier [Member]
        
Concentration Risk [Line Items]        
Percentage of all significant revenue earned 71.30% 14.20% 58.80% 12.60%
Boehringer [Member]
        
Concentration Risk [Line Items]        
Percentage of all significant revenue earned 11.50% 15.60% 15.90% 17.20%
Gilead [Member]
        
Concentration Risk [Line Items]        
Percentage of all significant revenue earned 10.90% 0.00% 13.70% 0.00%
Pfizer [Member]
        
Concentration Risk [Line Items]        
Percentage of all significant revenue earned 4.50% 7.70% 7.30% 7.40%
Government Agencies [Member]
        
Concentration Risk [Line Items]        
Percentage of all significant revenue earned 0.60% 3.50% 2.60% 6.90%
Eli Lilly [Member]
        
Concentration Risk [Line Items]        
Percentage of all significant revenue earned 0.90% 59.00% 1.60% 55.70%