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Major Customers, Partnerships and Strategic Alliances - Revenues Recognized under Agreement (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Biogen Inc [Member]        
Revenues:        
Recognition of upfront fee $ 1,540,000 $ 1,540,000 $ 3,063,000 $ 2,200,000
Royalty revenues     0  
Research services 1,701,000 1,338,000 3,233,000 1,761,000
Total 3,241,000 2,878,000 6,296,000 3,961,000
Shire AG [Member]        
Revenues:        
Recognition of upfront fee 542,000 542,000 1,083,000  
Royalty revenues     0  
Research services 3,894,000 5,930,000 10,910,000  
Total 4,436,000 6,472,000 11,993,000  
Sigma-Aldrich Corporation [Member]        
Revenues:        
Recognition of upfront fee     5,000,000  
Royalty revenues 28,000 97,000 293,000 203,000
License fee revenues 21,000   4,277,000 179,000
Total $ 49,000 $ 97,000 $ 4,570,000 $ 382,000