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Major Customers, Partnerships and Strategic Alliances - Revenues Recognized under Agreement (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Biogen Inc [Member]        
Revenues:        
Recognition of upfront fee $ 607,000 $ 1,556,000 $ 1,823,000 $ 4,619,000
Royalty revenues     0  
Research services 1,238,000 2,594,000 5,163,000 5,827,000
Total 1,845,000 4,150,000 6,986,000 10,446,000
Shire AG [Member]        
Revenues:        
Recognition of upfront fee 542,000 542,000 1,625,000 1,625,000
Research services 165,000 3,313,000 957,000 11,729,000
Total 707,000 3,855,000 2,582,000 13,354,000
Sigma-Aldrich Corporation [Member]        
Revenues:        
Royalty revenues 42,000 97,000 103,000 390,000
License fee revenues 7,000 172,000 77,000 4,449,000
Total $ 49,000 $ 269,000 $ 180,000 $ 4,839,000