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Major Customers, Partnerships and Strategic Alliances - Revenues Recognized under Agreement (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Biogen Inc [Member]        
Revenues:        
Recognition of upfront fee $ 608,000 $ 1,540,000 $ 1,216,000 $ 3,063,000
Royalty revenues     0  
Research services 1,894,000 1,701,000 3,925,000 3,233,000
Total 2,502,000 3,241,000 5,141,000 6,296,000
Shire AG [Member]        
Revenues:        
Recognition of upfront fee 541,000 542,000 1,083,000 1,083,000
Research services 363,000 3,894,000 792,000 8,416,000
Total 904,000 4,436,000 1,875,000 9,499,000
Sigma-Aldrich Corporation [Member]        
Revenues:        
Royalty revenues 49,000 28,000 61,000 293,000
License fee revenues 63,000 21,000 70,000 4,277,000
Total $ 112,000 $ 49,000 $ 131,000 $ 4,570,000