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Major Customers, Partnerships and Strategic Alliances - Revenues Recognized under Agreement (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Bioverativ Inc [Member]        
Revenues:        
Recognition of upfront fee $ 442,000 $ 607,000 $ 1,326,000 $ 1,823,000
Royalty revenues     0  
Research services 2,959,000 1,238,000 7,736,000 5,163,000
Total 3,401,000 1,845,000 9,062,000 6,986,000
Shire AG [Member]        
Revenues:        
Recognition of upfront fee 1,166,000 542,000 2,333,000 1,625,000
Research services 6,000 165,000 116,000 957,000
Total 1,172,000 707,000 2,449,000 2,582,000
Sigma-Aldrich Corporation [Member]        
Revenues:        
Royalty revenues 18,000 42,000 68,000 103,000
License fee revenues   7,000 267,000 77,000
Total $ 18,000 $ 49,000 $ 335,000 $ 180,000