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Major Customers, Partnerships and Strategic Alliances - Revenues Recognized under Agreement (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Bioverativ Inc [Member]      
Revenues:      
Recognition of upfront fee $ 1,769,000 $ 2,321,000 $ 6,176,000
Royalty revenues 0    
Research services 10,489,000 6,565,000 7,769,000
Total 12,258,000 8,886,000 13,945,000
Shire AG [Member]      
Revenues:      
Recognition of upfront fee 2,333,000 2,181,000 2,167,000
Research services 116,000 1,096,000 13,584,000
Total 2,449,000 3,277,000 15,751,000
Sigma-Aldrich Corporation [Member]      
Revenues:      
Royalty revenues 452,000 137,000 390,000
License fee revenues 267,000 1,140,000 4,463,000
Total $ 719,000 $ 1,277,000 $ 4,853,000