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Major Customers, Partnerships and Strategic Alliances - Revenues Recognized under Agreement (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues:                      
Total $ 26,837 $ 23,562 $ 21,416 $ 12,637 $ 13,077 $ 11,812 $ 8,253 $ 3,425 $ 84,452 $ 36,567 $ 19,389
Collaboration Agreements [Member]                      
Revenues:                      
Total                 84,065 35,960 18,881
Bioverativ Inc [Member]                      
Revenues:                      
Total                 13,516 12,258 8,886
Bioverativ Inc [Member] | Collaboration Agreements [Member]                      
Revenues:                      
Total                 4,013 1,769 2,321
Bioverativ Inc [Member] | Research Services [Member]                      
Revenues:                      
Total                 $ 9,503 $ 10,489 $ 6,565