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Summary of Product Revenues by Product Line (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue from External Customer [Line Items]                      
Product revenue $ 41,572 $ 36,514 $ 32,434 $ 30,569 $ 25,500 $ 24,677 $ 29,170 $ 25,094 $ 141,089 $ 104,441 $ 83,537
Protein products                      
Revenue from External Customer [Line Items]                      
Product revenue                 53,969 54,716 52,938
Filtration products                      
Revenue from External Customer [Line Items]                      
Product revenue                 49,050 [1] 19,774 [2] 15,676
Chromatography products                      
Revenue from External Customer [Line Items]                      
Product revenue                 36,309 [1] 29,520 [3] 14,613
Other                      
Revenue from External Customer [Line Items]                      
Product revenue                 $ 1,761 [1] $ 431 $ 310
[1] 2017 revenue for filtration, chromatography and other products includes revenue related to Spectrum from August 1, 2017 through December 31, 2017.
[2] 2016 revenue for filtration products includes revenue related to TangenX from December 14, 2016 through December 31, 2016.
[3] 2016 revenue for chromatography products includes revenue related to Atoll from April 1, 2016 through December 31, 2016.