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Summary of Product Revenues by Product Line (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 51,942 | $ 49,529 | $ 47,731 | $ 44,830 | $ 41,611 | $ 36,580 | $ 32,455 | $ 30,590 | $ 194,032 | $ 141,236 |  | $ 104,541 |
Chromatography products |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 45,326 | 36,309 | [1] | 29,520 | [2],[3]
Filtration products |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 90,586 | 49,050 | [1] | 19,774 | [2],[3]
Protein products |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 54,375 | 53,969 | [1] | 54,716 | [2],[3]
Other |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 3,604 | $ 1,761 | [1] | $ 431 | [2],[3]
[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 chromatography products includes revenue related to Atoll from April 1, 2016 through December 31, 2016.
[3] | 2016 revenue for filtration products includes revenue related to TangenX from December 14, 2016 through December 31, 2016.

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