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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.

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