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Summary of Product Revenues by Product Line (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenue | $ 25,500 | $ 24,677 | $ 29,170 | $ 25,094 | $ 21,449 | $ 19,814 | $ 21,457 | $ 20,816 | $ 104,441 |  | $ 83,537 | $ 60,431 |
Protein products |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 54,716 |  | 52,938 | 43,674 |
Filtration products |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 19,774 | [1] | 15,676 | 6,739 | [2]
Chromatography products |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 29,520 | [3] | 14,613 | 9,811 |
Other |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | $ 431 |  | $ 310 | $ 207 |
[1] | 2016 revenue for filtration products includes revenue related to the TangenX Acquisition from December 14, 2016 through December 31, 2016.
[2] | 2014 revenue for filtration products includes revenue related to the Refine Acquisition from June 2, 2014 through December 31, 2014.
[3] | 2016 revenue for chromatography products includes revenue related to the Atoll Acquisition from April 1, 2016 through December 31, 2016.

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