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Summary of Product Revenues by Product Line (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

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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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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