Summary of Product Revenues by Product Line (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Revenue		$ 69,474	$ 69,445	$ 70,692	$ 60,634	$ 51,942	$ 49,529	$ 47,731	$ 44,830	$ 270,245		$ 194,032	$ 141,236
Chromatography Products [Member]
Revenue from External Customer [Line Items]
Revenue										64,635	[1]	45,326	36,309	[2]
Filtration Products [Member]
Revenue from External Customer [Line Items]
Revenue										119,534	[1]	90,586	49,050	[2]
Process Analytics Products [Member]
Revenue from External Customer [Line Items]
Revenue	[1]									16,405
Proteins Products [Member]
Revenue from External Customer [Line Items]
Revenue										65,124	[1]	54,375	53,969	[2]
Other products [Member]
Revenue from External Customer [Line Items]
Revenue										4,399	[1]	3,604	1,761	[2]
Products
Revenue from External Customer [Line Items]
Revenue										$ 270,097	[1]	$ 193,891	$ 141,089	[2]

[1] 2019 revenue for process analytics products includes revenue related to C Technologies from May 31, 2019 through December 31, 2019.

[2] 2017 revenue for filtration, chromatography and other products includes revenue related to Spectrum from August 1, 2017 through December 31, 2017.