Revenue from Significant Customers (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Revenue	$ 108,648	$ 94,060	$ 87,462	$ 76,090	$ 69,474	$ 69,445	$ 70,692	$ 60,634	$ 366,260	$ 270,245	$ 194,032
MilliporeSigma
Concentration Risk [Line Items]
Revenue									$ 39,511	36,190	29,843
Cytiva (formerly GE Healthcare)
Concentration Risk [Line Items]
Revenue										$ 31,441	$ 29,616