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Revenue from Significant Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Concentration Risk [Line Items]
Revenue	$ 87,462	$ 70,692	$ 163,552	$ 131,326
Cytiva (formerly GE Healthcare)
Concentration Risk [Line Items]
Revenue	10,479	11,083	16,606	18,749
MilliporeSigma
Concentration Risk [Line Items]
Revenue	$ 10,674	$ 9,487	$ 21,566	$ 18,894

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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