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Goodwill and Intangible Assets, net - Narrative (Details) $ in Thousands, € in Millions	1 Months Ended	3 Months Ended				9 Months Ended
	Feb. 28, 2014 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 EUR (€)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2020 EUR (€)	Jan. 17, 2020 USD ($)	Dec. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 106,455				$ 106,455				$ 104,108
Amortization of intangibles						8,929	$ 8,400
DVS Sciences, Inc.
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 104,100
InstruNor AS
Finite-Lived Intangible Assets [Line Items]
Goodwill			$ 2,200					€ 2.0	$ 2,220
Developed technology
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles		$ 3,200			$ 3,000	$ 9,600	$ 9,200
Developed technology | DVS Sciences, Inc.
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 112,000
Developed technology | InstruNor AS
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired			$ 5,400	€ 4.9
Acquired finite-lived intangible assets, useful life			8 years	8 years

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