(2) Includes amortization of acquired intangible assets as follows:

		Three Months Ended September 30,								Nine Months Ended September 30,
		2020				2021				2020				2021
						(in thousands)
Cost of revenue		$	761			$	1,086			$	2,283			$	3,258
Sales and marketing			404				404				1,212				1,349
Research and development			183				907				488				1,770
Total amortization of acquired intangible assets		$	1,348			$	2,397			$	3,983			$	6,377

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