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

		Three Months Ended June 30,								Six Months Ended June 30,
		2020				2021				2020				2021
						(in thousands)
Cost of revenue		$	761			$	1,086			$	1,522			$	2,172
Sales and marketing			404				466				808				945
Research and development			183				680				305				863
Total amortization of acquired intangible assets		$	1,348			$	2,232			$	2,635			$	3,980

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