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Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 2021

6. Goodwill and Intangible Assets

The changes in the carrying amount of goodwill for the three months ended March 31, 2021 were as follows:

	Goodwill
	(in thousands)
Balance as of December 31, 2020	$	939,259
Goodwill acquired		93,913
Foreign currency translation		(7,462	)
Balance as of March 31, 2021	$	1,025,710

Intangible assets consisted of the following:

	March 31, 2021
	Weighted- Average Remaining Useful Life - Years		Gross Carrying Amount		Accumulated Amortization		Net
	(in thousands, except years)
Domain names		1.4	$	414	$	303	$	111
Trademarks		3.0		800		11		789
Acquired developed technology		3.3		205,470		101,249		104,221
Customer relationships		8.0		17,000		89		16,911
Patents		4.7		20,145		9,694		10,451
			$	243,829	$	111,346	$	132,483

	December 31, 2020
	Weighted- Average Remaining Useful Life - Years		Gross Carrying Amount		Accumulated Amortization		Net
	(in thousands except years)
Domain names		1.6	$	414	$	283	$	131
Acquired developed technology		3.2		206,197		111,129		95,068
Patents		4.9		19,860		9,130		10,730
			$	226,471	$	120,542	$	105,929

Amortization of intangible assets was $10.4 million and $8.0 million for the three months ended March 31, 2021 and 2020, respectively.

As of March 31, 2021, the estimated intangible asset amortization expense for the next five years and thereafter is as follows: