Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

6. Goodwill and Intangible Assets

The changes in the carrying amount of goodwill for the nine months ended September 30, 2021 were as follows:

	Goodwill
	(in thousands)
Balance as of December 31, 2020	$	939,259
Goodwill acquired		554,660
Foreign currency translation		(9,811	)
Balance as of September 30, 2021	$	1,484,108

Intangible assets consisted of the following:

	September 30, 2021
	Weighted- Average Remaining Useful Life - Years		Gross Carrying Amount		Accumulated Amortization		Net
	(in thousands, except years)
Domain names		0.9	$	414	$	344	$	70
Trademarks		4.6		21,384		1,517		19,867
Technology		3.7		307,987		127,150		180,837
Customer relationships		5.3		53,708		3,665		50,043
Patents		4.2		21,195		10,881		10,314
			$	404,688	$	143,557	$	261,131

	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
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 $18.1 million and $8.4 million for the three months ended September 30, 2021 and 2020, respectively, and $43.0 million and $23.8 million for the nine months ended September 30, 2021 and 2020, respectively.

As of September 30, 2021, the estimated intangible asset amortization expense for the next five years and thereafter is as follows:

	Estimated Amortization
	(in thousands)
Remainder of 2021	$	18,977
2022		70,174
2023		64,192
2024		52,542
2025		36,486
Thereafter		18,760
Total	$	261,131