Goodwill and Intangible Assets

6 Months Ended

Jun. 30, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

6. Goodwill and Intangible Assets

The changes in the carrying amount of goodwill for the six months ended June 30, 2020 were as follows:

	Goodwill
	(in thousands)
Balance as of December 31, 2019	$	761,153
Goodwill acquired		15,311
Foreign currency translation		(1,279	)
Balance as of June 30, 2020	$	775,185

Intangible assets consisted of the following:

	June 30, 2020
	Weighted- Average Remaining Useful Life - Years		Gross Carrying Amount		Accumulated Amortization		Net
	(in thousands, except years)
Domain names		2.1	$	414	$	241	$	173
Acquired developed technology		3.1		167,988		92,715		75,273
Patents		5.4		19,860		8,021		11,839
			$	188,262	$	100,977	$	87,285

	December 31, 2019
	Weighted- Average Remaining Useful Life - Years		Gross Carrying Amount		Accumulated Amortization		Net
	(in thousands except years)
Domain names		2.6	$	5,414	$	5,200	$	214
Trademarks		—		3,072		3,072		—
Acquired developed technology		3.6		175,414		95,921		79,493
Customer relationships		—		2,172		2,172		—
Patents		5.9		19,710		7,296		12,414
			$	205,782	$	113,661	$	92,121

Amortization of intangible assets was $7.4 million and $9.0 million for the three months ended June 30, 2020 and 2019, respectively, and $15.4 million and $19.4 million for the six months ended June 30, 2020 and 2019, respectively.

As of June 30, 2020, the estimated intangible asset amortization expense for the next five years and thereafter is as follows:

	Estimated Amortization
	(in thousands)
Remainder of 2020	$	16,305
2021		27,925
2022		19,222
2023		15,258
2024		6,648
Thereafter		1,927
Total	$	87,285