Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 2019

5. Goodwill and Intangible Assets

The changes in the carrying amount of goodwill for the three months ended March 31, 2019 were as follows:

	Goodwill
	(in thousands)
Balance as of December 31, 2018	$	632,370
Foreign currency translation		(2,774	)
Balance as of March 31, 2019	$	629,596

Intangible assets consisted of the following:

	March 31, 2019
	Weighted- Average Remaining Useful Life - Years		Gross Carrying Amount		Accumulated Amortization		Net
	(in thousands, except years)
Domain names		1.5	$	5,414	$	4,554	$	860
Trademarks		1.2		5,772		4,407		1,365
Acquired developed technology		3.6		179,330		86,899		92,431
Customer relationships		2.0		15,572		8,893		6,679
Patents		6.6		19,710		5,659		14,051
			$	225,798	$	110,412	$	115,386

	December 31, 2018
	Weighted- Average Remaining Useful Life - Years		Gross Carrying Amount		Accumulated Amortization		Net
	(in thousands except years)
Domain names		1.6		5,414	$	4,283	$	1,131
Trademarks		1.4		5,772		4,076		1,696
Acquired developed technology		3.8		179,791		78,729		101,062
Customer relationships		2.1		15,572		8,012		7,560
Patents		6.9		19,710		5,105		14,605
			$	226,259	$	100,205	$	126,054

Amortization of intangible assets was $10.4 million and $10.8 million for the three months ended March 31, 2019 and 2018, respectively.

As of March 31, 2019, the estimated intangible asset amortization expense for the next five years and thereafter is as follows: