Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill consists of the following (in thousands):



	Years Ended December 31,
	2019			2018
Beginning balance	$	149,524		$	125,272
Additions due to acquisitions	65,181			24,673
Foreign currency translation adjustment	(192		)	(421		)
Ending balance	$	214,513		$	149,524

Intangible assets as of December 31, 2019 and December 31, 2018 consist of the following (in thousands, except weighted-average amortization period):



	December 31, 2019
	Weighted-Average Amortization Period (in months)	Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount
Developed technologies and content library	66	$	43,268		$	(18,395	)	$	24,873
Customer lists	47	9,970			(8,210		)	1,760
Trade and domain names	46	10,873			(6,169		)	4,704
Non-compete agreements	31	2,018			(1,890		)	128
Indefinite-lived trade name	—	3,600			—			3,600
Foreign currency translation adjustment	—	(398		)	—			(398		)
Total intangible assets	58	$	69,331		$	(34,664	)	$	34,667



	December 31, 2018
	Weighted-Average Amortization Period (in months)	Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount
Developed technologies and content library	71	$	31,667		$	(13,737	)	$	17,930
Customer lists	47	9,970			(6,847		)	3,123
Trade and domain names	44	6,113			(4,863		)	1,250
Non-compete agreements	31	2,018			(1,735		)	283
Indefinite-lived trade name	—	3,600			—			3,600
Foreign currency translation adjustment	—	(271		)	—			(271		)
Total intangible assets	61	$	53,097		$	(27,182	)	$	25,915

During the years ended December 31, 2019, 2018 and 2017, amortization expense related to our acquired intangible assets totaled approximately $7.5 million, $6.5 million and $5.5 million, respectively.

As of December 31, 2019, the estimated future amortization expense related to our finite-lived intangible assets is as follows (in thousands):



2020	$	8,947
2021	7,554
2022	6,686
2023	4,557
2024	2,411
Thereafter	912
Total	$	31,067