Goodwill represents the excess of purchase consideration in a business combination over the fair value of tangible and intangible assets acquired net of the liabilities assumed. During the year ended December 31, 2019, the Company recorded goodwill of $72.7 from the dataxu acquisition. Goodwill recorded from the dataxu acquisition relates to the Company’s platform segment. The goodwill is evaluated for impairment annually. No impairment was recognized during the years ended December 31, 2019, 2018 and 2017.

The following table is the summary of Company’s intangible assets (in thousands):

	As of December 31, 2019
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted-Average Useful Lives (in years)
Developed technology	$	62,367	$	(2,860	)	$	59,507		5.9
Customer relationships		13,400		(558	)		12,842		4.0
Tradename		400		(133	)		267		0.5
Patents		4,076		(24	)		4,052		14.0
Intangible assets	$	80,243	$	(3,575	)	$	76,668

	As of December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted-Average Useful Lives (in years)
Developed technology	$	2,215	$	(738	)	$	1,477		4.0
Intangible assets	$	2,215	$	(738	)	$	1,477

During the year ended December 31, 2019, the Company acquired $70.2 million of developed technology, customer relationships, and tradename as a part of the dataxu acquisition. Additionally, during the year ended December 31, 2019, the Company acquired $4.1 million of patents and $3.8 million of developed technology in form of asset acquisitions.

The Company recorded expenses of $2.8 million, $0.6 million and $0.2 million for amortization of intangible assets during the years ended December 31, 2019, 2018 and 2017, respectively. In the year ended December 31, 2019, the Company recorded amortization of developed technology in cost of revenue, platform, cost of revenue, player, research and development, and general and administrative expenses in the consolidated statement of operations and recorded amortization of customer relationships and tradename in sales and marketing expenses in the consolidated statement of operations. In the years ended December 31, 2018 and 2017, the Company recorded amortization of developed technology on research and development expenses in the consolidated statement of operations.

The estimated future amortization expense for intangible asset for the next five years and thereafter is as follows (in thousands):

Year Ending December 31,
2020	$	14,487
2021		14,036
2022		13,666
2023		13,108
2024		10,316
Thereafter		11,055
Total	$	76,668