GOODWILL AND INTANGIBLE ASSETS:

The carrying amount of goodwill as of December 31, 2018, 2017 and 2016 was $91.8 million with no changes to goodwill in any of the respective fiscal years.

Intangible assets consist primarily of developed technology, acquired licenses, customer relationships, trade name, domain name, in-process R&D and patent rights, and are reported net of accumulated amortization.

The Company amortizes the cost of all intangible assets over the shorter of the estimated useful life or the term of the developed technology, customer relationships, technology licenses and in-place leases, which range from two to twelve years, with the exception of $4.7 million of in-process R&D and $1.3 million paid to acquire an internet domain name. In-process R&D is assessed for impairment until the development is completed and products are available for sale, at which time the Company will begin to amortize the in-process R&D. The Company expects the amortization of in-process R&D to begin sometime in the second half of fiscal 2019. The Company acquired the rights to the internet domain name www.power.com, which is now the Company’s primary domain name; the cost to acquire the domain name has been recorded as an intangible asset and will not be amortized as it has an indefinite useful life. Amortization of acquired intangible assets was approximately $5.3 million, $6.1 million and $6.7 million in the years ended December 31, 2018, 2017 and 2016, respectively. The Company does not believe there is any significant residual value associated with the following intangible assets:



	December 31, 2018							December 31, 2017
(in thousands)	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
Domain name	$	1,261	$	—		$	1,261	$	1,261	$	—		$	1,261
In-process research and development	4,690		—			4,690		4,690		—			4,690
Developed technology	33,270		(22,464		)	10,806		33,270		(19,211		)	14,059
Customer relationships	20,030		(16,520		)	3,510		20,030		(14,621		)	5,409
Technology licenses	1,000		(115		)	885		—		—			—
In-place leases	—		—			—		660		(660		)	—
Total intangible assets	$	60,251	$	(39,099	)	$	21,152	$	59,911	$	(34,492	)	$	25,419

The estimated future amortization expense related to definite-lived intangible assets at December 31, 2018, is as follows:



Fiscal Year	Estimated Amortization (in thousands)
2019	$	4,878
2020	3,653
2021	2,787
2022	1,709
2023	1,467
Thereafter	707
Total ⁽¹⁾	$	15,201

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(1)	The total above excludes $4.7 million of in-process R&D which will be amortized upon completion of development over the estimated useful life of the technology.