Intangible Assets

3 Months Ended

Mar. 31, 2021

Intangible Assets Net Excluding Goodwill [Abstract]

11. INTANGIBLE ASSETS

Intangible assets consisted of the following:

	As of March 31, 2021							As of December 31, 2020
(In thousands)	Gross Carrying Amount		Accumulated Amortization			Net Book Value		Gross Carrying Amount		Accumulated Amortization			Net Book Value
Customer relationships	$	20,934	$	(8,451	)	$	12,483	$	21,123	$	(8,055	)	$	13,068
Developed technology		8,200		(2,830	)		5,370		8,200		(2,546	)		5,654
Licensed technology		5,900		(1,994	)		3,906		5,900		(1,830	)		4,070
Supplier relationships		—		—			—		2,800		(2,800	)		—
Licensing agreements		560		(170	)		390		560		(152	)		408
Patents		500		(312	)		188		500		(294	)		206
Trade names		210		(163	)		47		210		(146	)		64
Total	$	36,304	$	(13,920	)	$	22,384	$	39,293	$	(15,823	)	$	23,470

The Company evaluates the carrying value of intangible assets whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable and the undiscounted cash flows estimated to be generated by the asset are less than the asset’s carrying value. Due to the current economic environment, particularly related to COVID-19, the Company assessed impairment triggers related to intangible assets during the first quarter of 2021 and 2020. Based on this assessment, no triggers occurred to require the performance of an impairment test, and no impairment losses of intangible assets were recorded for the three months ended March 31, 2021 or 2020.

Amortization expense was $1.0 million and $1.3 million for the three months ended March 31, 2021 and 2020, respectively, and was included in cost of revenue, selling, general and administrative expenses and research and development expenses in the Condensed Consolidated Statements of Income (Loss).

Estimated future amortization expense of intangible assets was as follows:

(In thousands)	As of March 31, 2021
2021	$	3,067
2022		3,482
2023		3,330
2024		3,236
2025		3,028
Thereafter		6,241
Total	$	22,384