Intangible Assets

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

INTANGIBLE ASSETS

Intangible assets consist of the following:

	As of December 31, 2020
	Carrying Value		Accumulated  Amortization		Net Intangible
Amortizable intangible assets:
Product technology	$	14,625	$	10,785	$	3,840
Patents and trademarks	14,325		7,495		6,830
Customer relationships	6,541		4,002		2,539
Other	5,265		5,173		92
Total	$	40,756	$	27,455	$	13,301

	As of December 31, 2019
	Carrying Value		Accumulated  Amortization		Net Intangible
Amortizable intangible assets:
Product technology	$	24,135	$	19,798	$	4,337
Patents and trademarks	13,726		6,894		6,832
Customer relationships	5,150		2,509		2,641
Other	8,875		8,214		661
Total	$	51,886	$	37,415	$	14,471

For the year ended, December 31, 2019, as a result of historical and projected financial performance lower than our expectations and changes in our go-forward strategy in connection with our new strategic plan, the estimated fair value of acquired intangibles recognized with the Nutfield, Laser Control Systems, Lanmark and Open Technologies acquisitions were determined to be less than the carrying value of the net carrying value for such assets. We recognized an impairment charge related to such acquired intangibles of $10.5 million in the fourth quarter of 2019. This impairment charge was primarily related to customer relationship and technology intangible assets.

Amortization expense was $3.4 million, $5.6 million and $5.4 million in 2020, 2019 and 2018, respectively. The estimated amortization expense for each of the years 2021 through 2025 and thereafter is as follows:

Years ending December 31,	Amount
2021	$	3,760
2022	2,536
2023	1,903
2024	1,569
2025	1,394
Thereafter	2,139
	$	13,301