Intangible Assets

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

Intangible assets are summarized as follows (in thousands):

	June 30, 2021						December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortized intangible assets
Patents and know how	$	9,546	$	(6,069)	$	3,477	$	9,510	$	(5,730)	$	3,780
Licenses	1,414		(1,403)		11		1,414		(1,334)		80
Customer and supplier relationships	241		(181)		60		241		(172)		69
Non-compete agreements	120		(113)		7		120		(98)		22
Total amortized intangible assets	$	11,321	$	(7,766)	$	3,555	$	11,285	$	(7,334)	$	3,951
Unamortized intangible assets
Trade names and trademarks	$	1,008			$	1,008	$	1,008			$	1,008
Patents in process	1,187				1,187		1,045				1,045
Total intangible assets	$	13,516			$	5,750	$	13,338			$	6,004

Amortization expense for the three and six months ended June 30, 2021 and 2020 is summarized in the table below (amounts in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Amortization expense	$	215	$	271	$	454	$	542

Expected future amortization of intangible assets as of June 30, 2021, is as follows (in thousands):

Year ending December 31,	Estimated Amortization Expense
2021 (excluding the six months ended June 30, 2021)	$	366
2022	694
2023	694
2024	694
2025	282
Thereafter	825
Total amortized intangible assets	$	3,555