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Patents and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2021

Patents and Other Intangible Assets

Schedule of Patents and other intangible assets

Patents and other intangible assets are summarized as follows:

​

​	​	​	​	​	​	​
​	​	December 31,
(in thousands)		2021			2020
​	​	​	​	​	​
Patents	​	​	​	​	​	​
Patents pending	​	$	439	​	$	731
Issued patents	​		577	​		883
​	​		1,016	​		1,614
Trademarks	​		​	​		​
Trademarks pending	​		3	​		105
Registered trademarks	​		94	​		23
​	​		97	​		128
Other	​		8	​		8
​	​		1,121	​		1,750
Accumulated amortization	​		(322)	​		(448)
​	​	$	799	​	$	1,302

Schedule of future amortization expense

Future amortization expense associated with awarded patents and registered trademarks as of December 31, 2021 is as follows:

​

​	​	​	​
(in thousands)	​	​	​
2022		$	117
2023	​		96
2024	​		74
2025	​		42
2026	​		9
Thereafter	​		11
​	​	$	349

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