Intangible Assets, Net

3 Months Ended

Mar. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets, Net

Intangible Assets, Net

Intangible assets consist of the following:

	March 31, 2023						December 31, 2022
(in thousands)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortizable intangible assets:
Patents	$	4,061	$	(665)	$	3,396	$	3,792	$	(621)	$	3,170
License agreements	1,101		(1,041)		60		1,101		(1,014)		87
Total amortizable intangible assets	5,162		(1,706)		3,456		4,893		(1,635)		3,258
Unamortized intangible assets:
Trademarks	402		—		402		391		—		391
Total intangible assets	$	5,564	$	(1,706)	$	3,858	$	5,284	$	(1,635)	$	3,649

Amortization expense is as follows:

	Three Months Ended March 31,
(in thousands)	2023		2022
Amortization expense	$	71	$	69

As of March 31, 2023, future amortization of patents and license agreements is as follows:

Year Ending December 31,	(in thousands)
2023 (excluding the three months ended March 31, 2023)	$	189
2024	195
2025	195
2026	194
2027	190
Thereafter	2,493
Total	$	3,456

License Agreements

The Company has various license agreements that require the payment of royalty fees.

Royalty fee expense included in sales and marketing expense is as follows:

	Three Months Ended March 31,
(in thousands)	2023		2022
Royalty fee expense	$	831	$	673