Intangible Assets, Net (Tables)

6 Months Ended

Jun. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of intangible assets

Intangible assets consist of the following:

	June 30, 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	$	4,322	$	(711)	$	3,611	$	3,792	$	(621)	$	3,170
License agreements	1,101		(1,068)		34		1,101		(1,014)		87
Total amortizable intangible assets	5,423		(1,779)		3,645		4,893		(1,635)		3,258
Unamortized intangible assets:
Trademarks	403		—		403		391		—		391
Total intangible assets	$	5,827	$	(1,779)	$	4,048	$	5,284	$	(1,635)	$	3,649

Schedule of indefinite-lived intangible assets

Intangible assets consist of the following:

	June 30, 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	$	4,322	$	(711)	$	3,611	$	3,792	$	(621)	$	3,170
License agreements	1,101		(1,068)		34		1,101		(1,014)		87
Total amortizable intangible assets	5,423		(1,779)		3,645		4,893		(1,635)		3,258
Unamortized intangible assets:
Trademarks	403		—		403		391		—		391
Total intangible assets	$	5,827	$	(1,779)	$	4,048	$	5,284	$	(1,635)	$	3,649

Schedule of amortization expense

Amortization expense is as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	2023		2022		2023		2022
Amortization expense	$	73	$	63	$	144	$	132

Schedule of future amortization

As of June 30, 2023, future amortization of patents and license agreements is as follows:

Year Ending December 31,	(in thousands)
2023 (excluding the six months ended June 30, 2023)	$	121
2024	208
2025	208
2026	207
2027	203
Thereafter	2,698
Total	$	3,645

Schedule of royalty expenses

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

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	2023		2022		2023		2022
Royalty fee expense	$	868	$	766	$	1,698	$	1,439