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Intangible Assets, Net | 9 Months Ended
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Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, Net | Intangible Assets, Net Intangible assets consist of the following:
| September 30, 2024 |  | December 31, 2023
(in thousands) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |
Patents | $ | 5,691 |  |  | $ | (1,009) |  |  | $ | 4,682 |  |  | $ | 4,905 |  |  | $ | (820) |  |  | $ | 4,085 |
License agreements | — |  |  | — |  |  | — |  |  | 1,101 |  |  | (1,087) |  |  | 14 |
Total amortizable intangible assets | 5,691 |  |  | (1,009) |  |  | 4,682 |  |  | 6,006 |  |  | (1,907) |  |  | 4,099 |
Unamortized intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trademarks | 533 |  |  | — |  |  | 533 |  |  | 432 |  |  | — |  |  | 432 |
Total intangible assets | $ | 6,224 |  |  | $ | (1,009) |  |  | $ | 5,215 |  |  | $ | 6,438 |  |  | $ | (1,907) |  |  | $ | 4,531 |
Amortization expense is as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2024 |  | 2023 |  | 2024 |  | 2023
Amortization expense | $ | 65 |  |  | $ | 70 |  |  | $ | 202 |  |  | $ | 214 |
As of September 30, 2024, future amortization of patents and license agreements is as follows:
Year Ending December 31, | (in thousands)
2024 (excluding the nine months ended September 30, 2024) | $ | 68 |
2025 | 272 |
2026 | 272 |
2027 | 272 |
2028 | 272 |
Thereafter | 3,526 |
Total | $ | 4,682 |
License Agreements The Company had various license agreements that required the payment of royalty fees. Royalty fee expense included in sales and marketing expense is as follows:
| Three Months Ended September 30, | Nine Months Ended September 30,
(in thousands) | 2024 |  | 2023 | 2024 |  | 2023
Royalty fee expense (1) | $ | — |  |  | $ | 930 |  | $ | — |  |  | $ | 2,628 |
(1) Royalty fees are no longer being paid due to the expiration of the patents in 2023.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/985-20/tableOfContent + Details
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