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Intangible Assets, Net | 3 Months Ended
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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 |  |  |  |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -URI https://asc.fasb.org/subtopic&trid=2144471 + Details
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