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Intangible Assets, Net | 6 Months Ended
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Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, Net | Intangible Assets, Net The Company’s intangible assets consisted of the following (in thousands):
| June 30, 2022 |  | December 31, 2021
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |
Patents | $ | 3,083 |  |  | $ | (304) |  |  | $ | 2,780 |  |  | $ | 2,469 |  |  | $ | (234) |  |  | $ | 2,235 |
License agreements | 1,101 |  |  | (916) |  |  | 185 |  |  | 1,101 |  |  | (852) |  |  | 249 |
Total amortizable intangible assets | 4,184 |  |  | (1,219) |  |  | 2,965 |  |  | 3,570 |  |  | (1,086) |  |  | 2,484 |
Unamortized intangible assets |  |  |  |  |  |  |  |  |  |  |
Trademarks | 380 |  |  | — |  |  | 380 |  |  | 375 |  |  | — |  |  | 375 |
Total intangible assets | $ | 4,565 |  |  | $ | (1,219) |  |  | $ | 3,346 |  |  | $ | 3,945 |  |  | $ | (1,086) |  |  | $ | 2,859 |
Amortization expense consisted of the following (in thousands):
| Three Months Ended June, 30 |  | Six Months Ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Amortization expense | $ | 63 |  |  | $ | 49 |  |  | $ | 132 |  |  | $ | 96 |
Expected future amortization of intangible assets as of June 30, 2022, is as follows (in thousands):
Year Ending December 31, | Expected Amortization Expense
2022 (excluding the six months ended June 30, 2022) | $ | 131 |
2023 | 229 |
2024 | 160 |
2025 | 159 |
2026 | 158 |
Thereafter | 2,128 |
Total amortized intangible assets | $ | 2,965 |
License Agreements The Company has License Agreements with the University of Florida Research Foundation and the University of Texas at Austin in which certain royalty payments are paid quarterly. Royalty expense consisted of the following (in thousands):
| Three Months Ended June, 30 |  | Six Months Ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Royalty expense | $ | 766 |  |  | $ | 709 |  |  | $ | 1,439 |  |  | $ | 1,350 |
Royalty fees are included in sales and marketing expense on the condensed consolidated statements of operations.

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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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