| Intangible Assets, Net Intangible assets, net consist of the following as of the periods presented: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | June 30, 2025 | | December 31, 2024 | | (in thousands) | Gross Carrying Amount | | Accumulated Amortization | | Net Carrying Amount | | Gross Carrying Amount | | Accumulated Amortization | | Net Carrying Amount | | Amortizable intangible assets: | | | | | | | | | | | | | Patents | $ | 6,728 | | | $ | (1,239) | | | $ | 5,489 | | | $ | 6,090 | | | $ | (1,073) | | | $ | 5,017 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Unamortized intangible assets: | | | | | | | | | | | | | Trademarks | 626 | | | — | | | 626 | | | 562 | | | — | | | 562 | | | Total intangible assets | $ | 7,354 | | | $ | (1,239) | | | $ | 6,115 | | | $ | 6,652 | | | $ | (1,073) | | | $ | 5,579 | |
Amortization expense is as follows for the periods presented: | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, | | Six Months Ended June 30, | | (in thousands) | 2025 | | 2024 | | 2025 | | 2024 | | Amortization expense | $ | 66 | | | $ | 76 | | | $ | 133 | | | $ | 138 | |
As of June 30, 2025, future amortization of patents is as follows: | | | | | | | Year Ending December 31, | (in thousands) | | 2025 (excluding the six months ended June 30, 2025) | $ | 167 | | | 2026 | 334 | | | 2027 | 334 | | | 2028 | 334 | | | 2029 | 334 | | | Thereafter | 3,986 | | | Total | $ | 5,489 | |
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