| Intangible Assets The following table summarizes the carrying amount of intangible assets, net of accumulated amortization. | | | | | | | | | | | | | | | | | | | | | | | March 31, 2024 | | (in thousands) | | Gross Carrying
Value | | Accumulated
Amortization | | Net Carrying
Amount | | Patents | | $ | 1,860 | | | $ | (1,307) | | | $ | 553 | | | Acquired intellectual property and reacquired rights | | 15,126 | | | (10,937) | | | 4,189 | | | Internal-use software implementation costs | | 2,873 | | | (2,855) | | | 18 | | | | $ | 19,859 | | | $ | (15,099) | | | $ | 4,760 | |
| | | | | | | | | | | | | | | | | | | | | | | December 31, 2023 | | (in thousands) | | Gross Carrying
Value | | Accumulated
Amortization | | Net Carrying
Amount | | Patents | | $ | 1,847 | | | $ | (1,297) | | | $ | 550 | | | Acquired intellectual property and reacquired rights | | 15,126 | | | (10,737) | | | 4,389 | | | Internal-use software implementation costs | | 2,873 | | | (2,835) | | | 38 | | | | $ | 19,846 | | | $ | (14,869) | | | $ | 4,977 | |
Amortization expense for the three months ended March 31, 2024 and 2023 was approximately $0.2 million and $0.5 million, respectively.
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