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Intangible assets | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible assets | Intangible assets Intangible assets consist of the following as of December 31, 2024 and 2023.
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
December 31, 2024 |  |  |  |  |
Definite-lived: Data access agreement | $ | 250 |  |  | $ | 107 |  |  | $ | 143 |
Indefinite-lived: Data purchases | 328 |  |  | - |  |  | 328 |
| $ | 578 |  |  | $ | 107 |  |  | $ | 471 |
December 31, 2023 |  |  |  |  |
Definite-lived: Data access agreement | $ | 272 |  |  | $ | 97 |  |  | $ | 175 |
Indefinite-lived: Data purchases | 339 |  |  | - |  |  | 339 |
| $ | 611 |  |  | $ | 97 |  |  | $ | 514 |
Aggregate intangible asset amortization expense was $19 for the years ended December 31, 2024, 2023 and 2022 and was recorded in depreciation, amortization and accretion expense in the consolidated statements of operations. Estimated future intangible asset amortization expense based upon the carrying value as of December 31, 2024 is as follows (in thousands):
| 2025 |  | 2026 |  | 2027 |  | 2028 |  | 2029 |  | Thereafter
Amortization expense | $ | 19 |  |  | $ | 19 |  |  | $ | 19 |  |  | $ | 19 |  |  | $ | 19 |  |  | $ | 48 |

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