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8. INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2022
Goodwill And Intangible Assets Disclosure Abstract |
8. INTANGIBLE ASSETS | 8. INTANGIBLE ASSETS Our intangible assets consist exclusively of technology-based purchased patents. The gross book value of our intangible assets was $951,000 in the years ended December 31, 2022 and 2021, respectively. Amortization expense was $40,000 in 2022, $49,000 in 2021 and $57,000 in 2020. The following table outlines our estimated future amortization expense related to intangible assets held at December 31, 2022 (in thousands):
Years Ended December 31, |  | Amount |
2023 |  |  | 32 |
2024 |  |  | 22 |
2025 |  |  | 14 |
2026 |  |  | 7 |
|  |  | 75 |

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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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