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10. INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
10. INTANGIBLE ASSETS | 10. 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, 2021 and 2020, respectively. Amortization expense was $49,000 in 2021, $57,000 in 2020 and $105,000 in 2019. In 2019, we recorded an impairment amounting to $160,000 on 52 patents that we elected not to renew, and one patent abandoned in prosecution. The following table outlines our estimated future amortization expense related to intangible assets held at December 31, 2021 (in thousands): Estimated Future Amortization Expense Related to Intangible Assets
Years Ended December 31, |  |  | Amount
2022 |  | $ | 40
2023 |  |  | 32
2024 |  |  | 22
2025 |  |  | 14
2026 |  |  | 7
Thereafter |  |  | -
Total |  | $ | 115

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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