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INTANGIBLE ASSETS - Note 8 | 12 Months Ended
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Dec. 31, 2019
Notes To Financial Statements Abstract |
Intangible assets - Note 8 | 8. INTANGIBLE ASSETS Our intangible assets consist exclusively of technology-based purchased patents. The gross book value of our intangible assets was $951,000 and $1.6 million in the years ended December 31, 2019 and 2018, respectively. Amortization expense was $105,000 in 2019 and $116,000 in 2018. 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. In 2018, there were no impairments recorded and none of our patents were abandoned in prosecution. The following table outlines our estimated future amortization expense related to intangible assets held at December 31, 2019 (in thousands):
Years Ended December 31, |  |  | Amount
2020 |  | $ | 57
2021 |  |  | 49
2022 |  |  | 40
2023 |  |  | 32
2024 |  |  | 22
Thereafter |  |  | 21
|  | $ | 221

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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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