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5. Patents (Details Narrative) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated amortization | $ 322,774 |  |  |  | $ 319,580 |  |  |  | $ 322,774 | $ 319,580
Estimated useful lives |  |  |  |  |  |  |  |  | 4 years |
2020 | 2,555 |  |  |  |  |  |  |  | $ 2,555 |
2021 | 1,695 |  |  |  |  |  |  |  | 1,695 |
2022 | 1,695 |  |  |  |  |  |  |  | 1,695 |
2023 | 1,620 |  |  |  |  |  |  |  | 1,620 |
2024 | 249 |  |  |  |  |  |  |  | 249 |
Impairment of intangible assets | 0 | $ 0 | $ 0 | $ 0 | 0 | $ 0 | $ 28,210 | $ 0 | 0 | 28,210
Accelerated amortization of patents | $ 857 | $ 863 | $ 818 | $ 656 | $ 11,560 | $ 4,952 | $ 5,278 | $ 5,330 | $ 3,194 | 27,120
Patents [Member] |  |  |  |  |  |  |  |  |  |
Accelerated amortization of patents |  |  |  |  |  |  |  |  |  | $ 8,307

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