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5. Patents (Details Narrative) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 4 years |
2021 | $ 4,450 |  |  |  |  |  |  |  | $ 4,450 |
2022 | 4,451 |  |  |  |  |  |  |  | 4,451 |
2023 | 4,376 |  |  |  |  |  |  |  | 4,376 |
2024 | 3,005 |  |  |  |  |  |  |  | 3,005 |
2025 | 630 |  |  |  |  |  |  |  | 630 |
Impairment of intangible assets | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | 0 | $ 0
Accelerated amortization of patents |  |  |  |  |  |  |  |  | $ 0 | $ 0

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