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4. PATENTS, NET OF ACCUMULATED AMORTIZATION (Details Narrative) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Accumulated amortization | $ 321,784 | $ 319,922
Accrued patent acquisition costs | 15,000 |
Accrued patent acquisition costs due within a year | 10,000 |
Accrued patent acquisition costs due within 1 year |  |
Accrued patent acquisition costs due within 2 years | $ 5,000 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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