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4. PATENTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2020 $ 2,332  
2021 4,451  
2022 4,451  
2023 4,376  
2024 3,005  
Thereafter 630  
 Patents, net $ 19,245 $ 7,814