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4. PATENTS (Tables)
6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of intangible assets
      
For the years ending December 31,     
(In thousands)      
Remainder of 2020   $2,332 
2021    4,451 
2022    4,451 
2023    4,376 
2024    3,005 
Thereafter    630 
 Patents, net   $19,245