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4. PATENTS (Tables)
9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of intangible assets
     
For the years ending December 31,    
(In thousands)     
Remainder of 2020  $1,158 
2021   4,451 
2022   4,451 
2023   4,376 
2024   3,005 
Thereafter   630 
  Patents, net  $18,071