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2. PROPERTY AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property and equipment
   December 31, 
   2019   2018 
Technical and laboratory equipment  $206,448   $210,669 
Leasehold improvements   4,170    4,255 
Office equipment   11,222    12,307 
    221,840    227,231 
Less accumulated depreciation   (218,357)   (222,302)
Total  $3,483   $4,929