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2. PROPERTY AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property and equipment
   December 31, 
   2018   2017 
Technical and laboratory equipment  $210,669   $220,511 
Leasehold improvements   4,255    4,454 
Office equipment   12,307    12,883 
    227,231    237,848 
Less accumulated depreciation   (222,302)   (230,795)
Total  $4,929   $7,053