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4. Patents (Tables)
6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of annual amortization expense
For the years ending December 31,     
 (In thousands)      
 Remainder of 2019   $1,720 
 2020    2,555 
 2021    1,695 
 2022    1,695 
 2023    1,620 
 Thereafter    249 
     $9,534