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4. Patents (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Future amortization remainder 2019 $ 1,720  
2020 2,555  
2021 1,695  
2022 1,695  
2023 1,620  
Thereafter 249  
Total future amortization $ 9,534 $ 6,587