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8. Intangible Assets (Tables)
6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets
   

June 30,

2020

   

December 31,

2019

 
Customer relationships   $ 1,171     $ 1,292  
Less: accumulated amortization     (873 )     (827 )
Total   $ 298     $ 465