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7. Intangible Assets (Tables)
6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets
   

June 30,

2019

   

December 31,

2018

 
Customer relationships   $ 941     $ 941  
Less: accumulated amortization     (801 )     (774 )
Total   $ 140     $ 167