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8. Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets
    March 31,     December 31,  
    2018     2017  
Customer relationships   $ 941     $ 941  
Developed technology     198       198  
Less: accumulated amortization                
  Customer relationships     ( 720 )     ( 702 )
  Developed technology     ( 198 )     (198 )
Total   $ 221     $ 239