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16. Amount Due to an Affiliate (Tables)
12 Months Ended
Dec. 31, 2020
Increase Decrease In Third Party Net  
Amount Due to an Affiliate
   December 31,   December 31, 
   2020   2019 
Amount due to an affiliate, current  $9,756   $9,128 
Amount due to an affiliate, noncurrent   832    1,728 
Total amount due to an affiliate  $10,588   $10,856