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Inventories. (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories
   September 30,
2020
   December 31,
2019
 
Finished goods  $23,179   $38,194 
Work in progress   2,503    7,426 
Raw materials   6,873    7,890 
Low-carbon and RIN credits   3,751    5,690 
Other   1,400    1,400 
Total  $37,706   $60,600