Quarterly report pursuant to Section 13 or 15(d)

4. Inventories (Tables)

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4. Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventories
    September 30, 2017     December 31, 2016  
Finished goods   $ 46,314     $ 33,773  
Work in progress     9,637       7,092  
Raw materials     8,401       6,571  
LCFS credits     5,892       10,926  
Other     1,575       1,708  
Total   $ 71,819     $ 60,070