Quarterly report pursuant to Section 13 or 15(d)

4. Inventories - Schedule of Inventories (Details)

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4. Inventories - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
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