Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	$ 17,552	$ 14,414
Accumulated Amortization, finite-lived	(2,278)	(1,533)
Total	15,274	12,881
Cost, indefinite lived	33,508	30,370
Accumulated Amortization, indefinite-lived	(2,278)	(1,533)
Net, indefinite-lived	31,230	28,837
In-process research and development, indefinite lives
Finite-Lived Intangible Assets [Line Items]
Cost, indefinite lived	15,956	15,956
Accumulated Amortization, indefinite-lived	0	0
Net, indefinite-lived	15,956	15,956
Raw material supply agreement
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	6,152	5,914
Accumulated Amortization, finite-lived	(1,432)	(1,113)
Total	$ 4,720	$ 4,801
Weighted Average Remaining Life	10 years 3 months	11 years
Renewable hydrocarbon diesel technology
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	$ 8,300	$ 8,300
Accumulated Amortization, finite-lived	(738)	(323)
Total	$ 7,562	$ 7,977
Weighted Average Remaining Life	13 years 9 months	14 years 6 months
Ground lease
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	$ 200	$ 200
Accumulated Amortization, finite-lived	(108)	(97)
Total	$ 92	$ 103
Weighted Average Remaining Life	6 years 3 months 24 days	6 years 10 months 24 days
Acquired customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost, finite-lived	$ 2,900
Accumulated Amortization, finite-lived	0
Total	$ 2,900
Weighted Average Remaining Life	10 years