Intangible Assets - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Components of Intangible assets
Cost	$ 17,630	$ 14,414
Accumulated amortization	(2,645)	(1,533)
Net	14,985	12,881
Cost	33,586	30,370
Accumulated Amortization	(2,645)	(1,533)
Net	30,941	28,837
In-process research and development, indefinite lives
Components of Intangible assets
Cost	15,956	15,956
Accumulated Amortization	0	0
Net	15,956	15,956
Raw material supply agreement
Components of Intangible assets
Cost	6,230	5,914
Accumulated amortization	(1,551)	(1,113)
Net	$ 4,679	$ 4,801
Weighted Average Remaining Life	10 years	11 years
Renewable hydrocarbon diesel technology
Components of Intangible assets
Cost	$ 8,300	$ 8,300
Accumulated amortization	(876)	(323)
Net	$ 7,424	$ 7,977
Weighted Average Remaining Life	13 years 6 months	14 years 6 months
Acquired customer relationships
Components of Intangible assets
Cost	$ 2,900
Accumulated amortization	(106)
Net	$ 2,794
Weighted Average Remaining Life	9 years 7 months 15 days
Ground lease
Components of Intangible assets
Cost	$ 200	$ 200
Accumulated amortization	(112)	(97)
Net	$ 88	$ 103
Weighted Average Remaining Life	5 years 10 months 24 days	6 years 10 months 24 days