Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Components of Intangible assets

Intangible assets consist of the following:

	September 30, 2015
	Cost		Accumulated Amortization			Net		Weighted Average Remaining Life
Raw material supply agreement	$	6,152	$	(1,432	)	$	4,720	10.3 years
Renewable hydrocarbon diesel technology	8,300		(738		)	7,562		13.8 years
Ground lease	200		(108		)	92		6.3 years
Acquired customer relationships	2,900		—			2,900		10.0 years
Total amortizing intangibles	17,552		(2,278		)	15,274
In-process research and development, indefinite lives	15,956		—			15,956
Total intangible assets	$	33,508	$	(2,278	)	$	31,230

	December 31, 2014
	Cost		Accumulated Amortization			Net		Weighted Average Remaining Life
Raw material supply agreement	$	5,914	$	(1,113	)	$	4,801	11.0 years
Renewable hydrocarbon diesel technology	8,300		(323		)	7,977		14.5 years
Ground lease	200		(97		)	103		6.9 years
Total amortizing intangibles	14,414		(1,533		)	12,881
In-process research and development, indefinite lives	15,956		—			15,956
Total intangible assets	$	30,370	$	(1,533	)	$	28,837

Estimated amortization expense

The estimated intangible asset amortization expense for fiscal year 2015 through fiscal year 2021 and thereafter is as follows:

October 1, 2015 through December 31, 2015	$	329
2016	1,330
2017	1,344
2018	1,358
2019	1,373
2020	1,389
2021 and thereafter	8,151
Total	$	15,274