Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
REVENUES:
Biomass-based diesel sales	$ 1,787,308,000	$ 1,417,595,000	$ 954,742,000
Separated RIN sales	337,501,000	274,800,000	186,539,000
Biomass-based diesel government incentives	28,728,000	346,672,000	245,868,000
Total biomass-based diesel revenues	2,153,537,000	2,039,067,000	1,387,149,000
Other revenues	4,706,000	2,165,000	195,000
Total revenues	2,158,243,000	2,041,232,000	1,387,344,000
COSTS OF GOODS SOLD:
Biomass-based diesel	1,805,410,000	1,616,991,000	1,093,979,000
Separated RINs	264,765,000	250,809,000	182,688,000
Other costs of goods sold	4,487,000	1,916,000	134,000
Total cost of goods sold	2,074,662,000	1,869,716,000	1,276,801,000
GROSS PROFIT	83,581,000	171,516,000	110,543,000
SELLING, GENERAL, AND ADMINISTRATIVE EXPENSES	93,425,000	88,285,000	73,397,000
RESEARCH AND DEVELOPMENT EXPENSE	14,091,000	18,163,000	16,851,000
IMPAIRMENT OF PROPERTY, PLANT, AND EQUIPMENT	49,873,000	17,893,000	0
IMPAIRMENT OF GOODWILL	0	0	175,028,000
INCOME (LOSS) FROM OPERATIONS	(73,808,000)	47,175,000	(154,733,000)
OTHER INCOME (EXPENSE), NET:
Change in fair value of contingent consideration	(2,484,000)	(7,904,000)	359,000
Change in fair value of convertible debt conversion liability	(18,833,000)	13,045,000	0
Gain on debt extinguishment	0	2,331,000	0
Gain on involuntary conversion	5,329,000	9,894,000	0
Other income (expense)	(1,018,000)	427,000	5,830,000
Interest expense	(18,755,000)	(15,987,000)	(11,867,000)
Total other income (expense), net	(35,761,000)	1,806,000	(5,678,000)
INCOME (LOSS) BEFORE INCOME TAXES	(109,569,000)	48,981,000	(160,411,000)
INCOME TAX BENEFIT (EXPENSE)	30,490,000	(4,268,000)	8,701,000
NET INCOME (LOSS)	(79,079,000)	44,713,000	(151,710,000)
LESS—NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST	0	386,000	(318,000)
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY	(79,079,000)	44,327,000	(151,392,000)
LESS—EFFECT OF PARTICIPATING SHARE-BASED AWARDS	0	(874,000)	0
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY’S COMMON STOCKHOLDERS	$ (79,079,000)	$ 43,453,000	$ (151,392,000)
Net income (loss) per share attributable to common stockholders:
Basic (in dollars per share)	$ (2.04)	$ 1.06	$ (3.44)
Diluted (in dollars per share)	$ (2.04)	$ 1.06	$ (3.44)
Weighted-average shares used to compute net income (loss) per share attributable to common stockholders:
Basic (in shares)	38,731,015	40,897,549	43,958,803
Diluted (in shares)	38,731,015	40,902,860	43,958,803