Basis of Presentation and Nature of the Business (Details) gal in Millions	3 Months Ended
	Mar. 31, 2020 facility gal	Aug. 31, 2019 gal
Class of Stock [Line Items]
Number of biorefineries	13
Number of operating biomass-based diesel production facilities	12
Production capacity per year | gal	505
Number of fermentation facilities	1
Number of multi-feedstock capable plants	10
REG New Boston
Class of Stock [Line Items]
Production capacity per year | gal		15
North America
Class of Stock [Line Items]
Number of biorefineries	11
Europe
Class of Stock [Line Items]
Number of biorefineries	2