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Nature of Operations	6 Months Ended
Nature of Operations	Jun. 30, 2018
Disclosure Text Block [Abstract]
Nature of Operations	NATURE OF OPERATIONS Energy Focus, Inc. and its subsidiary engage in the design, development, manufacturing, marketing, and sale of energy-efficient lighting systems. We operate in a single industry segment, developing and selling our energy-efficient light-emitting diode (“LED”) lighting products into the general commercial, industrial and military maritime markets. Our mission is to enable our customers to run their facilities with greater energy efficiency, productivity, and wellness through advanced LED retrofit solutions. Our goal is to be the retrofit technology and market leader for the most demanding applications where performance, quality, and health really matter. We specialize in LED lighting retrofit by replacing fluorescent lamps in institutional buildings and high-intensity discharge (“HID”) lighting in low-bay and high-bay applications with our innovative, high-quality commercial and military tubular LED (“TLED”) and other LED products. Product development is a key focus for us. Our product development teams, including our teams located in our Solon, Ohio headquarters, at our San Jose, California technology center, and at our product development center in Taipei, Taiwan, are dedicated to developing and designing leading-edge technology LED lighting products.