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Nature of Operations	6 Months Ended
Nature of Operations	Jun. 30, 2017
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. Recently, we have aligned our resources and focused our efforts on the sale of our LED lighting products, in particular our commercial and military tubular LED (“TLED”) lines of products, into targeted vertical markets. Our goal is to become a trusted leader in the LED lighting retrofit market 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 TLED products. Product development is a key focus for us. Our product development team, including our team located at our product development center in Taipei, Taiwan, is dedicated to developing and designing leading-edge technology LED lighting products.