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Nature of Operations	6 Months Ended
Nature of Operations	Jun. 30, 2015
Disclosure Text Block [Abstract]
Nature of Operations	NATURE OF OPERATIONS Energy Focus, Inc. and its subsidiaries engage in the design, development, manufacturing, marketing, and installation of energy-efficient lighting systems. Prior to 2015, we provided turnkey, high-quality, energy-efficient lighting application alternatives, primarily to the existing public-sector building market, and reported this business as a separate “solutions” segment. However, in the third quarter of 2014, we began shifting our focus away from the turnkey solutions business to align our resources with developing and selling our energy-efficient LED products into the commercial and government markets. During the first quarter of 2015, we completed all outstanding solutions-based projects and are no longer accepting new solutions-based projects. As such, our management has determined that the Company operates in a single industry segment. Additionally, product development remains a key focus for us. Our product development team is dedicated to developing and designing leading-edge technology LED lighting products, and we have curtailed our efforts on bidding on research contracts and grants.