v3.26.1

Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2026	May 12, 2026
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Document Transition Report	false
Entity File Number	001-36583
Entity Registrant Name	ENERGY FOCUS, INC/DE
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	94-3021850
Entity Address, Address Line One	32000 Aurora Road
Entity Address, Address Line Two	Suite B
Entity Address, City or Town	Solon
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	44139
City Area Code	(440)
Local Phone Number	715-1300
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	EFOI
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		6,303,433
Entity Central Index Key	0000924168
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
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Local phone number for entity.

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ENERGY FOCUS, INC/DE 10-Q