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Cover
Nov. 12, 2024
Nov. 09, 2023
Cover [Abstract]    
Document Type   8-K
Document Period End Date Nov. 12, 2024  
Entity Registrant Name   ENERGY FOCUS, INC/DE
Entity Incorporation, State or Country Code   DE
Entity File Number   001-36583
Entity Tax Identification Number   94-3021850
Entity Address, Address Line One   32000 Aurora Road 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
Written Communications   false
Soliciting Material   false
Pre-commencement Tender Offer   false
Pre-commencement Issuer Tender Offer   false
Title of 12(b) Security   Common Stock, par value $0.0001 per share
Trading Symbol   EFOI
Security Exchange Name   NASDAQ
Entity Emerging Growth Company   false
Entity Central Index Key   0000924168
Amendment Flag   false