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Document And Entity Information
3 Months Ended
Mar. 31, 2014
May 09, 2014
Document and Entity Information [Abstract]    
Entity Registrant Name ENERGY FOCUS, INC/DE  
Document Type 10-Q  
Current Fiscal Year End Date --12-31  
Entity Common Stock, Shares Outstanding   78,154,330
Amendment Flag false  
Entity Central Index Key 0000924168  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Smaller Reporting Company  
Entity Well-known Seasoned Issuer No  
Document Period End Date Mar. 31, 2014  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q1