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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Mar. 14, 2023
Jun. 30, 2022
Cover [Abstract]        
Document Type 10-K      
Amendment Flag false      
Document Annual Report true      
Document Transition Report false      
Document Period End Date Dec. 31, 2022      
Document Fiscal Period Focus FY      
Document Fiscal Year Focus 2022      
Current Fiscal Year End Date --12-31      
Entity File Number 001-33886      
Entity Registrant Name ACORN ENERGY, INC.      
Entity Central Index Key 0000880984      
Entity Tax Identification Number 22-2786081      
Entity Incorporation, State or Country Code DE      
Entity Address, Address Line One 1000 N West Street      
Entity Address, Address Line Two Suite 1200      
Entity Address, City or Town Wilmington      
Entity Address, State or Province DE      
Entity Address, Postal Zip Code 19801      
City Area Code 410      
Local Phone Number 654-3315      
Entity Well-known Seasoned Issuer No      
Entity Voluntary Filers No      
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 Public Float       $ 14.5
Entity Common Stock, Shares Outstanding     39,757,589  
Documents incorporated by reference None      
ICFR Auditor Attestation Flag false      
Auditor Firm ID 688 711    
Auditor Name Marcum LLP Friedman LLP    
Auditor Location Marlton New Jersey Marlton, New Jersey