v3.25.1
Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Jun. 02, 2025
Jun. 30, 2024
Document Type 10-K      
Amendment Flag false      
Document Annual Report true      
Document Transition Report false      
Document Period End Date Dec. 31, 2024      
Document Fiscal Period Focus FY      
Document Fiscal Year Focus 2024      
Current Fiscal Year End Date --12-31      
Entity File Number 001-38742      
Entity Registrant Name Advent Technologies Holdings, Inc.      
Entity Central Index Key 0001744494      
Entity Tax Identification Number 83-0982969      
Entity Incorporation, State or Country Code DE      
Entity Address, Address Line One 5637 La Ribera St.      
Entity Address, Address Line Two Suite A      
Entity Address, City or Town Livermore      
Entity Address, State or Province CA      
Entity Address, Postal Zip Code 94550      
City Area Code 925      
Local Phone Number 455-9400      
Entity Well-known Seasoned Issuer No      
Entity Voluntary Filers No      
Entity Current Reporting Status No      
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       $ 6.7
Entity Common Stock, Shares Outstanding     2,670,286  
Documents Incorporated by Reference [Text Block] None.      
ICFR Auditor Attestation Flag false      
Document Financial Statement Error Correction [Flag] false      
Auditor Firm ID 2738 1457    
Auditor Name M&K CPAS, PLLC Ernst & Young (Hellas) Certified Auditors Accountants S.A.    
Auditor Location The Woodlands, TX Athens, Greece    
Common Stock, par value $0.0001 per share        
Title of 12(b) Security Common Stock, par value $0.0001 per share      
Trading Symbol ADN      
Security Exchange Name NASDAQ      
Warrants to purchase one share of common stock, each at an exercise price of $345.00        
Title of 12(b) Security Warrants to purchase one share of common stock, each at an exercise price of $345.00      
Trading Symbol ADNWW      
Security Exchange Name NASDAQ