| Document and Entity Information | Sep. 01, 2021 |
| Entity Listings [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 1, 2021 |
| Entity Registrant Name | Advent Technologies Holdings, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-38742 |
| Entity Tax Identification Number | 83-0982969 |
| Entity Address, Address Line One | 200 Clarendon Street |
| Entity Address, City or Town | Boston |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02116 |
| City Area Code | 617 |
| Local Phone Number | 655-6000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001744494 |
| Common Stock [Member] | |
| Entity Listings [Line Items] | |
| 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 $11.50 [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Warrants to purchase one share of common stock, each at an exercise price of $11.50 |
| Trading Symbol | ADNWW |
| Security Exchange Name | NASDAQ |
