| Cover | Sep. 14, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 14, 2021 |
| Entity File Number | 001-36672 |
| Entity Registrant Name | EYEGATE PHARMACEUTICALS, INC. |
| Entity Central Index Key | 0001372514 |
| Entity Tax Identification Number | 98-0443284 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 271 Waverley Oaks Road |
| Entity Address, Address Line Two | Suite 108 |
| Entity Address, City or Town | Waltham |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02452 |
| City Area Code | 781 |
| Local Phone Number | 788-9043 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | EYEG |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
