| Cover | Apr. 13, 2021 |
| Cover [Abstract] | |
| DocumentType | 8-K |
| Amendment Flag | false |
| Document Period End Date | Apr. 13, 2021 |
| Entity File Number | 001-38538 |
| Entity Registrant Name | electroCore, Inc. |
| Entity Central Index Key | 0001560258 |
| Entity Tax Identification Number | 20-3454976 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 200 Forge Way |
| Entity Address, Address Line Two | Suite 205 |
| Entity Address, City or Town | Rockaway |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 07866 |
| City Area Code | (973) |
| Local Phone Number | 290-0097 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, Par Value $0.001 Per Share |
| Trading Symbol | ECOR |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | true |
