| Document and Entity Information | Mar. 04, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 4, 2022 |
| Entity Registrant Name | EARGO, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39616 |
| Entity Tax Identification Number | 27-3879804 |
| Entity Address, Address Line One | 2665 North First Street |
| Entity Address, Address Line Two | Suite 300 |
| Entity Address, City or Town | San Jose |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 95134 |
| City Area Code | 650 |
| Local Phone Number | 351-7700 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001719395 |
| Title of 12(b) Security | Common Stock, $0.0001 par value per share |
| Trading Symbol | EAR |
| Security Exchange Name | NASDAQ |
