| Cover | Nov. 05, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 5, 2020 |
| Entity Registrant Name | Adverum Biotechnologies, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36579 |
| Entity Tax Identification Number | 20-5258327 |
| Entity Address, Address Line One | 800 Saginaw Drive |
| Entity Address, City or Town | Redwood City |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94063 |
| City Area Code | 650 |
| Local Phone Number | 656-9323 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | ADVM |
| Entity Central Index Key | 0001501756 |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Security Exchange Name | NASDAQ |
