| Document and Entity Information | Nov. 06, 2019 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 6, 2019 |
| Entity File Number | 001-37625 |
| Entity Registrant Name | Voyager Therapeutics, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 46-3003182 |
| Entity Address, Address Line One | 75 Sidney Street |
| Entity Address, State or Province | MA |
| Entity Address, City or Town | Cambridge |
| Entity Address, Postal Zip Code | 02139 |
| City Area Code | 857 |
| Local Phone Number | 259-5340 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.001 par value |
| Trading Symbol | VYGR |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
| Entity Central Index Key | 0001640266 |
| Amendment Flag | false |
