| Document and Entity Information | Mar. 10, 2022 |
| Cover [Abstract] | |
| Entity Registrant Name | Viridian Therapeutics, Inc.\DE |
| Amendment Flag | false |
| Entity Central Index Key | 0001590750 |
| Document Type | 8-K |
| Document Period End Date | Mar. 10, 2022 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36483 |
| Entity Tax Identification Number | 47-1187261 |
| Entity Address, Address Line One | 221 Crescent Street |
| Entity Address, Address Line Two | Suite 401 |
| Entity Address, City or Town | Waltham |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02453 |
| City Area Code | (617) |
| Local Phone Number | 272-4600 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.01 par value |
| Trading Symbol | VRDN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
