| Document and Entity Information | Aug. 09, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 09, 2022 |
| Entity Registrant Name | VIRACTA THERAPEUTICS, INC. |
| Entity Central Index Key | 0001061027 |
| Entity Emerging Growth Company | false |
| Entity File Number | 000-51531 |
| Entity Incorporation State Country Code | DE |
| Entity Tax Identification Number | 94-3295878 |
| Entity Address, Address Line One | 2533 S. Coast Hwy. 101 |
| Entity Address, Address Line Two | Suite 210 |
| Entity Address, City or Town | Cardiff |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92007 |
| City Area Code | (858) |
| Local Phone Number | 400-8470 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.0001 per share |
| Trading Symbol | VIRX |
| Security Exchange Name | NASDAQ |
