| Cover | Nov. 10, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | VolitionRx Limited |
| Entity Central Index Key | 0000093314 |
| Document Type | 8-K |
| Amendment Flag | false |
| Entity Emerging Growth Company | false |
| Document Period End Date | Nov. 10, 2021 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36833 |
| Entity Tax Identification Number | 91-1949078 |
| Entity Address Address Line 1 | 13215 Bee Cave Parkway |
| Entity Address Address Line 2 | Suite 125 |
| Entity Address Address Line 3 | Galleria Oaks B |
| Entity Address City Or Town | Austin |
| Entity Address State Or Province | TX |
| Entity Address Postal Zip Code | 78738 |
| City Area Code | 646 |
| Local Phone Number | 650-1351 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock,par value $0.001 per share |
| Trading Symbol | VNRX |
| Security Exchange Name | NYSEAMER |
