| Cover | Apr. 21, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Apr. 21, 2023 |
| Entity Registrant Name | Vallon Pharmaceuticals, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40034 |
| Entity Tax Identification Number | 82-4369909 |
| Entity Address, Address Line One | 100 N. 18th Street |
| Entity Address, Address Line Two | Suite 300 |
| Entity Address, City or Town | Philadelphia |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 19103 |
| City Area Code | 267 |
| Local Phone Number | 207-3606 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | GRI |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001824293 |
| Current Fiscal Year End Date | --12-31 |
| Amendment Flag | false |
