Document and Entity Information
| Document and Entity Information | Aug. 07, 2020 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001660334 |
| Document Type | 8-K |
| Document Period End Date | Aug. 7, 2020 |
| Entity Registrant Name | Verrica Pharmaceuticals Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-38529 |
| Entity Tax Identification Number | 46-3137900 |
| Entity Address, Address Line One | 10 North High Street |
| Entity Address, Address Line Two | Suite 200 |
| Entity Address, City or Town | West Chester |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 19380 |
| City Area Code | (484) |
| Local Phone Number | 453-3300 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock |
| Trading Symbol | VRCA |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |