| Document and Entity Information | May 26, 2022 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001699382 |
| Document Type | 8-K |
| Document Period End Date | May 26, 2022 |
| Entity Registrant Name | PMV Pharmaceuticals, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39539 |
| Entity Tax Identification Number | 46-3218129 |
| Entity Address, Address Line One | 8 Clarke Drive |
| Entity Address, Address Line Two | Suite 3 |
| Entity Address, City or Town | Cranbury |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 08512 |
| City Area Code | (609) |
| Local Phone Number | 642-6670 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.00001 par value per share |
| Trading Symbol | PMVP |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
