| Document and Entity Information | Dec. 01, 2020 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001720725 |
| Document Type | 8-K |
| Document Period End Date | Dec. 1, 2020 |
| Entity Registrant Name | Oyster Point Pharma, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39112 |
| Entity Tax Identification Number | 81-1030955 |
| Entity Address, Address Line One | 202 Carnegie Center |
| Entity Address, Address Line Two | Suite 109 |
| Entity Address, City or Town | Princeton |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 08540 |
| City Area Code | (609) |
| Local Phone Number | 382-9032 |
| 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 | OYST |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
