| Document and Entity Information | Sep. 11, 2023 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001531177 |
| Document Type | 8-K |
| Document Period End Date | Sep. 11, 2023 |
| Entity Registrant Name | Sight Sciences, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-40587 |
| Entity Tax Identification Number | 80-0625749 |
| Entity Address, Address Line One | 4040 Campbell |
| Entity Address, Address Line Two | Avenue |
| Entity Address, Address Line Three | Suite 100 |
| Entity Address, City or Town | Menlo Park |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94025 |
| City Area Code | (877) |
| Local Phone Number | 266-1144 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.001 par value per share |
| Trading Symbol | SGHT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
