| Document And Entity Information | May 10, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 10, 2022 |
| Entity Registrant Name | Sight Sciences, Inc. |
| Entity Central Index Key | 0001531177 |
| Entity Emerging Growth Company | true |
| Entity File Number | 001-40587 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 80-0625749 |
| Entity Address, Address Line One | 4040 Campbell Avenue |
| Entity Address, Address Line Two | 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 |
| Entity Information, Former Legal or Registered Name | N/A |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | false |
| Title of 12(b) Security | Common Stock, $0.001 par value per share |
| Trading Symbol | SGHT |
| Security Exchange Name | NASDAQ |
