| Document And Entity Information | Dec. 29, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 29, 2021 |
| Entity Registrant Name | RxSight, Inc. |
| Entity Central Index Key | 0001111485 |
| Entity Emerging Growth Company | true |
| Entity File Number | 001-40690 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 94-3268801 |
| Entity Address, Address Line One | 100 Columbia |
| Entity Address, City or Town | Aliso Viejo |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92656 |
| City Area Code | 949 |
| Local Phone Number | 521-7830 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | true |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | RXST |
| Security Exchange Name | NASDAQ |
