| Document and Entity Information - USD ($) $ in Millions | 12 Months Ended | |
| Dec. 31, 2021 | Mar. 31, 2022 | |
| Cover [Abstract] | ||
| Document Type | 10-K/A | |
| Amendment Flag | true | |
| Document Period End Date | Dec. 31, 2021 | |
| Document Fiscal Year Focus | 2021 | |
| Document Fiscal Period Focus | FY | |
| Entity Registrant Name | RxSight, Inc. | |
| Entity Central Index Key | 0001111485 | |
| Entity Tax Identification Number | 94-3268801 | |
| Current Fiscal Year End Date | --12-31 | |
| Entity Current Reporting Status | Yes | |
| Entity Voluntary Filers | Yes | |
| Entity Well-known Seasoned Issuer | No | |
| Entity Filer Category | Non-accelerated Filer | |
| Entity File Number | 001-40690 | |
| Entity Shell Company | false | |
| Entity Emerging Growth Company | true | |
| Entity Ex Transition Period | true | |
| Entity Small Business | true | |
| Entity Interactive Data Current | Yes | |
| Entity Incorporation, State or Country Code | DE | |
| 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 | |
| Trading Symbol | RXST | |
| Title of 12(b) Security | Common stock, $0.001 par value per share | |
| Security Exchange Name | NASDAQ | |
| Entity Common Stock, Shares Outstanding | 27,485,685 | |
| Document Annual Report | true | |
| Document Transition Report | false | |
| Entity Public Float | $ 236 | |
| ICFR Auditor Attestation Flag | false | |
| Amendment Description | RxSight, Inc. (the “Company”) is filing this Amendment No. 1 (this “Amendment No. 1”) to its Annual Report on Form 10-K for the fiscal year ended December 31, 2021, which was originally filed with the Securities and Exchange Commission (“SEC”) on March 8, 2022 (the “Original Form 10-K”) as an exhibits-only filing that updates, amends and supplements Part IV, Item 15 of the Original Form 10-K for the purpose of correctly incorporating by reference Exhibit 3.2, which was inadvertently incorrectly incorporated by reference in the Original Form 10-K. In addition, as required by Rule 12b-15 under the Securities and Exchange Act of 1934, as amended, this Amendment No. 1 includes new Exhibits 31.1 and 31.2, certifications of our Principal Executive Officer and Principal Financial Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, and new Exhibits 32.1 and 32.2, certifications of our Principal Executive Officer and Principal Financial Officer, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.This Amendment No.1 does not affect any other parts of, or exhibits to, the Original Form 10-K, and those unaffected parts or exhibits are not included in this Amendment No. 1. Except as expressly stated in this Amendment No. 1, the Original Form 10-K continues to speak as of the date of the original filing of the Original Form 10-K, and the Company has not updated the disclosure contained in this Amendment No. 1 to reflect events that have occurred since the filing of the Original Form 10-K. Accordingly, this Amendment No. 1 must be read in conjunction with the Company’s other filings made with the SEC subsequent to the filing of the Original Form 10-K, including amendments to those filings, if any. | |
| Auditor Name | Ernst & Young, LLP | |
| Auditor Location | Irvine, California | |
| Auditor Firm ID | 42 |
