| Document and Entity Information | Jan. 09, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | On January 9, 2023, Ra Medical Systems, Inc., a Delaware corporation (the “Company” or “Ra Medical”), completed its acquisition (the “Merger”) of Catheter Precision, Inc., a privately-held Delaware corporation (“Catheter”), pursuant to an Amended and Restated Agreement and Plan of Merger, as reported in the Company’s Current Report on Form 8-K filed with the SEC on January 13, 2023. Catheter’s audited financial statements as of December 31, 2021 and 2020, and for the years then ended, were previously filed with the Company’s Preliminary Proxy Statement dated November 4, 2022. The Company hereby amends the Form 8-K dated January 13, 2023, to include the following financial statements and financial information: • Catheter’s Unaudited Financial Statements as of and for the nine months ended September 30, 2022 and September 30, 2021; • Unaudited Pro Forma Condensed Combined Financial Information related to the Merger as of and for the nine months ended September 30, 2022 and for the year ended December 31, 2021; and • Catheter’s Management’s Discussion and Analysis as of and for the nine months ended September 30, 2022 and September 30, 2021. |
| Document Period End Date | Jan. 09, 2023 |
| Entity Registrant Name | Ra Medical Systems, Inc. |
| Entity Central Index Key | 0001716621 |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity File Number | 001-38677 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 38-3661826 |
| Entity Address, Address Line One | 1670 Highway 160 West, Suite 205 |
| Entity Address, City or Town | Fort Mill |
| Entity Address, State or Province | SC |
| Entity Address, Postal Zip Code | 29708 |
| City Area Code | 973 |
| Local Phone Number | 691-2000 |
| Written Communications | false |
| Soliciting Material | true |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | RMED |
| Security Exchange Name | NYSEAMER |
