Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Nov. 20, 2019
Document And Entity Information [Abstract]    
Entity Registrant Name Ra Medical Systems, Inc.  
Entity Central Index Key 0001716621  
Document Type 10-Q  
Document Period End Date Jun. 30, 2019  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Trading Symbol RMED  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   13,407,995
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Emerging Growth Company true  
Entity Small Business true  
Entity Ex transition period false  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity File Number 001-38677  
Entity Tax Identification Number 383661826  
Entity Address, Address Line One 2070 Las Palmas Drive  
Entity Address, City or Town Carlsbad  
Entity Address, State or Province California  
Entity Address, Postal Zip Code 92011  
City Area Code 760  
Local Phone Number 804-1648