Document and Entity Information - shares
9 Months Ended
Sep. 30, 2019
Oct. 31, 2019
Cover [Abstract]    
Entity registrant name TheRealReal, Inc.  
Trading symbol REAL  
Entity central index key 0001573221  
Current fiscal year end date --12-31  
Entity filer category Non-accelerated Filer  
Document type 10-Q  
Document period end date Sep. 30, 2019  
Document fiscal year focus 2019  
Document fiscal period focus Q3  
Amendment flag false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Small Business false  
Entity Interactive Data Current Yes  
Entity common stock, shares outstanding   85,791,236
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity File Number 001-38953  
Entity Tax Identification Number 45-1234222  
Entity Address, Address Line One 55 Francisco Street  
Entity Address, Address Line Two Suite 600  
Entity Address, City or Town San Francisco  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94133  
City Area Code 855  
Local Phone Number 435-5893  
Title of 12(b) Security Common stock, $0.00001 par value  
Security Exchange Name NASDAQ  
Document Quarterly Report true  
Document Transition Report false  
Entity Incorporation, State or Country Code DE