| Document and Entity Information | Mar. 08, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | TheRealReal, Inc. |
| Amendment Flag | false |
| Entity Central Index Key | 0001573221 |
| Document Type | 8-K |
| Document Period End Date | Mar. 8, 2021 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-38953 |
| Entity Tax Identification Number | 45-1234222 |
| Entity Address, Address Line One | 55 Francisco Street 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common stock, $0.00001 par value |
| Trading Symbol | REAL |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
