| Document and Entity Information | Oct. 11, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001580864 |
| Document Type | 8-K |
| Document Period End Date | Oct. 11, 2021 |
| Entity Registrant Name | VROOM, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39315 |
| Entity Tax Identification Number | 90-1112566 |
| Entity Address, Address Line One | 1375 Broadway |
| Entity Address, Address Line Two | Floor 11 |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10018 |
| City Area Code | 855 |
| Local Phone Number | 524-1300 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common stock, $0.001 par value per share |
| Trading Symbol | VRM |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
