| Document and Entity Information | Mar. 08, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 8, 2021 |
| Entity Registrant Name | WAITR HOLDINGS INC. |
| Entity Central Index Key | 0001653247 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-37788 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 26-3828008 |
| Entity Address, Address Line One | 214 Jefferson Street |
| Entity Address, Address Line Two | Suite 200 |
| Entity Address, City or Town | Lafayette |
| Entity Address, State or Province | LA |
| Entity Address, Postal Zip Code | 70501 |
| City Area Code | 337 |
| Local Phone Number | 534-6881 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Common Stock, Par Value $0.0001 Per Share |
| Trading Symbol(s) | WTRH |
| Name of each exchange on which registered | NASDAQ |
