| Document and Entity Information | Dec. 17, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001653247 |
| Document Type | 8-K |
| Document Period End Date | Dec. 17, 2021 |
| Entity Registrant Name | WAITR HOLDINGS INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-37788 |
| 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 |
| Security 12b Title | Common Stock, Par Value $0.0001 Per Share |
| Trading Symbol | WTRH |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
