| Cover - USD ($) | 12 Months Ended | ||
| Dec. 31, 2021 | Mar. 03, 2022 | Jun. 30, 2021 | |
| Cover [Abstract] | |||
| Document Type | 10-K/A | ||
| Document Annual Report | true | ||
| Document Period End Date | Dec. 31, 2021 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Document Transition Report | false | ||
| Entity File Number | 001-37788 | ||
| Entity Registrant Name | WAITR HOLDINGS INC. | ||
| 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 | ||
| Title of 12(b) Security | Common Stock, Par Value $0.0001 Per Share | ||
| Trading Symbol | WTRH | ||
| Security Exchange Name | NASDAQ | ||
| Entity Filer Category | Accelerated Filer | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false | ||
| ICFR Auditor Attestation Flag | true | ||
| Entity Shell Company | false | ||
| Entity Public Float | $ 183,791,686 | ||
| Entity Common Stock, Shares Outstanding | 154,034,733 | ||
| Documents Incorporated by Reference | . | ||
| Entity Central Index Key | 0001653247 | ||
| Entity Well-known Seasoned Issuer | No | ||
| Entity Voluntary Filers | No | ||
| Entity Current Reporting Status | Yes | ||
| Document Fiscal Year Focus | 2021 | ||
| Document Fiscal Period Focus | FY | ||
| Amendment Flag | true | ||
| Entity Interactive Data Current | Yes |
| Audit Information | 12 Months Ended |
| Dec. 31, 2021 | |
| Audit Information [Abstract] | |
| Auditor Name | Moss Adams LLP |
| Auditor Location | Los Angeles, California |
| Auditor Firm ID | 659 |
