| Document And Entity Information | 9 Months Ended |
| Sep. 30, 2022 | |
| Document Information Line Items | |
| Entity Registrant Name | Allarity Therapeutics, Inc. |
| Document Type | S-1 |
| Amendment Flag | false |
| Entity Central Index Key | 0001860657 |
| Entity Filer Category | Non-accelerated Filer |
| Entity Small Business | true |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Incorporation, State or Country Code | DE |
