Cover
| Cover | Dec. 22, 2021 | Dec. 21, 2021 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Amendment Flag | false | |
| Document Period End Date | Dec. 21, 2021 | |
| Entity File Number | 001-41160 | |
| Entity Registrant Name | Allarity Therapeutics, Inc. | |
| Entity Central Index Key | 0001860657 | |
| Entity Tax Identification Number | 87-2147982 | |
| Entity Incorporation, State or Country Code | DE | |
| Entity Address, Address Line One | 210 Broadway | |
| Entity Address, Address Line Two | Suite 201 | |
| Entity Address, City or Town | Cambridge | |
| Entity Address, State or Province | MA | |
| Entity Address, Postal Zip Code | 02139 | |
| City Area Code | (401) | |
| Local Phone Number | 426-4664 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share | |
| Trading Symbol | ALLR | |
| Security Exchange Name | NASDAQ | |
| Entity Emerging Growth Company | true | |
| Elected Not To Use the Extended Transition Period | false | |
| Entity Information, Former Legal or Registered Name | Not applicable |