Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2025	Nov. 13, 2025
Document Information [Line Items]
Entity Central Index Key	0001860657
Entity Registrant Name	Allarity Therapeutics, Inc.
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2025
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2025
Document Transition Report	false
Entity File Number	001-41160
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	87-2147982
Entity Address, Address Line One	123 E Tarpon Ave
Entity Address, City or Town	Tarpon Springs
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	34689
City Area Code	401
Local Phone Number	426-4664
Title of 12(b) Security	Common Stock, $0.0001 par value per share
Trading Symbol	ALLR
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		15,811,886