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Cover
Sep. 18, 2024
Cover [Abstract]  
Document Type 8-K/A
Amendment Flag true
Amendment Description On September 24, 2024, Onconetix, Inc. (the “Company”) effected a reverse stock split (the “Reverse Stock Split”) of all of the outstanding shares of the Company’s issued and outstanding common stock at a ratio of one-for-forty (1:40). Unless otherwise indicated, all share amounts and share prices disclosed herein are presented on a post-split basis. 
Document Period End Date Sep. 18, 2024
Current Fiscal Year End Date --12-31
Entity File Number 001-41294
Entity Registrant Name Onconetix, Inc.
Entity Central Index Key 0001782107
Entity Tax Identification Number 83-2262816
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 201 E. Fifth Street
Entity Address, Address Line Two Suite 1900
Entity Address, City or Town Cincinnati
Entity Address, State or Province OH
Entity Address, Postal Zip Code 45202
City Area Code 513
Local Phone Number 620-4101
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 $0.00001 per share
Trading Symbol ONCO
Security Exchange Name NASDAQ
Entity Emerging Growth Company false