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Convertible Preferred Stock and Stockholders’ Equity - Part 3 (Details) - USD ($)											1 Months Ended			3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 22, 2025	Aug. 15, 2025	Feb. 24, 2025	Sep. 26, 2024	Apr. 16, 2024	Feb. 14, 2024	May 31, 2023	May 09, 2023	Nov. 18, 2022	Nov. 10, 2022	Aug. 31, 2025	Aug. 31, 2024	Jan. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Jun. 24, 2025	Oct. 31, 2024
Convertible Preferred Stock and Stockholders Equity [Line Items]
Common stock, shares issued														1,560,820			1,560,820		138,422	241,514
Common stock shares outstanding														1,560,668			1,560,668		138,270
Repurchase shares of common stock										125,000
Price per share (in Dollars per share)									$ 2	$ 1
Repurchases of common stock (in Dollars)
Deferred offering costs (in Dollars)														150,000			$ 150,000
Warrants outstanding fair value (in Dollars per share)																	$ 5.48
Warrant liability (in Dollars)														12,815,000			$ 12,815,000
Proceeds from issuance of warrants (in Dollars)	$ 12,900,000
Contingent warrant liabilities (in Dollars)														$ 53,149			$ 53,149		$ 43,089
Settlement share														461			461		461
Stock options granted (in Dollars)
Fair value of stock options (in Dollars)																$ 163
Restricted shares granted							7	44
Restricted shares granted vest											25.00%	25.00%	50.00%
Shares modified								137
Stock options outstanding					144
Weighted average exercise price (in Dollars per share)																					$ 294.1
Outstanding stock options (in Dollars)
Warrant [Member]
Convertible Preferred Stock and Stockholders Equity [Line Items]
Warrants exercisable														4,376,652			4,376,652
Exercise price per share (in Dollars per share)	$ 3.6896
Series C PIPE Warrants [Member]
Convertible Preferred Stock and Stockholders Equity [Line Items]
Warrant liability (in Dollars)														$ 32,892			$ 32,892		32,982
Proceeds from issuance of warrants (in Dollars)																	$ 20,257		10,200
At the Market Offering Agreement [Member]
Convertible Preferred Stock and Stockholders Equity [Line Items]
Deferred offering costs (in Dollars)																			$ 300,000
Equity Option [Member]
Convertible Preferred Stock and Stockholders Equity [Line Items]
Exercise price per share (in Dollars per share)
Fair value of stock options (in Dollars)														$ 17,000	$ 53,000		$ 109,000	$ 220,000
Stock option outstanding shares														120			120		162
Weighted average exercise price (in Dollars per share)														$ 14,089.83			$ 14,089.83		$ 13,258.74
Chief Executive Officer [Member]
Convertible Preferred Stock and Stockholders Equity [Line Items]
Restricted shares granted								143
Chief Financial Officer [Member]
Convertible Preferred Stock and Stockholders Equity [Line Items]
Restricted shares granted								44
CBO’s [Member]
Convertible Preferred Stock and Stockholders Equity [Line Items]
Restricted shares granted								22
Board of Directors [Member]
Convertible Preferred Stock and Stockholders Equity [Line Items]
Restricted shares granted		2,492	20	195
Aggregate of stock options						1
Expense (in Dollars)																			$ 18,000
Other Current Liabilities [Member] | Series C PIPE Warrants [Member]
Convertible Preferred Stock and Stockholders Equity [Line Items]
Contingent warrant liabilities (in Dollars)														$ 53,149			$ 53,149		$ 43,089
2022 Plan [Member]
Convertible Preferred Stock and Stockholders Equity [Line Items]
Reserved for issuance shares															17,058			17,058
Available shares														6,165			6,165
PMX Option Plan [Member]
Convertible Preferred Stock and Stockholders Equity [Line Items]
Expected term																	11 years
Stock option outstanding shares																					684
Series D Preferred Stock [Member] | Warrant [Member]
Convertible Preferred Stock and Stockholders Equity [Line Items]
Warrants exercisable	4,362,827													4,362,827			4,362,827
Common Stock [Member] | Onconetix Equity Incentive Plans [Member]
Convertible Preferred Stock and Stockholders Equity [Line Items]
Reserved for issuance shares							926
IPO [Member]
Convertible Preferred Stock and Stockholders Equity [Line Items]
Settlement share														6,963			6,963		6,963

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