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Convertible Preferred Stock and Stockholders’ Equity - Part 3 (Details) - USD ($) |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Aug. 15, 2025 | Feb. 24, 2025 | Sep. 26, 2024 | May 31, 2023 | May 09, 2023 | Nov. 18, 2022 | Nov. 10, 2022 | Aug. 31, 2025 | Aug. 31, 2024 | Jan. 31, 2024 | Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025 | Sep. 30, 2024
Convertible Redeemable Preferred Stock and Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  |  | 2,755,184 |  | 312,028 |
Common stock shares outstanding |  |  |  |  |  |  |  |  |  |  | 2,755,154 |  | 311,998 |
Repurchase shares of common stock |  |  |  |  |  |  | 125,000 |  |  |  |  |  |  |
Price per share (in Dollars per share) |  |  |  |  |  | $ 2 | $ 1 |  |  |  |  |  |  |
Repurchases stock (in Dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent warrant liabilities (in Dollars) |  |  |  |  |  |  |  |  |  |  | 24,978 |  | $ 26,590 |
Stock options granted (in Dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares granted |  |  |  | 1 | 28 |  |  |  |  |  |  |  |  |
Restricted shares granted vest |  |  |  |  |  |  |  | 25.00% | 25.00% | 50.00% |  |  |  |
Shares modified |  | 27 |  |  |  |  |  |  |  |  |  |  |  |
Outstanding stock options (in Dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Stock and Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options vested (in Dollars) |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 46,000 |
CEO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Stock and Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares granted |  |  |  |  | 8 |  |  |  |  |  |  |  |  |
CFO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Stock and Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares granted |  |  |  |  | 4 |  |  |  |  |  |  |  |  |
CBO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Stock and Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares granted |  |  |  |  | 8 |  |  |  |  |  |  |  |  |
Board of Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Stock and Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares granted | 494 | 4 | 39 |  |  |  |  |  |  |  |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Stock and Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants purchases |  |  |  |  |  |  |  |  |  |  | 1,136,288 |  |  |
Exercise price, per share (in Dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 26.26 |  |  |
Series C PIPE Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Stock and Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liability (in Dollars) |  |  |  |  |  |  |  |  |  |  | $ 4,700 |  | 6,300 |
Net proceeds (in Dollars) |  |  |  |  |  |  |  |  |  |  | 20,278 |  | 20,290 |
Contingent warrant liabilities (in Dollars) |  |  |  |  |  |  |  |  |  |  | $ 24,978 |  | $ 26,590 |
2022 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Stock and Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserved for issuance shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,411
Available shares |  |  |  |  |  |  |  |  |  |  | 1,752 |  |  |
PMX Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Stock and Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term |  |  |  |  |  |  |  |  |  |  | 11 years |  |  |
Common Stock [Member] | Onconetix Equity Incentive Plans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Stock and Stockholders’ Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserved for issuance shares |  |  |  | 185 |  |  |  |  |  |  |  |  |  |

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