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Organization - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 14, 2026 | Jul. 25, 2025 | Jun. 30, 2026 | Mar. 31, 2026 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025 | Jul. 24, 2025
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |
Exchange ratio in a reverse recapitalization of shares converted |  | 0.3051% |  |  |  |  |  |  |  |
Accumulated deficit |  |  | $ (250,850) |  |  |  | $ (250,850) |  | $ (230,053) |
Additional paid-in capital |  |  | 392,964 |  |  |  | 392,964 |  | $ 363,094 |
Net loss |  |  | (10,178) | $ (10,619) | $ (7,585) | $ (6,077) | (20,797) | $ (13,662) |  |
Cash, cash equivalents and marketable securities |  |  | $ 136,200 |  |  |  | $ 136,200 |  |  |
Ikena Oncology, Inc | 2025 PIPE Financing |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  | 2,508,337 |  |  |  |  |  |  |  |
Reverse Stock Split, at a price |  | $ 29.9 |  |  |  |  |  |  |  |
Aggregate gross proceeds |  | $ 75,000 |  |  |  |  |  |  |  |
Voting Common Stock |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  | 11,279,130 |  |  |  | 11,279,130 |  | 10,650,925 |
Common stock, par value |  |  | $ 0.001 |  |  |  | $ 0.001 |  | $ 0.001 |
Common Stock | Ikena Oncology, Inc |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  | 8.33% |  |  |  |  |  |  |  |
Reverse stock split |  | 1-for-12 |  |  |  |  |  |  |  |
Exchange ratio in a reverse recapitalization of shares converted |  | 0.3051% |  |  |  |  |  |  |  |
Pre-funded Warrants | Voting Common Stock | 2026 Private Placement |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants issued and sold to purchase warrant shares | 5,770,335 |  |  |  |  |  |  |  |  |
Purchase price of warrants | $ 5.199 |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of warrants | $ 30,000 |  |  |  |  |  |  |  |  |
Non-OX40 Divestiture |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  |  |  |  |  |  |  |  | $ 1,500 |
Net assets |  |  |  |  |  |  |  |  | 5,200 |
Cash transferred to buyer for divestiture |  |  |  |  |  |  |  |  | 5,200 |
Gain (loss) on disposition of business |  |  |  |  |  |  |  |  | $ 0 |
Non-OX40 Divestiture | Promissory Note |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |
Note receivable value |  | $ 8,900 | $ 8,900 |  |  |  | $ 8,900 |  |  |
Assets measure at fair value |  | $ 6,700 |  |  |  |  |  |  |  |
Ikena CVR Agreement | Contingent Payments Made to Company |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |
CVR holder proceeds percentage |  |  |  |  |  |  |  |  |  | 100.00%
Ikena CVR Agreement | Payments Received Under Disposition Agreements |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |
CVR holder proceeds percentage |  |  |  |  |  |  |  |  |  | 90.00%
Legacy Inmagene CVR Agreement | Contingent Payments Made to Company |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |
CVR holder proceeds percentage |  |  |  |  |  |  |  |  |  | 100.00%
Legacy Inmagene CVR Agreement | Payments Received Under Disposition Agreements |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |
CVR holder proceeds percentage |  |  |  |  |  |  |  |  |  | 90.00%
Securities Purchase Agreement | Pre-funded Warrants | Voting Common Stock | 2026 Private Placement |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants issued and sold to purchase warrant shares | 5,770,335 |  |  |  |  |  |  |  |  |
Common stock, par value | $ 0.001 |  |  |  |  |  |  |  |  |
Purchase price of warrants | $ 5.199 |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of warrants | $ 30,000 |  |  |  |  |  |  |  |  |

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