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Net Income (Loss) Per Share (Tables) | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Schedule of Computation of Basic and Diluted Net Income (Loss) per Share | The following table sets forth the computation of basic and diluted net income (loss) per share (in thousands, except for per share data):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Amounts used for basic and diluted per share calculations: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Agenus Inc. common stockholders |  | $ | 63,860 |  |  | $ | (66,440 | ) |  | $ | 10,531 |  |  | $ | (181,514 | )
Weighted average number of Agenus Inc. common shares outstanding - basic |  |  | 31,886 |  |  |  | 21,550 |  |  |  | 28,184 |  |  |  | 20,995 |
Effect of potentially dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation awards |  |  | 914 |  |  |  | — |  |  |  | 22 |  |  |  | — |
Warrants |  |  | 58 |  |  |  | — |  |  |  | 58 |  |  |  | — |
Weighted average number of Agenus Inc. common shares outstanding - diluted |  |  | 32,858 |  |  |  | 21,550 |  |  |  | 28,264 |  |  |  | 20,995 |
Net income (loss) attributable to Agenus Inc. per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.00 |  |  | $ | (3.08 | ) |  | $ | 0.37 |  |  | $ | (8.65 | )
Diluted |  | $ | 1.94 |  |  | $ | (3.08 | ) |  | $ | 0.37 |  |  | $ | (8.65 | )
Schedule of Anti-dilutive Securities Excluded from Computation of Diluted Weighted Average Shares Outstanding | The following securities (listed on an as-if-converted-to-Common-Stock basis) have been excluded from the computation of diluted weighted average shares outstanding as of September 30, 2025 and 2024, as they would be anti-dilutive (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Warrants |  |  | 974 |  |  |  | 965 |  |  |  | 974 |  |  |  | 965 |
Stock options |  |  | 4,429 |  |  |  | 3,313 |  |  |  | 5,125 |  |  |  | 3,313 |
Non-vested shares |  |  | 74 |  |  |  | 36 |  |  |  | 90 |  |  |  | 36 |
Series A-1 convertible preferred stock |  |  | 17 |  |  |  | 17 |  |  |  | 17 |  |  |  | 17 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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