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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2010 cvr | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 18, 2023 contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag |  | Derivative assets(2) | Derivative assets(2) |
Number of CVR Series | cvr | 4 |  |  |
Agenus Partnered Program |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Percentage of milestones (as a percent) |  |  |  | 50.00%
Agenus Partnered Program | Discount Rate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Discount rate (as a percent) |  |  | 0.25 |
Primordial Genetics | Agenus Partnered Program |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Number of contracts | contract |  |  |  | 2
Transferred over Time | Phase 3 clinical trial |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Gross contract asset |  | $ 10,000,000 |  |
Maximum | Agenus Partnered Program | Discount Rate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Discount rate (as a percent) |  | 0.28 |  |
Maximum | Transferred over Time | Development, regulatory, & commercial milestones and tiered royalties |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Investments |  | $ 375,000,000 |  |
Minimum | Agenus Partnered Program | Discount Rate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Discount rate (as a percent) |  | 0.15 |  |
Metabasis |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Number of CVRs issued per acquiree share | cvr | 4 |  |  |
Number of CVRs issued from each CVR series | cvr | 1 |  |  |
Frequency of cash payments to CVR holders | 6 months |  |  |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Total liabilities |  |  | $ 320,000 |
Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Investment in Viking common stock |  | $ 40,240,000 | 32,185,000 |
Derivative asset |  | 10,583,000 | 3,531,000 |
Total assets |  | 194,441,000 | 150,886,000 |
Total liabilities |  | 3,681,000 | 3,198,000 |
Recurring | Short-term investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Investments, fair value |  | 143,618,000 | 115,170,000 |
Recurring | Contingent liabilities | CyDex |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Contingent liabilities |  | 383,000 | 320,000 |
Recurring | Contingent liabilities | Metabasis |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Contingent liabilities |  | 3,298,000 | 2,878,000 |
Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Investment in Viking common stock |  | 40,240,000 | 32,185,000 |
Derivative asset |  | 0 | 0 |
Total assets |  | 122,047,000 | 39,476,000 |
Total liabilities |  | 0 | 0 |
Recurring | Level 1 | Short-term investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Investments, fair value |  | 81,807,000 | 7,291,000 |
Recurring | Level 1 | Contingent liabilities | CyDex |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Contingent liabilities |  | 0 | 0 |
Recurring | Level 1 | Contingent liabilities | Metabasis |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Contingent liabilities |  | 0 | 0 |
Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Investment in Viking common stock |  | 0 | 0 |
Derivative asset |  | 0 | 0 |
Total assets |  | 61,811,000 | 107,879,000 |
Total liabilities |  | 3,298,000 | 2,878,000 |
Recurring | Level 2 | Short-term investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Investments, fair value |  | 61,811,000 | 107,879,000 |
Recurring | Level 2 | Contingent liabilities | CyDex |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Contingent liabilities |  | 0 | 0 |
Recurring | Level 2 | Contingent liabilities | Metabasis |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Contingent liabilities |  | 3,298,000 | 2,878,000 |
Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Investment in Viking common stock |  | 0 | 0 |
Derivative asset |  | 10,583,000 | 3,531,000 |
Total assets |  | 10,583,000 | 3,531,000 |
Total liabilities |  | 383,000 |  |
Recurring | Level 3 | Short-term investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Investments, fair value |  | 0 | 0 |
Recurring | Level 3 | Contingent liabilities | CyDex |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Contingent liabilities |  | 383,000 | 320,000 |
Recurring | Level 3 | Contingent liabilities | Metabasis |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Contingent liabilities |  | $ 0 | $ 0 |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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