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License Agreements - Merus (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 item | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($)
License Agreements |  |  |  |  |
Gain (loss) on equity investments |  | $ 8,558 | $ (12,982) | $ 3,064 | $ 126,206
Merus |  |  |  |  |
License Agreements |  |  |  |  |
Gain (loss) on equity investments |  |  | $ (4,100) |  | $ 106,100
Merus |  |  |  |  |
License Agreements |  |  |  |  |
Number of independent programs | item | 10 |  |  |  |

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