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Acquisitions - Narrative (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
May 30, 2024 | Feb. 05, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Research and development |  |  | $ 573,174 |  | $ 375,709 | $ 2,140,814 | $ 1,183,100
Escient |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Payments for asset acquisitions | $ 782,500 |  |  |  |  |  |
Asset acquisition, consideration transferred, transaction cost | 2,500 |  |  |  |  |  |
Asset acquisition, consideration transferred | 785,000 |  |  |  |  |  |
Asset acquisition, compensation expense |  |  |  |  |  | $ 31,500 |
In-process research and development assets | 679,388 |  |  |  |  |  |
Research and development |  |  |  | $ 679,400 |  |  |
Escient | In Process Research and Development - INCB000262 |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
In-process research and development assets | 644,800 |  |  |  |  |  |
Escient | In Process Research and Development - INCB000547 |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
In-process research and development assets | $ 34,600 |  |  |  |  |  |
Maximum | Xencor |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Uncured material breach, written notice period (in days) |  | 120 days |  |  |  |  |
Payment obligation breach, written notice period (in days) |  | 30 days |  |  |  |  |
Minimum | Xencor |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Advance written notice period (in days) |  | 90 days |  |  |  |  |
Development and Regulatory Milestones | Maximum | Xencor |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Additional milestone payments under the license agreement |  | $ 186,500 |  |  |  |  |
Commercialization Milestones | Maximum | Xencor |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Additional milestone payments under the license agreement |  | $ 50,000 |  |  |  |  |
Expiration period (in years) |  | 11 years |  |  |  |  |
MorphoSys AG |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Payment to acquire license agreement |  | $ 25,000 |  |  |  |  |

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