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License Agreements - Syros (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 programTarget | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
License agreements |  |  |  |
Long term investments |  | $ 187,716 | $ 133,676 |
Unrealized gain (loss) on long term investments |  | 43,893 | (87,590) | $ (24,072)
Syros Pharmaceuticals, Inc. |  |  |  |
License agreements |  |  |  |
Number of program targets | programTarget | 7 |  |  |
Long term investments |  | 700 | 300 |
Unrealized gain (loss) on long term investments |  | $ 400 | $ (2,700) | $ (7,100)
Stock purchase agreement | Syros Pharmaceuticals, Inc. |  |  |  |
License agreements |  |  |  |
Investment owned (in shares) | shares |  | 100,000 |  |

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