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License Agreements - Merus (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 82 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 31, 2023 USD ($) shares | Jan. 31, 2023 USD ($) | Dec. 31, 2016 item | Sep. 30, 2023 USD ($) shares | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) shares | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) shares | Dec. 31, 2022 USD ($)
License Agreements |  |  |  |  |  |  |  |  |
Unrealized (loss) gain on long term investments |  |  |  | $ (26,654) | $ (660) | $ 9,839 | $ (72,142) |  |
Merus |  |  |  |  |  |  |  |  |
License Agreements |  |  |  |  |  |  |  |  |
Purchase of common stock under Stock Purchase Agreement (in shares ) | shares | 500,000 |  |  |  |  |  |  |  |
Purchase price of common stock | $ 10,000 |  |  |  |  |  |  |  |
Common stock held from investment (in shares) | shares |  |  |  | 4,000,000 |  | 4,000,000 |  | 4,000,000 |
Fair market value of our long term investments |  |  |  | $ 94,400 |  | $ 94,400 |  | $ 94,400 | $ 54,900
Unrealized (loss) gain on long term investments |  |  |  | $ (9,100) | $ (9,300) | $ 29,500 | $ (41,800) |  |
Merus |  |  |  |  |  |  |  |  |
License Agreements |  |  |  |  |  |  |  |  |
Number of independent programs | item |  |  | 10 |  |  |  |  |  |
Milestone payment made under license agreement | $ 2,500 | $ 2,500 |  |  |  |  |  | $ 8,000 |

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