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Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Liabilities: |  |
Kolltan acquisition contingent consideration | $ 7,107 | $ 8,267
Fair value | Level 3 |  |
Liabilities: |  |
Kolltan acquisition contingent consideration | 7,107 | 8,267
Fair Value Measurements. | Level 2 |  |
Assets: |  |
Money market funds and cash equivalents | 66,929 | 35,066
Marketable securities | 350,905 | 150,586
Total financial assets at fair value | 417,834 | 185,652
Fair Value Measurements. | Level 3 |  |
Liabilities: |  |
Kolltan acquisition contingent consideration | 7,107 | 8,267
Total financial liabilities at fair value | 7,107 | 8,267
Fair Value Measurements. | Fair value |  |
Assets: |  |
Money market funds and cash equivalents | 66,929 | 35,066
Marketable securities | 350,905 | 150,586
Total financial assets at fair value | 417,834 | 185,652
Liabilities: |  |
Kolltan acquisition contingent consideration | 7,107 | 8,267
Total financial liabilities at fair value | $ 7,107 | $ 8,267

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