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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Liabilities: |  |
Kolltan acquisition contingent consideration | $ 8,267 | $ 12,485
Fair value | Level 3 |  |
Liabilities: |  |
Kolltan acquisition contingent consideration | 8,267 | 12,485
Fair Value Measurements. | Level 2 |  |
Assets: |  |
Money market funds and cash equivalents | 35,066 | 4,024
Marketable securities | 150,586 | 53,151
Total financial assets at fair value | 185,652 | 57,175
Fair Value Measurements. | Level 3 |  |
Liabilities: |  |
Kolltan acquisition contingent consideration | 8,267 | 12,485
Total financial liabilities at fair value | 8,267 | 12,485
Fair Value Measurements. | Fair value |  |
Assets: |  |
Money market funds and cash equivalents | 35,066 | 4,024
Marketable securities | 150,586 | 53,151
Total financial assets at fair value | 185,652 | 57,175
Liabilities: |  |
Kolltan acquisition contingent consideration | 8,267 | 12,485
Total financial liabilities at fair value | $ 8,267 | $ 12,485

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