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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Liabilities: |  |
Kolltan acquisition contingent consideration | $ 12,485 | $ 13,779
Fair value | Level 3 |  |
Liabilities: |  |
Kolltan acquisition contingent consideration | 12,485 | 13,779
Fair Value Measurements. | Level 2 |  |
Assets: |  |
Money market funds and cash equivalents | 4,024 | 15,755
Marketable securities | 53,151 | 69,712
Total financial assets at fair value | 57,175 | 85,467
Fair Value Measurements. | Level 3 |  |
Liabilities: |  |
Kolltan acquisition contingent consideration | 12,485 | 13,779
Total financial liabilities at fair value | 12,485 | 13,779
Fair Value Measurements. | Fair value |  |
Assets: |  |
Money market funds and cash equivalents | 4,024 | 15,755
Marketable securities | 53,151 | 69,712
Total financial assets at fair value | 57,175 | 85,467
Liabilities: |  |
Kolltan acquisition contingent consideration | 12,485 | 13,779
Total financial liabilities at fair value | $ 12,485 | $ 13,779

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