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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair value | Level 3 |  |
Liabilities: |  |
Kolltan acquisition contingent consideration | $ 13,779 | $ 43,400
Fair Value Measurements | Level 2 |  |
Assets: |  |
Money market funds and cash equivalents | 15,755 | 24,061
Marketable securities | 69,712 | 99,139
Total financial assets at fair value | 85,467 | 123,200
Fair Value Measurements | Level 3 |  |
Liabilities: |  |
Kolltan acquisition contingent consideration | 13,779 | 43,400
Total financial liabilities at fair value | 13,779 | 43,400
Fair Value Measurements | Fair value |  |
Assets: |  |
Money market funds and cash equivalents | 15,755 | 24,061
Marketable securities | 69,712 | 99,139
Total financial assets at fair value | 85,467 | 123,200
Liabilities: |  |
Kolltan acquisition contingent consideration | 13,779 | 43,400
Total financial liabilities at fair value | $ 13,779 | $ 43,400

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