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Assets and Liabilities Measured at Fair Value - Components by Hierarchy Level (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Fair value of assets | $ 148,251 | $ 314,270
Liabilities: |  |
Contingent consideration payable | 24,327 | 22,681
Deferred compensation plan liability | 3,312 | 4,419
Fair value of liabilities | 27,639 | 27,100
Commercial paper |  |
Assets: |  |
Fair value of assets | 59,902 | 73,710
Asset-backed securities |  |
Assets: |  |
Fair value of assets | 33,182 | 77,810
Corporate debt securities |  |
Assets: |  |
Fair value of assets | 51,532 | 145,991
U.S. government agency bonds |  |
Assets: |  |
Fair value of assets |  | 11,991
Money market funds |  |
Assets: |  |
Fair value of assets | 3,635 | 4,768
Level 2 |  |
Assets: |  |
Fair value of assets | 148,251 | 314,270
Liabilities: |  |
Contingent consideration payable | 0 | 0
Deferred compensation plan liability | 3,312 | 4,419
Fair value of liabilities | 3,312 | 4,419
Fair value of the Convertible Notes | 7,300 |
Level 2 | Commercial paper |  |
Assets: |  |
Fair value of assets | 59,902 | 73,710
Level 2 | Asset-backed securities |  |
Assets: |  |
Fair value of assets | 33,182 | 77,810
Level 2 | Corporate debt securities |  |
Assets: |  |
Fair value of assets | 51,532 | 145,991
Level 2 | U.S. government agency bonds |  |
Assets: |  |
Fair value of assets |  | 11,991
Level 2 | Money market funds |  |
Assets: |  |
Fair value of assets | 3,635 | 4,768
Level 3 |  |
Liabilities: |  |
Contingent consideration payable | 24,327 | 22,681
Deferred compensation plan liability | 0 | 0
Fair value of liabilities | $ 24,327 | $ 22,681

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