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Assets and Liabilities Measured at Fair Value - Components by Hierarchy Level (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Fair value of assets | $ 210,711 | $ 324,055
Liabilities: |  |
Contingent consideration payable | 27,317 | 25,825
Deferred compensation plan liability | 4,233 | 4,078
Fair value of liabilities | 31,550 | 29,903
Commercial paper |  |
Assets: |  |
Fair value of assets | 147,339 | 217,095
Asset-backed securities |  |
Assets: |  |
Fair value of assets | 20,680 | 9,438
Corporate debt securities |  |
Assets: |  |
Fair value of assets | 12,039 | 39,513
U.S. government agency bonds |  |
Assets: |  |
Fair value of assets | 26,071 | 53,582
Money market funds |  |
Assets: |  |
Fair value of assets | 4,582 | 4,427
Level 2 |  |
Assets: |  |
Fair value of assets | 210,711 | 324,055
Liabilities: |  |
Contingent consideration payable | 0 | 0
Deferred compensation plan liability | 4,233 | 4,078
Fair value of liabilities | 4,233 | 4,078
Fair value of the convertible notes | 4,400 |
Level 2 | Commercial paper |  |
Assets: |  |
Fair value of assets | 147,339 | 217,095
Level 2 | Asset-backed securities |  |
Assets: |  |
Fair value of assets | 20,680 | 9,438
Level 2 | Corporate debt securities |  |
Assets: |  |
Fair value of assets | 12,039 | 39,513
Level 2 | U.S. government agency bonds |  |
Assets: |  |
Fair value of assets | 26,071 | 53,582
Level 2 | Money market funds |  |
Assets: |  |
Fair value of assets | 4,582 | 4,427
Level 3 |  |
Liabilities: |  |
Contingent consideration payable | 27,317 | 25,825
Deferred compensation plan liability | 0 | 0
Fair value of liabilities | $ 27,317 | $ 25,825

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