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Fair Value - Summary of the Company's Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair value |  |
Debt securities | $ 407,344 |
Contingent consideration | 29,100 | $ 32,500
Recurring Basis |  |
Fair value |  |
Cash equivalents | 1,872 | 41,849
Contingent consideration | 29,061 | 32,451
Assets, Total | 438,277 | 457,472
Recurring Basis | Level 1 |  |
Fair value |  |
Cash equivalents | 1,872 | 41,849
Assets, Total | 78,209 | 115,300
Recurring Basis | Level 2 |  |
Fair value |  |
Assets, Total | 331,007 | 308,744
Recurring Basis | Level 3 |  |
Fair value |  |
Contingent consideration | 29,061 | 32,451
Assets, Total | 29,061 | 33,428
U.S. government and agency debt securities | Recurring Basis |  |
Fair value |  |
Debt securities | 113,796 | 103,345
U.S. government and agency debt securities | Recurring Basis | Level 1 |  |
Fair value |  |
Debt securities | 76,337 | 73,451
U.S. government and agency debt securities | Recurring Basis | Level 2 |  |
Fair value |  |
Debt securities | 37,459 | 29,894
Corporate debt securities | Recurring Basis |  |
Fair value |  |
Debt securities | 189,550 | 184,956
Corporate debt securities | Recurring Basis | Level 2 |  |
Fair value |  |
Debt securities | 189,550 | 183,979
Corporate debt securities | Recurring Basis | Level 3 |  |
Fair value |  |
Debt securities |  | 977
International government agency debt securities | Recurring Basis |  |
Fair value |  |
Debt securities | 103,998 | 94,871
International government agency debt securities | Recurring Basis | Level 2 |  |
Fair value |  |
Debt securities | $ 103,998 | $ 94,871

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