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Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Level 2 |  |
Liabilities: |  |
Fair value of liability | $ 863,300 |
Recurring |  |
Financial Assets: |  |
Total financial assets | 984,299 | $ 717,596
Recurring | Money market deposits |  |
Financial Assets: |  |
Total financial assets | 55,703 | 28,990
Recurring | U.S. Treasury securities |  |
Financial Assets: |  |
Total financial assets | 787,875 | 597,744
Recurring | Corporate bonds and notes |  |
Financial Assets: |  |
Total financial assets | 52,721 | 12,328
Recurring | Municipal securities |  |
Financial Assets: |  |
Total financial assets | 88,000 | 78,534
Recurring | Level 1 |  |
Financial Assets: |  |
Total financial assets | 843,578 | 626,734
Recurring | Level 1 | Money market deposits |  |
Financial Assets: |  |
Total financial assets | 55,703 | 28,990
Recurring | Level 1 | U.S. Treasury securities |  |
Financial Assets: |  |
Total financial assets | 787,875 | 597,744
Recurring | Level 2 |  |
Financial Assets: |  |
Total financial assets | 140,721 | 90,862
Recurring | Level 2 | Corporate bonds and notes |  |
Financial Assets: |  |
Total financial assets | 52,721 | 12,328
Recurring | Level 2 | Municipal securities |  |
Financial Assets: |  |
Total financial assets | $ 88,000 | $ 78,534

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