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Investments and Fair Value of Financial Instruments - Financial Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financial Assets |  |
Assets, Fair Value Disclosure | $ 246,766 | $ 208,692
Commercial paper |  |
Financial Assets |  |
Marketable investments | 31,445 | 39,756
Certificate of Deposit |  |
Financial Assets |  |
Marketable investments | 4,636 | 6,401
U.S. treasury |  |
Financial Assets |  |
Marketable investments | 13,068 | 10,066
U.S. states and municipalities |  |
Financial Assets |  |
Marketable investments | 891 | 2,915
Corporate bonds |  |
Financial Assets |  |
Marketable investments | 40,320 | 62,563
Non-marketable investments |  |
Financial Assets |  |
Marketable investments | 10,000 |
Commercial paper |  |
Financial Assets |  |
Cash equivalents | 30,555 |
Certificate of Deposit |  |
Financial Assets |  |
Cash equivalents | 4,901 |
Money market funds |  |
Financial Assets |  |
Cash equivalents | 57,278 | 86,991
U.S. treasury |  |
Financial Assets |  |
Cash equivalents | 53,672 |
Level 1 |  |
Financial Assets |  |
Assets, Fair Value Disclosure | 124,018 | 97,057
Level 1 | Commercial paper |  |
Financial Assets |  |
Marketable investments | 0 | 0
Level 1 | Certificate of Deposit |  |
Financial Assets |  |
Marketable investments | 0 | 0
Level 1 | U.S. treasury |  |
Financial Assets |  |
Marketable investments | 13,068 | 10,066
Level 1 | U.S. states and municipalities |  |
Financial Assets |  |
Marketable investments | 0 | 0
Level 1 | Corporate bonds |  |
Financial Assets |  |
Marketable investments | 0 | 0
Level 1 | Non-marketable investments |  |
Financial Assets |  |
Marketable investments | 0 |
Level 1 | Commercial paper |  |
Financial Assets |  |
Cash equivalents | 0 |
Level 1 | Certificate of Deposit |  |
Financial Assets |  |
Cash equivalents | 0 |
Level 1 | Money market funds |  |
Financial Assets |  |
Cash equivalents | 57,278 | 86,991
Level 1 | U.S. treasury |  |
Financial Assets |  |
Cash equivalents | 53,672 |
Level 2 |  |
Financial Assets |  |
Assets, Fair Value Disclosure | 112,748 | 111,635
Level 2 | Commercial paper |  |
Financial Assets |  |
Marketable investments | 31,445 | 39,756
Level 2 | Certificate of Deposit |  |
Financial Assets |  |
Marketable investments | 4,636 | 6,401
Level 2 | U.S. treasury |  |
Financial Assets |  |
Marketable investments | 0 | 0
Level 2 | U.S. states and municipalities |  |
Financial Assets |  |
Marketable investments | 891 | 2,915
Level 2 | Corporate bonds |  |
Financial Assets |  |
Marketable investments | 40,320 | 62,563
Level 2 | Non-marketable investments |  |
Financial Assets |  |
Marketable investments | 0 |
Level 2 | Commercial paper |  |
Financial Assets |  |
Cash equivalents | 30,555 |
Level 2 | Certificate of Deposit |  |
Financial Assets |  |
Cash equivalents | 4,901 |
Level 2 | Money market funds |  |
Financial Assets |  |
Cash equivalents | 0 | 0
Level 2 | U.S. treasury |  |
Financial Assets |  |
Cash equivalents | 0 |
Level 3 |  |
Financial Assets |  |
Assets, Fair Value Disclosure | 10,000 | 0
Level 3 | Commercial paper |  |
Financial Assets |  |
Marketable investments | 0 | 0
Level 3 | Certificate of Deposit |  |
Financial Assets |  |
Marketable investments | 0 | 0
Level 3 | U.S. treasury |  |
Financial Assets |  |
Marketable investments | 0 | 0
Level 3 | U.S. states and municipalities |  |
Financial Assets |  |
Marketable investments | 0 | 0
Level 3 | Corporate bonds |  |
Financial Assets |  |
Marketable investments | 0 | 0
Level 3 | Non-marketable investments |  |
Financial Assets |  |
Marketable investments | 10,000 |
Level 3 | Commercial paper |  |
Financial Assets |  |
Cash equivalents | 0 |
Level 3 | Certificate of Deposit |  |
Financial Assets |  |
Cash equivalents | 0 |
Level 3 | Money market funds |  |
Financial Assets |  |
Cash equivalents | 0 | $ 0
Level 3 | U.S. treasury |  |
Financial Assets |  |
Cash equivalents | $ 0 |

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