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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, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Assets |  |
Total | $ 198,033 | $ 228,216
Commercial paper |  |
Financial Assets |  |
Marketable investments | 4,249 | 4,246
U.S. agency and government sponsored securities |  |
Financial Assets |  |
Marketable investments | 4,555 | 7,857
U.S. states and municipalities |  |
Financial Assets |  |
Marketable investments | 47,425 | 48,095
Corporate bonds |  |
Financial Assets |  |
Marketable investments | 130,748 | 134,964
Money market funds |  |
Financial Assets |  |
Cash equivalents | 11,056 | 33,054
Level 1 |  |
Financial Assets |  |
Total | 11,056 | 33,054
Level 1 | Commercial paper |  |
Financial Assets |  |
Marketable investments | 0 | 0
Level 1 | U.S. agency and government sponsored securities |  |
Financial Assets |  |
Marketable investments | 0 | 0
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 | Money market funds |  |
Financial Assets |  |
Cash equivalents | 11,056 | 33,054
Level 2 |  |
Financial Assets |  |
Total | 186,977 | 195,162
Level 2 | Commercial paper |  |
Financial Assets |  |
Marketable investments | 4,249 | 4,246
Level 2 | U.S. agency and government sponsored securities |  |
Financial Assets |  |
Marketable investments | 4,555 | 7,857
Level 2 | U.S. states and municipalities |  |
Financial Assets |  |
Marketable investments | 47,425 | 48,095
Level 2 | Corporate bonds |  |
Financial Assets |  |
Marketable investments | 130,748 | 134,964
Level 2 | Money market funds |  |
Financial Assets |  |
Cash equivalents | 0 | 0
Level 3 |  |
Financial Assets |  |
Total | 0 | 0
Level 3 | Commercial paper |  |
Financial Assets |  |
Marketable investments | 0 | 0
Level 3 | U.S. agency and government sponsored securities |  |
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 | Money market funds |  |
Financial Assets |  |
Cash equivalents | $ 0 | $ 0

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