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Fair Value Measurements - Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial Assets |  |
Marketable securities | $ 511,774 | $ 238,183
U.S. Treasuries |  |
Financial Assets |  |
Marketable securities | 180,373 | 71,368
Commercial paper |  |
Financial Assets |  |
Marketable securities | 41,904 |
Corporate equity securities |  |
Financial Assets |  |
Equity securities |  | 3,667
Corporate notes/bonds |  |
Financial Assets |  |
Marketable securities | 42,170 |
Money market funds |  |
Financial Assets |  |
Marketable securities | 139,682 | 230,201
Recurring |  |
Financial Assets |  |
Total financial assets | 515,651 | 462,426
Recurring | U.S. Treasuries |  |
Financial Assets |  |
Cash and cash equivalents |  | 7,982
Marketable securities | 180,373 | 63,386
Recurring | Government agency securities |  |
Financial Assets |  |
Marketable securities | 107,645 | 155,571
Recurring | Commercial paper |  |
Financial Assets |  |
Marketable securities | 41,904 |
Recurring | Corporate equity securities |  |
Financial Assets |  |
Restricted cash |  | 3,667
Recurring | Corporate notes/bonds |  |
Financial Assets |  |
Marketable securities | 42,170 |
Recurring | Money market funds |  |
Financial Assets |  |
Cash and cash equivalents | 139,682 | 230,201
Restricted cash | 3,877 | 1,619
Recurring | Level 1 |  |
Financial Assets |  |
Total financial assets | 323,932 | 458,759
Recurring | Level 1 | U.S. Treasuries |  |
Financial Assets |  |
Cash and cash equivalents |  | 7,982
Marketable securities | 180,373 | 63,386
Recurring | Level 1 | Government agency securities |  |
Financial Assets |  |
Marketable securities |  | 155,571
Recurring | Level 1 | Money market funds |  |
Financial Assets |  |
Cash and cash equivalents | 139,682 | 230,201
Restricted cash | 3,877 | 1,619
Recurring | Level 2 |  |
Financial Assets |  |
Total financial assets | 191,719 | 3,667
Recurring | Level 2 | Government agency securities |  |
Financial Assets |  |
Marketable securities | 107,645 |
Recurring | Level 2 | Commercial paper |  |
Financial Assets |  |
Marketable securities | 41,904 |
Recurring | Level 2 | Corporate equity securities |  |
Financial Assets |  |
Restricted cash |  | $ 3,667
Recurring | Level 2 | Corporate notes/bonds |  |
Financial Assets |  |
Marketable securities | $ 42,170 |

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