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Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring basis - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Financial assets |  |
Total financial assets | $ 623,504 | $ 786,641
Level 1 |  |
Financial assets |  |
Total financial assets | 113,486 | 103,283
Level 2 |  |
Financial assets |  |
Total financial assets | 510,018 | 683,358
Money Market Funds |  |
Financial assets |  |
Total financial assets | 113,486 | 103,283
Money Market Funds | Level 1 |  |
Financial assets |  |
Total financial assets | 113,486 | 103,283
U.S. Government Debt Securities |  |
Financial assets |  |
Total financial assets | 482,044 | 671,777
U.S. Government Debt Securities | Level 2 |  |
Financial assets |  |
Total financial assets | 482,044 | 671,777
Corporate Bonds |  |
Financial assets |  |
Total financial assets | 27,974 | 11,581
Corporate Bonds | Level 2 |  |
Financial assets |  |
Total financial assets | $ 27,974 | $ 11,581

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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