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Fair Value Measurement - Summary of Financial Assets Subject to Fair Value Measurements on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value assets |  | $ 1,152,128 | $ 1,440,920
Money Market Funds |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value assets | [1] | 231,866 | 227,826
Commercial Paper |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value assets | [2] | 107,198 | 233,400
U.S. Government Securities |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value assets | [2] | 616,489 | 722,310
Corporate Notes and Bonds |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value assets | [2] | 196,575 | 257,384
Level 1 |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value assets |  | 231,866 | 227,826
Level 1 | Money Market Funds |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value assets | [1] | 231,866 | 227,826
Level 2 |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value assets |  | 920,262 | 1,213,094
Level 2 | Commercial Paper |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value assets | [2] | 107,198 | 233,400
Level 2 | U.S. Government Securities |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value assets | [2] | 616,489 | 722,310
Level 2 | Corporate Notes and Bonds |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total fair value assets | [2] | $ 196,575 | $ 257,384
[1] | Money market funds are included in cash and cash equivalents on the Condensed Consolidated Balance Sheets.
[2] | As of September 30, 2022 and December 31, 2021, marketable securities with original maturities of three months or less of $62.9 million and $86.1 million, respectively, are included in cash and cash equivalents on the Condensed Consolidated Balance Sheets.

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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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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