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Fair Value Measurement - Summary of Major Security Type Assets That Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Available for Sale Securities [Line Items] |  |
Amortized Cost | $ 1,174,206 | $ 1,445,128
Unrealized Gain | 7 |
Unrealized Loss | (22,085) | (4,208)
Fair Value | 1,152,128 | 1,440,920
Level 1 | Money Market Funds |  |
Schedule of Available for Sale Securities [Line Items] |  |
Amortized Cost | 231,866 | 227,826
Fair Value | 231,866 | 227,826
Level 2 | Commercial Paper |  |
Schedule of Available for Sale Securities [Line Items] |  |
Amortized Cost | 107,198 | 233,400
Fair Value | 107,198 | 233,400
Level 2 | U.S. Government Securities |  |
Schedule of Available for Sale Securities [Line Items] |  |
Amortized Cost | 629,591 | 724,554
Unrealized Gain | 7 |
Unrealized Loss | (13,109) | (2,244)
Fair Value | 616,489 | 722,310
Level 2 | Corporate Notes and Bonds |  |
Schedule of Available for Sale Securities [Line Items] |  |
Amortized Cost | 205,551 | 259,348
Unrealized Loss | (8,976) | (1,964)
Fair Value | $ 196,575 | $ 257,384

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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