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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
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.