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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Financial Assets and Liabilities Subject to Fair Value Measurements on Recurring Basis and Level of Inputs Used in Such Measurements by Major Security Type
Financial assets subject to fair value measurements on a recurring basis and the level of inputs used in such measurements by major security type as of September 30, 2023 and as of December 31, 2022 are presented in the following tables: 

September 30, 2023
Level 1Level 2Level 3Fair Value
(In thousands)
Financial Assets:
Money market funds (1)$50,937 $— $— $50,937 
Corporate bonds— 86,179 — 86,179 
U.S. treasury securities310,957 — — 310,957 
U.S. agency securities— 41,266 — 41,266 
Total financial assets$361,894 $127,445 $— $489,339 

December 31, 2022
Level 1Level 2Level 3Fair Value
(In thousands)
Financial Assets:
Money market funds (1)$10,679 $— $— $10,679 
Commercial paper— 4,954 — 4,954 
Corporate bonds— 153,256 — 153,256 
U.S. treasury securities318,022 — — 318,022 
U.S. agency securities— 39,416 — 39,416 
Total financial assets$328,701 $197,626 $— $526,327 
(1)Included within cash and cash equivalents on the Company’s condensed consolidated balance sheets