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Fair Value Measurements
9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The Company measures and reports its cash equivalents, restricted cash, and investments at fair value.
Money market funds are measured at fair value on a recurring basis using quoted prices and are classified as Level 1. Investments are measured at fair value based on inputs other than quoted prices that are derived from observable market data and are classified as Level 2 inputs, except for investments in U.S. treasury securities which are classified as Level 1.
There were no Level 3 assets or liabilities as of September 30, 2023 and as of December 31, 2022.
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