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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2020
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 and liabilities 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, 2020 and as of December 31, 2019 are presented in the following tables: 

September 30, 2020
Level 1Level 2Level 3Fair Value
(in thousands)
Financial Assets:
Money market funds (1)$101,013 $— $— $101,013 
Commercial paper— 73,967 — 73,967 
Corporate bonds— 285,657 — 285,657 
U.S. treasury securities468,726 — — 468,726 
U.S. agency securities— 62,581 — 62,581 
Total financial assets$569,739 $422,205 $— $991,944 
December 31, 2019
Level 1Level 2Level 3Fair Value
(in thousands)
Financial Assets:
Money market funds (1)$122,900 $— $— $122,900 
Corporate bonds— 205,011 — 205,011 
U.S. treasury securities181,894 — — 181,894 
U.S. agency securities— 25,824 — 25,824 
Certificates of deposit— 1,000 — 1,000 
Total financial assets$304,794 $231,835 $— $536,629 
(1)Included within cash and cash equivalents on the Company’s condensed consolidated balance sheets