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Fair Value Measurements
3 Months Ended
Mar. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements
3.         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 March 31, 2020 and as of December 31, 2019.
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 March 31, 2020 and as of December 31, 2019 are presented in the following tables: 

March 31, 2020
Level 1Level 2Level 3Fair Value
(in thousands)
Financial Assets:
Money market funds (1)$113,143  $—  $—  $113,143  
Commercial paper—  25,786  —  25,786  
Corporate bonds—  190,854  —  190,854  
U.S. treasury securities180,313  —  —  180,313  
U.S. agency securities—  29,192  —  29,192  
Total financial assets$293,456  $245,832  $—  $539,288  

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 balance sheets