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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Financial Assets Measured at Fair Value on a Recurring Basis
Financial assets measured at fair value on a recurring basis were as follows (in thousands):
Fair Value Measurements at September 30, 2020
Quoted Prices in Active Markets for Identical AssetsSignificant Other Observable InputsSignificant Unobservable Inputs
TotalLevel 1Level 2Level 3
Assets:
Money market funds$45,708 $45,708 $— $— 
U.S. Treasury securities60,005 — 60,005 — 
Government-sponsored enterprises14,007 — 14,007 — 
Corporate debt securities23,759 — 23,759 — 
Total assets measured at fair value(a)
$143,479 $45,708 $97,771 $— 

Fair Value Measurements at December 31, 2019
Quoted Prices in Active Markets for Identical AssetsSignificant Other Observable InputsSignificant Unobservable Inputs
TotalLevel 1Level 2Level 3
Assets:
Money market funds$46,149 $46,149 $— $— 
Government-sponsored enterprises13,222 — 13,222 — 
Corporate debt securities103,135 — 103,135 — 
Total assets measured at fair value(b)
$162,506 $46,149 $116,357 $— 
(a) Total assets measured at fair value at September 30, 2020 includes approximately $64.5 million reported in cash and cash equivalents on the consolidated balance sheet.
(b) Total assets measured at fair value at December 31, 2019 includes approximately $73.2 million reported in cash and cash equivalents on the consolidated balance sheet.