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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2021
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, 2021
TotalLevel 1Level 2
Assets:
Money market funds$15,334 $15,334 $— 
U.S. Treasury securities68,017 — 68,017 
Government-sponsored enterprises12,278 — 12,278 
Corporate debt securities47,570 — 47,570 
Total assets measured at fair value(a)
$143,199 $15,334 $127,865 
Fair Value Measurements at December 31, 2020
TotalLevel 1Level 2
Assets:
Money market funds$49,004 $49,004 $— 
U.S. Treasury securities60,623 — 60,623 
Corporate debt securities33,776 — 33,776 
Total assets measured at fair value(b)
$143,403 $49,004 $94,399 
(a) Total assets measured at fair value at September 30, 2021 includes approximately $34.8 million reported in cash and cash equivalents on the consolidated balance sheet.
(b) Total assets measured at fair value at December 31, 2020 includes approximately $52.0 million reported in cash and cash equivalents on the consolidated balance sheet.