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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2019
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, 2019
Quoted Prices in Active Markets for Identical AssetsSignificant Other Observable InputsSignificant Unobservable Inputs
TotalLevel 1Level 2Level 3
Assets:
Money market funds$67,321  $67,321  $—  $—  
Government-sponsored enterprises11,695  —  11,695  —  
Corporate debt securities85,564  —  85,564  —  
Corporate equity securities11,547  11,547  —  —  
Total assets measured at fair value(a)
$176,127  $78,868  $97,259  $—  
Fair Value Measurements at December 31, 2018
Quoted Prices in Active Markets for Identical AssetsSignificant Other Observable InputsSignificant Unobservable Inputs
TotalLevel 1Level 2Level 3
Assets:
Money market funds$46,257  $46,257  $—  $—  
U.S. Treasury securities12,488  —  12,488  —  
Corporate debt securities100,214  —  100,214  —  
Common stock warrants1,890  —  —  1,890  
Total assets measured at fair value(b)
$160,849  $46,257  $112,702  $1,890  
(a) Total assets measured at fair value at September 30, 2019 includes approximately $78.3 million reported in cash and cash equivalents on the consolidated balance sheet.
(b) Total assets measured at fair value at December 31, 2018 includes approximately $146.2 million reported in cash and cash equivalents on the balance sheet and $1.9 million reported in other assets on the consolidated balance sheet.