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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Summary of valuation of the Company's investments and financial instruments that are measured at fair value on a recurring basis The following table summarizes the valuation of the Company’s financial instruments that are measured at fair value on a recurring basis:
 June 30, 2020December 31, 2019
  Fair value measurement category Fair value measurement category
(In thousands)TotalLevel 1Level 2Level 3TotalLevel 1Level 2Level 3
Assets:
Money market funds$44,985  $44,985  $—  $—  $5,381  $5,381  $—  $—  
Commercial paper3,685  —  3,685  —  11,892  —  11,892  —  
Corporate notes8,895  —  8,895  —  18,380  —  18,380  —  
U.S. government securities7,843  —  7,843  —  11,295  —  11,295  —  
U.S. asset-backed securities4,663  —  4,663  —  10,509  —  10,509  —  
$70,071  $44,985  $25,086  $—  $57,457  $5,381  $52,076  $—