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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
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:
 September 30, 2021December 31, 2020
  Fair value measurement category Fair value measurement category
(In thousands)TotalLevel 1Level 2Level 3TotalLevel 1Level 2Level 3
Assets:
Money market funds$6,146 $6,146 $— $— $3,698 $3,698 $— $— 
Commercial paper13,242 — 13,242 — 8,994 — 8,994 — 
Corporate notes48,156 — 48,156 — 35,911 — 35,911 — 
U.S. government securities1,500 — 1,500 — 12,842 — 12,842 — 
U.S. government agency bonds1,075 — 1,075 — 5,001 — 5,001 — 
U.S. asset-backed securities— — — — 3,538 — 3,538 — 
$70,119 $6,146 $63,973 $— $69,984 $3,698 $66,286 $—