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Marketable Securities and Fair Value Measurements
 3 Months Ended
Mar. 31, 2022
Fair Value Disclosures [Abstract]  
Marketable Securities and Fair Value Measurements Marketable Securities and Fair Value Measurements
As of March 31, 2022, available for sale marketable securities by security type consisted of (in thousands):
Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
U.S. treasury notes (due within one year)$21,947 $— $(40)$21,907 
Commercial paper (due within one year)87,918 2 (168)87,752 
Corporate notes and bonds (due within one year)19,935 3 (93)19,845 
U.S. treasury notes (due after one year through two years)2,982 — (58)2,924 
Corporate notes and bonds (due after one year through two
   years)		79,505 1 (841)78,665 
Total$212,287 $6 $(1,200)$211,093 
As of December 31, 2021, available for sale marketable securities by security type consisted of (in thousands):
Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Commercial paper (due within one year)$36,246 $— $(3)$36,243 
Corporate notes and bonds (due within one year)16,917 — (7)16,910 
Total$53,163 $— $(10)$53,153 
The following tables present the Company’s fair value hierarchy for its assets and liabilities, which are measured at fair value on a recurring basis (in thousands):
Fair Value Measurements at March 31, 2022 Using:
Level 1Level 2Level 3Total
Assets:
Cash equivalents:
Money market funds$54,436 $— $— $54,436 
           U.S. treasury notes— 109,996 — 109,996 
           Commercial paper— 50,663 — 50,663 
Marketable securities:
U.S. treasury notes— 24,831 — 24,831 
Commercial paper— 87,752 — 87,752 
Corporate notes and bonds— 98,510 — 98,510 
Total$54,436 $371,752 $— $426,188 
Fair Value Measurements at December 31, 2021 Using:
Level 1Level 2Level 3Total
Assets:
Cash equivalents:
Money market funds$82,252 $— $— $82,252 
Commercial paper— 18,496 — 18,496 
Marketable securities:
Commercial paper— 36,243 — 36,243 
Corporate notes and bonds— 16,910 — 16,910 
Total$82,252 $71,649 $— $153,901 
During the three months ended March 31, 2022 and 2021, there were no transfers between Level 1, Level 2 and Level 3.