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Financial Instruments
3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Financial Instruments Financial Instruments
Marketable securities classified as available-for-sale on March 31, 2022 and December 31, 2021, consisted of the following (in thousands):
March 31, 2022
MaturityAmortized CostUnrealized GainsUnrealized LossesFair Value
U.S. Treasury billsLess than one year$318,419 $— $(373)$318,047 

December 31, 2021
MaturityAmortized CostUnrealized GainsUnrealized LossesFair Value
U.S. Treasury billsLess than one year$416,559 $— $(50)$416,509 

As of March 31, 2022 and December 31, 2021, all marketable securities had contractual maturities less than one year. Marketable securities with maturities greater than one year are classified as current because management considers all marketable securities to be available for current operations. The Company does not intend to sell its marketable securities and it is not likely that the Company will be required to sell these securities before recovery of their amortized cost bases.