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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Securities, Available-for-sale [Abstract]  
Cash equivalents and marketable securities classified as available-for-sale Total cash, cash equivalents and marketable securities are summarized as follows:
As of December 31, 2021
(In thousands)Fair ValueAmortized CostGross Unrealized GainsGross Unrealized LossesWeighted Rate of Return
Money market funds$7,402 $7,402 $— $— 0.02 %
U.S. Government bonds and notes102,812 103,113 — (301)0.29 %
Corporate notes, bonds and commercial paper287,905 288,667 8 (770)0.22 %
Total cash equivalents and marketable securities
398,119 399,182 8 (1,071)
Cash87,490 87,490 — — 
Total cash, cash equivalents and marketable securities
$485,609 $486,672 $8 $(1,071)
As of December 31, 2020
(In thousands)Fair ValueAmortized CostGross Unrealized GainsGross Unrealized LossesWeighted Rate of Return
Money market funds$18,162 $18,162 $— $— 0.01 %
U.S. Government bonds and notes169,633 169,670 3 (40)0.12 %
Corporate notes, bonds and commercial paper253,391 253,412 61 (82)0.20 %
Total cash equivalents and marketable securities
441,186441,24464 (122)
Cash61,463 61,463 — — 
Total cash, cash equivalents and marketable securities
$502,649 $502,707 $64 $(122)
Available-for-sale securities reported at fair value Available-for-sale securities are reported at fair value on the balance sheets and classified along with cash as follows:
As of December 31,
(In thousands)20212020
Cash equivalents$20,401 $67,504 
Short-term marketable securities377,718 373,682 
Total cash equivalents and marketable securities
398,119441,186
Cash87,490 61,463 
Total cash, cash equivalents and marketable securities
$485,609 $502,649 
Estimated fair value of cash equivalents and marketable securities classified by date of contractual maturity and the length of time that the securities have been in a continuous unrealized loss position
The estimated fair value and gross unrealized losses of cash equivalents and marketable securities classified by the length of time that the securities have been in a continuous unrealized loss position at December 31, 2021 and 2020 are as follows:
Fair ValueGross Unrealized Loss
(In thousands)December 31,
2021		December 31,
2020		December 31,
2021		December 31,
2020
Less than 12 months
U.S. Government bonds and notes$82,822 $70,548 $(301)$(40)
Corporate notes, bonds and commercial paper255,783 181,349 (770)(82)
Total cash equivalents and marketable securities in a continuous unrealized loss position$338,605 $251,897 $(1,071)$(122)
Contractual maturities of cash equivalents (excluding money market funds which have no maturity) and marketable securities
The contractual maturities of cash equivalents (excluding money market funds which have no maturity) and marketable securities are summarized as follows:
(In thousands)December 31,
2021
Due less than one year$222,641 
Due from one year through three years168,076 
Total$390,717