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Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2020
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 June 30, 2020
(In thousands)Fair Value
Amortized
 Cost
Gross
 Unrealized
 Gains
Gross
 Unrealized
 Losses
Weighted
 Rate of
 Return
Money market funds$50,414  $50,414  $—  $—  0.05 %
U.S. Government bonds and notes145,236  145,242  19  (25) 0.22 %
Corporate notes, bonds, commercial paper and other245,772  245,773  76  (77) 0.59 %
Total cash equivalents and marketable securities441,422  441,429  95  (102)  
Cash44,655  44,655  —  —   
Total cash, cash equivalents and marketable securities$486,077  $486,084  $95  $(102)  
 As of December 31, 2019
(In thousands)Fair Value
Amortized
 Cost
Gross
 Unrealized
 Gains
Gross
 Unrealized
 Losses
Weighted
 Rate of
 Return
Money market funds$10,065  $10,065  $—  $—  1.48 %
U.S. Government bonds and notes39,086  39,087  —  (1) 1.49 %
Corporate notes, bonds, commercial paper and other314,391  314,435  19  (63) 1.81 %
Total cash equivalents and marketable securities363,542  363,587  19  (64)  
Cash44,122  44,122  —  —   
Total cash, cash equivalents and marketable securities$407,664  $407,709  $19  $(64)  
Available-for-sale securities reported at fair value
Available-for-sale securities are reported at fair value on the balance sheets and classified as follows:
As of
(In thousands)June 30, 2020December 31, 2019
Cash equivalents$58,620  $58,054  
Short term marketable securities382,802  305,488  
Total cash equivalents and marketable securities441,422  363,542  
Cash44,655  44,122  
Total cash, cash equivalents and marketable securities$486,077  $407,664  
Estimated fair value of cash equivalents and marketable securities classified by 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 June 30, 2020 and December 31, 2019 are as follows:
 Fair ValueGross Unrealized Loss
(In thousands)June 30, 2020December 31, 2019June 30, 2020December 31, 2019
Less than 12 months:    
U.S. Government bonds and notes$134,488  $14,112  $(25) $(1) 
Corporate notes, bonds, commercial paper and other104,391  250,822  (77) (63) 
Total cash equivalents and marketable securities in a continuous unrealized loss position$238,879  $264,934  $(102) $(64) 
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)June 30, 2020
Due less than one year$378,807  
Due from one year through three years12,201  
Total$391,008