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FINANCIAL INSTRUMENTS (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Cash, Cash Equivalents and Available-for-Sale Securities by Significant Investment Category
The following tables show the Company’s cash, cash equivalents and available-for-sale securities by significant investment category for each period presented:
June 30, 2020
Amortized CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Aggregate Fair ValueCash and Cash Equivalents
Short-term
Marketable
Securities (1)
Long-term
Marketable
Securities (2)
Level 1:
Cash$289,755  $—  $—  $289,755  $289,755  $—  $—  
Level 2:
Money market instruments348,757  —  —  348,757  348,757  —  —  
Corporate debt securities542,518  6,110  (54) 548,574  48,728  311,690  188,156  
Commercial paper192,267  4  (1) 192,270  120,662  71,608  —  
U.S. government agency securities295,600  2,824  —  298,424  10,998  175,862  111,564  
Asset-backed securities24,769  180  (3) 24,946  —  2,312  22,634  
Foreign and other549  156  (1) 704  —  —  704  
Subtotal1,404,460  9,274  (59) 1,413,675  529,145  561,472  323,058  
Total$1,694,215  $9,274  $(59) $1,703,430  $818,900  $561,472  $323,058  


December 31, 2019
Amortized CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Aggregate Fair ValueCash and Cash Equivalents
Short-term
Marketable
Securities (1)
Long-term
Marketable
Securities (2)
Level 1:
Cash$259,347  $—  $—  $259,347  $259,347  $—  $—  
Level 2:
Money market instruments173,100  —  —  173,100  173,100  —  —  
Corporate debt securities518,523  3,575  (12) 522,086  —  233,294  288,792  
U.S. government agency securities209,633  993  (67) 210,559  4,999  83,067  122,493  
Foreign and other549  145  (1) 693  —  —  693  
Subtotal901,805  4,713  (80) 906,438  178,099  316,361  411,978  
Total$1,161,152  $4,713  $(80) $1,165,785  $437,446  $316,361  $411,978  
(1) The Company’s short-term marketable securities mature in one year or less.
(2) The Company’s long-term marketable securities mature between one and five years.