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FINANCIAL INSTRUMENTS
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
FINANCIAL INSTRUMENTS FINANCIAL INSTRUMENTS
The following tables show the Company’s cash, cash equivalents and available-for-sale securities by significant investment category as of December 31, 2019 and 2018, respectively:
December 31, 2019
Amortized CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Aggregate Fair
Value		Cash 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 instruments
173,100  —  —  173,100  173,100  —  —  
Corporate debt securities
518,523  3,575  (12) 522,086  —  233,294  288,792  
U.S. government agency securities
209,633  993  (67) 210,559  4,999  83,067  122,493  
Foreign and other
549  145  (1) 693  —  —  693  
Subtotal
901,805  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  


December 31, 2018
Amortized CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Aggregate Fair
Value		Cash and Cash Equivalents
Short-term
Marketable Securities (1)
Long-term
Marketable Securities (2)
Level 1:
Cash
$228,809  $—  $—  $228,809  $228,809  $—  $—  
Level 2:
Money market instruments
205,736  —  —  205,736  205,736  —  —  
Corporate debt securities
564,852  214  (2,288) 562,778  2,000  376,545  184,233  
Commercial paper
77,702  —  —  77,702  21,964  55,738  —  
U.S. government agency securities
240,436  144  (697) 239,883  31,474  156,967  51,442  
Foreign and other
5,126  139  (1) 5,264  3,999  1,076  189  
Subtotal
1,093,852  497  (2,986) 1,091,363  265,173  590,326  235,864  
Total
$1,322,661  $497  $(2,986) $1,320,172  $493,982  $590,326  $235,864  
(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.
As of December 31, 2019, some of the Company’s investments were in an unrealized loss position. However, the Company has the ability and intent to hold all investments that have been in a continuous loss position until maturity or recovery, thus no other-than-temporary impairment was deemed to have occurred.
See Note 3 to these Consolidated Financial Statements for additional discussion regarding the Company’s fair value measurements.