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FINANCIAL INSTRUMENTS (Tables)
 9 Months Ended
Sep. 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:
September 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$378,705 $— $— $378,705 $378,705 $— $— 
Level 2:
Money market instruments557,006 — — 557,006 557,006 — — 
Corporate debt securities435,954 4,558 (14)440,498 — 280,000 160,498 
U.S. government agency securities361,336 2,182 (1)363,517 79,964 199,559 83,994 
Asset-backed securities23,430 129 — 23,559 — 3,639 19,920 
Commercial paper6,800 — — 6,800 — 6,800 — 
Foreign and other549 161 — 710 — — 710 
Subtotal1,385,075 7,030 (15)1,392,090 636,970 489,998 265,122 
Total$1,763,780 $7,030 $(15)$1,770,795 $1,015,675 $489,998 $265,122 


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.