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FINANCIAL INSTRUMENTS (Tables)
 6 Months Ended
Jun. 30, 2021
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, 2021
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$348,830 $— $— $348,830 $348,830 $— $— 
Level 2:
Money market instruments249,556 — — 249,556 249,556 — — 
Corporate debt securities426,514 1,639 (110)428,043 — 168,393 259,650 
U.S. government agency securities253,923 685 (30)254,578 27,999 166,491 60,088 
Commercial paper153,334 3 — 153,337 15,148 138,189 — 
Asset-backed securities38,553 42 (12)38,583 — 8,282 30,301 
Foreign and other550 157 — 707 — 509 198 
Subtotal1,122,430 2,526 (152)1,124,804 292,703 481,864 350,237 
Total$1,471,260 $2,526 $(152)$1,473,634 $641,533 $481,864 $350,237 
December 31, 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$370,325 $— $— $370,325 $370,325 $— $— 
Level 2:
Money market instruments264,833 — — 264,833 264,833 — — 
Corporate debt securities413,137 3,261 (8)416,390 — 220,551 195,839 
U.S. government agency securities265,298 1,555 (1)266,852 14,000 192,488 60,364 
Asset-backed securities31,659 85 (2)31,742 — 3,189 28,553 
Foreign and other549 168 — 717 — — 717 
Subtotal975,476 5,069 (11)980,534 278,833 416,228 285,473 
Total$1,345,801 $5,069 $(11)$1,350,859 $649,158 $416,228 $285,473 
(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.