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FINANCIAL INSTRUMENTS (Tables)
 3 Months Ended
Mar. 31, 2022
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:
March 31, 2022
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$441,957 $— $— $441,957 $441,957 $— $— 
Level 2:
Money market instruments160,485 — — 160,485 160,485 — — 
Corporate debt securities585,315 62 (9,815)575,562 — 240,777 334,785 
U.S. government agency securities237,962 47 (2,059)235,950 — 155,716 80,234 
Commercial paper50,518 — (10)50,508 2,998 47,510 — 
Asset-backed securities51,822 1 (414)51,409 — 3,785 47,624 
Foreign and other3,080 136 (22)3,194 — 3,010 184 
Subtotal1,089,182 246 (12,320)1,077,108 163,483 450,798 462,827 
Total$1,531,139 $246 $(12,320)$1,519,065 $605,440 $450,798 $462,827 
December 31, 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$301,177 $— $— $301,177 $301,177 $— $— 
Level 2:
Money market instruments285,099 — — 285,099 285,099 — — 
Corporate debt securities584,000 386 (2,086)582,300 — 200,304 381,996 
U.S. government agency securities224,774 182 (325)224,631 — 146,421 78,210 
Commercial paper68,384 — — 68,384 1,000 67,384 — 
Asset-backed securities56,936 10 (95)56,851 — 9,451 47,400 
Foreign and other3,097 141 (12)3,226 — 3,039 187 
Subtotal1,222,290 719 (2,518)1,220,491 286,099 426,599 507,793 
Total$1,523,467 $719 $(2,518)$1,521,668 $587,276 $426,599 $507,793 
(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.