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FINANCIAL INSTRUMENTS (Tables)
 9 Months Ended
Sep. 30, 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:
September 30, 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$358,325 $— $— $358,325 $358,325 $— $— 
Level 2:
Money market instruments347,274 — — 347,274 347,274 — — 
Corporate debt securities522,723 10 (14,622)508,111 978 273,333 233,800 
U.S. government agency securities354,810 4 (4,377)350,437 54,938 209,469 86,030 
Commercial paper29,461 1 (22)29,440 — 29,440 — 
Asset-backed securities53,182 — (699)52,483 — 11 52,472 
Subtotal1,307,450 15 (19,720)1,287,745 403,190 512,253 372,302 
Total$1,665,775 $15 $(19,720)$1,646,070 $761,515 $512,253 $372,302 
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.