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MARKETABLE DEBT SECURITIES
 9 Months Ended
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
MARKETABLE DEBT SECURITIES MARKETABLE DEBT SECURITIES
We invest our excess cash balances in marketable debt securities and at each balance sheet date presented, we classify all of our investments in debt securities as available-for-sale and as current assets as they represent the investment of funds available for current operations. We did not record any impairment charges related to our marketable debt securities during the three or nine months ended September 30, 2022 or 2021.
The following tables summarize our marketable debt securities:
As of September 30, 2022
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
U.S. treasury securities$886,783 $27 $(6,316)$880,494 
Corporate notes169,358 — (2,974)166,384 
U.S. government-sponsored enterprise securities178,576 11 (3,382)175,205 
Commercial paper16,045 — — 16,045 
Total$1,250,762 $38 $(12,672)$1,238,128 
As of December 31, 2021
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
U.S. treasury securities$1,086,232 $6 $(662)$1,085,576 
Corporate notes253,926 1 (688)253,239 
U.S. government-sponsored enterprise securities178,027 2 (288)177,741 
Commercial paper78,543 — — 78,543 
Certificates of deposit7,501 — — 7,501 
Municipal securities1,016 — (1)1,015 
Total$1,605,245 $9 $(1,639)$1,603,615 
The fair values of our marketable debt securities by classification in the condensed consolidated balance sheets were as follows:
(In thousands)As of September 30, 2022As of December 31, 2021
Marketable debt securities$1,169,050 $1,548,617 
Cash and cash equivalents69,078 54,998 
Total$1,238,128 $1,603,615