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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2023
Fair Value Disclosures [Abstract]  
Schedule of financial assets measured at fair value on a recurring basis
The following tables provide the financial assets measured at fair value on a recurring basis:
Amortized
Cost or
Carrying
Value
Gross
Unrealized
Gains
Gross
Unrealized
Losses Less Than 12 Months
Gross
Unrealized
Losses More
Than
12 Months
Fair Value Hierarchy as of
March 31, 2023
Aggregate
Fair Value
Level 1Level 2Level 3
Financial Assets:(In thousands)
Cash and cash equivalents:
Money market funds$289,997 $— $— $— $289,997 $— $— $289,997 
Total included in cash
    and cash equivalents
289,997 — — — 289,997 — — 289,997 
Marketable securities:
U.S. Treasury securities416,493 — (650)(7,747)408,096 — — 408,096 
Non-U.S. government
   securities
149,510 — (22)(4,543)144,945 — — 144,945 
Corporate debt securities and
   commercial paper
2,815,621 1,372 (6,169)(53,382)5,000 2,752,442 — 2,757,442 
Total marketable
   securities
3,381,624 1,372 (6,841)(65,672)558,041 2,752,442 — 3,310,483 
Total financial assets$3,671,621 $1,372 $(6,841)$(65,672)$848,038 $2,752,442 $— $3,600,480 
Amortized
Cost or
Carrying
Value
Gross
Unrealized
Gains
Gross
Unrealized
Losses Less Than 12 Months
Gross
Unrealized
Losses More
Than
12 Months
Fair Value Hierarchy as of
December 31, 2022
Aggregate
Fair Value
Level 1Level 2Level  3
Financial Assets:(In thousands)
Cash and cash equivalents:
Money market funds $46,610 $— $— $— $46,610 $— $— $46,610 
Reverse repurchase
   agreements
200,000 — — — — 200,000 — 200,000 
Commercial paper2,249 — — — 2,249 2,249 
Total included in cash
   and cash equivalents
248,859 — — — 46,610 202,249 — 248,859 
Marketable securities:
U.S. Treasury securities481,463 — (1,269)(11,347)468,847 — — 468,847 
Non-U.S. government
   securities
149,901 — (33)(6,304)143,564 — — 143,564 
Corporate debt securities and
   commercial paper
2,973,844 307 (12,202)(71,043)5,000 2,885,906 — 2,890,906 
Total marketable
   securities
3,605,208 307 (13,504)(88,694)617,411 2,885,906 — 3,503,317 
Total financial assets$3,854,067 $307 $(13,504)$(88,694)$664,021 $3,088,155 $— $3,752,176 
Schedule of contractual maturities of marketable securities
The following table summarizes the contractual maturities of marketable securities:
As of March 31, 2023As of December 31, 2022
Amortized
Cost
Aggregate
Fair Value
Amortized
Cost
Aggregate
Fair Value
Financial Assets:(In thousands)
Less than one year$2,155,152 $2,116,532 $1,943,836 $1,909,218 
One to three years1,226,472 1,193,951 1,661,372 1,594,099 
Total$3,381,624 $3,310,483 $3,605,208 $3,503,317