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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 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
June 30, 2023
Aggregate
Fair Value
Level 1Level 2Level 3
Financial Assets:(In thousands)
Cash and cash equivalents:
Money market funds$254,065 $— $— $— $254,065 $— $— $254,065 
Total included in cash
    and cash equivalents
254,065 — — — 254,065 — — 254,065 
Marketable securities:
Debt securities:
U.S. Treasury securities356,379 (536)(5,875)349,969 — — 349,969 
Non-U.S. government
   securities
166,324 — (96)(4,376)161,852 — — 161,852 
Corporate debt securities and
   commercial paper
2,536,521 56 (10,949)(40,762)— 2,484,866 — 2,484,866 
Total debt securities3,059,224 57 (11,581)(51,013)511,821 2,484,866 — 2,996,687 
Equity securities12,200 — — — 12,200 — — 12,200 
Total marketable securities3,071,424 57 (11,581)(51,013)524,021 2,484,866 — 3,008,887 
Total financial assets$3,325,489 $57 $(11,581)$(51,013)$778,086 $2,484,866 $— $3,262,952 
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 debt securities:
As of June 30, 2023As of December 31, 2022
Amortized
Cost
Aggregate
Fair Value
Amortized
Cost
Aggregate
Fair Value
Financial Assets:(In thousands)
Less than one year$2,061,380 $2,021,972 $1,943,836 $1,909,218 
One to three years997,844 974,715 1,661,372 1,594,099 
Total$3,059,224 $2,996,687 $3,605,208 $3,503,317