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Fair Value Measurements
 12 Months Ended
Dec. 31, 2025
Fair Value Disclosures [Abstract]  
Fair Value Measurements
5. Fair Value Measurements
Fair value is defined as the price that would be received to sell an asset in an orderly transaction between market participants at the measurement date. To increase the comparability of fair value measures, the following hierarchy prioritizes the inputs to valuation methodologies used to measure fair value:
•Level 1: Quoted market prices in active markets for identical assets or liabilities
•Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data
•Level 3: Unobservable inputs reflecting the reporting entity’s own assumptions or external inputs from inactive markets
We classify our cash equivalents and marketable securities within Level 1 or Level 2 because we use quoted market prices or alternative pricing sources and models utilizing market observable inputs to determine their fair value. There were no transfers between levels during the periods presented.
The following tables set forth our financial assets that are measured at fair value on a recurring basis:
December 31, 2025
Fair value
hierarchy
level		Cost or
amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
value
(in thousands)
Cash equivalents:
Money market funds Level 1$825,323 $— $— $825,323 
U.S. treasury securities
Level 1
11,934 1 — 11,935 
Time depositsLevel 225,949 — — 25,949 
Marketable securities:
U.S. treasury securities Level 1450,474 1,035 (2)451,507 
U.S. agency bonds Level 2410,655 167 (134)410,688 
Corporate bonds Level 2306,321 820 (13)307,128 
Time depositsLevel 2140,000 — — 140,000 
Commercial paper Level 2213,767 152 — 213,919 
Total $2,384,423 $2,175 $(149)$2,386,449 

December 31, 2024
Fair value
hierarchy
level		Cost or
amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
value
(in thousands)
Cash equivalents:
Money market funds Level 1$497,461 $— $— $497,461 
U.S. treasury securitiesLevel 15,979 2 — 5,981 
Corporate bondsLevel 21,066 2 — 1,068 
Marketable securities:
U.S. treasury securities Level 1817,996 1,120 (396)818,720 
U.S. agency bondsLevel 2117,965 15 (62)117,918 
Corporate bondsLevel 2159,424 400 (86)159,738 
Commercial paperLevel 2182,264 99 (22)182,341 
Total $1,782,155 $1,638 $(566)$1,783,227 
Gross unrealized losses within accumulated other comprehensive income (loss) were immaterial as of December 31, 2025 and 2024. There were no impairment charges due to credit losses during the years ended December 31, 2025, 2024, and 2023.
As of December 31, 2025, the amortized cost of marketable securities with maturities less than one year was $883.9 million. The amortized cost of marketable securities with maturities between one and five years was $637.3 million.