v3.25.0.1
Fair Value Measurements
 12 Months Ended
Dec. 31, 2024
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
Assets and liabilities measured at fair value are classified into the following categories:
•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 observable market-based inputs to determine their fair value.
The following tables set forth our financial assets that are measured at fair value on a recurring basis, excluding publicly traded equity securities, as of December 31, 2024 and 2023:
December 31, 2024
Fair Value HierarchyCost or
Amortized Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Total Estimated
Fair Value
(in thousands)
Cash$348,251 $— $— $348,251 
Cash equivalents:
Money market fundsLevel 1694,323 — (30)694,293 
U.S. government securitiesLevel 13,991 — (1)3,990 
Total cash and cash equivalents1,046,565 — (31)1,046,534 
Marketable debt securities:
U.S. government securitiesLevel 12,186,192 4,984 (3,292)2,187,884 
Corporate debt securitiesLevel 2129,217 229 (5)129,441 
Total marketable debt securities2,315,409 5,213 (3,297)2,317,325 
Total$3,361,974 $5,213 $(3,328)$3,363,859 
December 31, 2023
Fair Value HierarchyCost or
Amortized Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Total Estimated
Fair Value
(in thousands)
Cash$584,990 $— $— $584,990 
Cash equivalents:
Money market fundsLevel 11,195,410 — — 1,195,410 
Total cash and cash equivalents1,780,400 — — 1,780,400 
Marketable debt securities:
U.S. government securitiesLevel 11,295,918 894 (3,919)1,292,893 
U.S. government agency securitiesLevel 1138,420 31 (188)138,263 
Corporate debt securitiesLevel 2234,336 577 (99)234,814 
Commercial paperLevel 265,380 — — 65,380 
Certificates of depositLevel 218,725 — — 18,725 
Total marketable debt securities1,752,779 1,502 (4,206)1,750,075 
Total$3,533,179 $1,502 $(4,206)$3,530,475 
Gross unrealized losses on marketable debt securities were not material as of December 31, 2024 and 2023. As of December 31, 2024 and 2023, we considered any decreases in fair value on our marketable debt securities to be driven by factors other than credit risk, including market risk. As of December 31, 2024, $1.1 billion of our total $2.3 billion in marketable debt securities have contractual maturities between one and five years. All other marketable debt securities have contractual maturities less than one year.
We hold investments in publicly traded companies with an aggregate carrying value of $12.4 million and $13.6 million as of December 31, 2024 and 2023, respectively, recorded as marketable securities. We classify these publicly traded equity securities within Level 1 because we use quoted market prices to determine their fair value. Gains and losses recognized during the periods presented, which are included within other income (expense), net on our consolidated statements of operations, were as follows:
Year Ended December 31,
202420232022
(in thousands)
Gains (losses) recognized on publicly traded equity securities sold during the period, net$— $11,046 $(22,095)
Unrealized gains (losses) on publicly traded equity securities still held at the reporting date, net(1,185)(17,731)(79,214)
Gains (losses) on publicly traded equity securities, net$(1,185)$(6,685)$(101,309)
We carry the Convertible Notes at face value less the unamortized debt issuance costs on our consolidated balance sheets and present the fair value for disclosure purposes only. As of December 31, 2024, the fair value of the 2025 Notes, the 2026 Notes, the 2027 Notes, the 2028 Notes, and the 2030 Notes was $35.5 million, $242.7 million, $998.5 million, $1,226.6 million, and $635.6 million, respectively. As of December 31, 2023, the fair value of the 2025 Notes, the 2026 Notes, the 2027 Notes, and the 2028 Notes was $300.9 million, $893.2 million, $921.5 million, and $1,181.7 million, respectively. The estimated fair value of the Convertible Notes, which are classified as Level 2 financial instruments, was determined based on the estimated or actual bid prices of the Convertible Notes in an over-the-counter market on the last business day of the period.
Schedule of Cash, Cash Equivalents, and Restricted Cash
The following table provides a reconciliation of cash, cash equivalents and restricted cash reported in our consolidated balance sheet to the total of the amounts in the consolidated statements of cash flows.
As of December 31,
202420232022
(in thousands)
Cash and cash equivalents$1,046,534 $1,780,400 $1,423,121 
Restricted cash, included in other assets3,700 2,062 655 
Total cash, cash equivalents, and restricted cash$1,050,234 $1,782,462 $1,423,776