Fair Value Measurements
The following tables present information about the Company’s financial assets measured at fair value on a recurring basis and indicate the level of the fair value hierarchy utilized to determine such fair values (in thousands):
December 31, 2025
Aggregate estimated fair valueQuoted Prices in Active Markets for Identical Assets (Level 1)
Significant Other Observable Inputs (Level 2)
Significant Unobservable Inputs (Level 3)
Assets classified as cash equivalents:
Money market funds
$71,191 $71,191 $— $— 
United Kingdom Government Securities
301 — 301 — 
Corporate debt securities1,753 — 1,753 — 
$73,245 $71,191 $2,054 $ 
Assets classified as marketable securities: available-for-sale debt securities
Commercial paper
$52,589 $— $52,589 $— 
Corporate debt securities
58,299 — 58,299 — 
United Kingdom Government Securities
66,175 — 66,175 — 
United States Treasury Bills
19,515 19,515 — — 
$196,578 $19,515 $177,063 $ 
$269,823 $90,706 $179,117 $ 
December 31, 2024
Aggregate estimated fair valueQuoted Prices in Active Markets for Identical Assets (Level 1)
Significant Other Observable Inputs (Level 2)
Significant Unobservable Inputs (Level 3)
Assets classified as cash equivalents:
Money market funds
$113,447 $113,447 $— $— 
Commercial paper
14,301 — 14,301 — 
United Kingdom Government Securities84,255 — 84,255 — 
United States Treasury Bills
7,989 7,989 — — 
$219,992 $121,436 $98,556 $ 
Assets classified as marketable securities: available-for-sale debt securities
Commercial paper
$21,141 $— $21,141 $— 
Corporate debt securities
151,124 — 151,124 — 
United Kingdom Government Securities141,307 — 141,307 — 
United States Treasury Bills47,071 47,071 — — 
$360,643 $47,071 $313,572 $ 
$580,635 $168,507 $412,128 $ 
The Company estimates the fair value of available-for-sale debt securities using actual trade and indicative prices sourced from third-party providers on a daily basis to estimate the fair value. If observed market prices are not available (for example securities with short maturities and infrequent secondary market trades), the securities are priced using a valuation model maximizing observable inputs, including market interest rates.
As of December 31, 2025 and 2024, the Company did not have non-financial assets measured at fair value on a recurring basis. During the years ended December 31, 2025 and 2024, there were no transfers between levels.

Historical Timeline

Fiscal YearFiled
2025Mar 27, 2026Showing above
2024Mar 20, 2025
2023Mar 21, 2024

About Fair Value Disclosures

Fair value disclosures classify all assets and liabilities measured at fair value into a three-level hierarchy: Level 1 (quoted market prices), Level 2 (observable inputs like yield curves), and Level 3 (unobservable inputs requiring management estimates). The proportion of Level 3 assets directly reflects how much of the balance sheet depends on internal models rather than market evidence.

Key signals: a growing Level 3 balance relative to total fair-value assets increases valuation uncertainty and earnings volatility risk. Watch for transfers between levels — assets moving from Level 2 to Level 3 often signal deteriorating market liquidity. Unrealized gains and losses on Level 3 positions flow through earnings or other comprehensive income, so large swings deserve scrutiny. For financial institutions, examine the sensitivity disclosures that show how Level 3 valuations change under alternative assumptions. Compare the fair value of debt against its carrying amount to gauge hidden leverage.