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Investments (Tables)
 12 Months Ended
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Summary of Available-for-Sale Investments by Security type

Available-for-sale investments by security type were as follows (in thousands):

 

Estimated
Fair Value

 

 

Gross
Unrealized
Gains

 

 

Gross
Unrealized
Losses

 

 

Amortized
Cost

 

At December 31, 2024:

 

 

 

 

 

 

 

 

 

 

 

 

U.S. Treasuries - Cash equivalents

 

$

329,457

 

 

$

84

 

 

$

—

 

 

$

329,373

 

Total

 

$

329,457

 

 

$

84

 

 

$

—

 

 

$

329,373

 

At December 31, 2023:

 

 

 

 

 

 

 

 

 

 

 

 

U.S. Treasuries - Cash equivalents

 

$

94,523

 

 

$

18

 

 

$

—

 

 

$

94,505

 

Total

 

$

94,523

 

 

$

18

 

 

$

—

 

 

$

94,505

 
Estimated Fair Values of Available for Sale Securities

The estimated fair values of available-for-sale securities at December 31, 2024, by contractual maturity, are summarized as follows (in thousands):

 

2024

 

Due in one year or less

 

$

329,457

 
Summary Of Net Gains And Losses On Equity Securities

 

For the Years Ended December 31,

 

 

2024

 

 

2023

 

 

2022

 

Equity securities:

 

 

 

 

 

 

 

 

 

Net gains (losses) recognized during the period on
   equity securities

 

$

5,075

 

 

$

3,024

 

 

$

—

 

Unrealized net gains (losses) recognized during the
   period on equity securities still held at the reporting
   date

 

$

5,075

 

 

$

3,024

 

 

$

—