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Investments
 6 Months Ended
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Investments
3.
Investments.

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

 

 

Estimated
Fair Value

 

 

Gross
Unrealized
Gains

 

 

Gross
Unrealized
Losses

 

 

Amortized
Cost

 

At June 30, 2024:

 

 

 

 

 

 

 

 

 

 

 

 

U.S. Treasuries - Cash equivalents

 

$

—

 

 

$

—

 

 

$

—

 

 

$

—

 

Total

 

$

—

 

 

$

—

 

 

$

—

 

 

$

—

 

At December 31, 2023:

 

 

 

 

 

 

 

 

 

 

 

 

U.S. Treasuries - Cash equivalents

 

$

94,523

 

 

$

18

 

 

$

—

 

 

$

94,505

 

Total

 

$

94,523

 

 

$

18

 

 

$

—

 

 

$

94,505

 

 

There were no realized gains or losses from available-for-sale securities during the three and six months ended June 30, 2024 and 2023.

 

 

For the Three Months Ended June 30,

 

 

For the Six Months Ended June 30,

 

 

2024

 

 

2023

 

 

2024

 

 

2023

 

Equity securities:

 

 

 

 

 

 

 

 

 

 

 

 

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

 

$

(2,262

)

 

$

—

 

 

$

(3,406

)

 

$

—

 

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

 

$

(2,262

)

 

$

—

 

 

$

(3,406

)

 

$

—

 

 

There were no sales of equity securities during the three and six months ended June 30, 2024 and 2023. Unrealized net gains (losses) recognized during the periods on equity securities are included in other income, net in the consolidated statements of operations.