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Investments (Tables)
 9 Months Ended
Sep. 30, 2025
Investments  
Schedule of amortized cost, gross unrealized holding gains and losses included in accumulated other comprehensive income and the fair value of the fixed income securities The amortized cost, gross unrealized holding gains and losses included in accumulated other comprehensive income and the fair value of the fixed income securities as of September 30, 2025 and December 31, 2024 are presented in the tables below (in thousands):

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

September 30, 2025

​

​

    

Amortized

    

Unrealized

    

Unrealized

    

Fair

​

​

    

Cost

    

Gains

    

Losses

    

Value

​

Cash equivalents:

​

​

​

​

​

​

​

​

​

​

​

​

​

Money market funds

​

$

20,884

​

$

—

​

$

—

​

$

20,884

​

Cash equivalents

​

$

20,884

​

$

—

​

$

—

​

$

20,884

​

Available-for-sale investments-short-term:

​

​

  

​

​

  

​

​

  

​

​

  

​

U.S. treasury securities

​

$

420,331

​

$

519

​

$

—

​

$

420,850

​

Available-for-sale investments – short-term

​

$

420,331

​

$

519

​

$

—

​

$

420,850

​

Available-for-sale investments-long-term:

​

​

​

​

​

​

​

​

​

​

​

​

​

U.S. treasury securities

​

$

111,710

​

$

261

​

$

(16)

​

$

111,955

​

Available-for-sale investments – long-term

​

$

111,710

​

$

261

​

$

(16)

​

$

111,955

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

December 31, 2024

​

    

Amortized

    

Unrealized

    

Unrealized

    

Fair

​

    

Cost

    

Gains

    

Losses

    

Value

Cash equivalents:

​

​

​

​

​

​

​

​

​

​

​

​

Money market funds

​

$

29,806

​

$

—

​

$

—

​

$

29,806

U.S. treasury security

​

​

24,835

​

​

—

​

​

—

​

​

24,835

Cash equivalents

​

$

54,641

​

$

—

​

$

—

​

$

54,641

Available-for-sale investments-short-term:

​

​

  

​

​

  

​

​

  

​

​

  

U.S. treasury securities

​

$

124,352

​

$

69

​

$

(1)

​

$

124,420

Available-for-sale investments – short-term

​

$

124,352

​

$

69

​

$

(1)

​

$

124,420

Available-for-sale investments-long-term:

​

​

​

​

​

​

​

​

​

​

​

​

U.S. treasury security

​

$

25,059

​

$

9

​

$

—

​

$

25,068

Available-for-sale investments – long-term

​

$

25,059

​

$

9

​

$

—

​

$

25,068