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Marketable Securities
12 Months Ended
Dec. 31, 2025
Marketable Securities  
Marketable Securities

(5) Marketable Securities

The following is a summary of marketable debt securities, classified as available-for-sale:

  ​ ​ ​

  ​ ​ ​

Gross

  ​ ​ ​

Gross

  ​ ​ ​

Amortized

Unrealized

Unrealized

Fair

Cost

Gains

Losses

Value

(In thousands)

December 31, 2025

Marketable securities

U.S. government and municipal obligations

Maturing in one year or less

$

151,270

$

479

$

$

151,749

Maturing after one year through three years

42,358

127

42,485

Total U.S. government and municipal obligations

$

193,628

$

606

$

$

194,234

Corporate debt securities

Maturing in one year or less

$

257,064

$

373

$

$

257,437

Maturing after one year through three years

37,980

55

(4)

38,031

Total corporate debt securities

$

295,044

$

428

$

(4)

$

295,468

Total marketable securities

$

488,672

$

1,034

$

(4)

$

489,702

December 31, 2024

Marketable securities

U.S. government and municipal obligations

Maturing in one year or less

$

185,388

$

467

$

$

185,855

Maturing after one year through three years

102,331

316

(144)

102,503

Total U.S. government and municipal obligations

$

287,719

$

783

$

(144)

$

288,358

Corporate debt securities

Maturing in one year or less

$

336,350

$

350

$

(54)

$

336,646

Maturing after one year through three years

72,139

36

(254)

71,921

Total corporate debt securities

$

408,489

$

386

$

(308)

$

408,567

Total marketable securities

$

696,208

$

1,169

$

(452)

$

696,925

The Company holds investment grade marketable securities. Unrealized losses are generally attributable to changes in interest rates. The aggregate fair value of marketable securities held by the Company in an unrealized loss position as of December 31, 2025 and December 31, 2024 was $19.4 million and $142.5 million, respectively. The Company has the intent and ability to hold its marketable securities until recovery and has determined that there has been no material change to the Company’s credit risk. As a result, the Company determined it did not hold any investments with a credit loss at December 31, 2025 and December 31, 2024.

Marketable securities include $4.4 million and $6.1 million in accrued interest at December 31, 2025 and 2024, respectively.