| Schedule of Available-for-Sale Securities |
Amortized cost and estimated fair market value of investments classified as available-for-sale (excluding cash equivalents) at June 30, 2026, were as follows: | | | | | | | | | | | | | | | | | | | | | | | | | Amortized
Cost | | Gross Unrealized | | Estimated Fair
Market Value | | (In thousands) | | Gains | | Losses | | | Investments due in 3 months or less: | | | | | | | | | | | | | | | | | Corporate securities | $ | 10,656 | | | $ | 15 | | | $ | — | | | $ | 10,671 | | | Total | 10,656 | | | 15 | | | — | | | 10,671 | | | Investments due in 4-12 months: | | | | | | | | | Corporate securities | 87,107 | | | 371 | | | (2) | | | 87,476 | | | Total | 87,107 | | | 371 | | | (2) | | | 87,476 | | | Investments due in 12 months or greater: | | | | | | | | | Corporate securities | 94,075 | | | 106 | | | (327) | | | 93,854 | | | Total | 94,075 | | | 106 | | | (327) | | | 93,854 | | | Total investments | $ | 191,838 | | | $ | 492 | | | $ | (329) | | | $ | 192,001 | |
Amortized cost and estimated fair market value of investments classified as available-for-sale (excluding cash equivalents) at December 31, 2025, were as follows: | | | | | | | | | | | | | | | | | | | | | | | | | Amortized
Cost | | Gross Unrealized | | Estimated Fair
Market Value | | (In thousands) | | Gains | | Losses | | | Investments due in 3 months or less: | | | | | | | | | Commercial paper | $ | 1,498 | | | $ | — | | | $ | — | | | $ | 1,498 | | | Corporate securities | 8,152 | | | 8 | | | — | | | 8,160 | | | Total | 9,650 | | | 8 | | | — | | | 9,658 | | | Investments due in 4-12 months: | | | | | | | | | Corporate securities | 32,256 | | | 267 | | | — | | | 32,523 | | | Total | 32,256 | | | 267 | | | — | | | 32,523 | | | Investments due in 12 months or greater: | | | | | | | | | Corporate securities | 146,910 | | | 1,665 | | | (1) | | | 148,574 | | | Total | 146,910 | | | 1,665 | | | (1) | | | 148,574 | | | Total investments | $ | 188,816 | | | $ | 1,940 | | | $ | (1) | | | $ | 190,755 | |
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| Schedule of Available-for-sale Securities in an Unrealized Loss Position |
The following table summarizes investments classified as available-for-sale (excluding cash equivalents) in a continuous unrealized loss position for which an allowance for credit losses was not recorded at June 30, 2026: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Less Than 12 Months | | 12 Months or Longer | | Total | | (In thousands) | Estimated
Fair Market
Value | | Gross
Unrealized
Losses | | Estimated
Fair Market
Value | | Gross
Unrealized
Losses | | Estimated
Fair Market
Value | | Gross
Unrealized
Losses | | | | | | | | | | | | | | Corporate securities | $ | 52,066 | | | $ | (329) | | | $ | — | | | $ | — | | | $ | 52,066 | | | $ | (329) | | | Total investments | $ | 52,066 | | | $ | (329) | | | $ | — | | | $ | — | | | $ | 52,066 | | | $ | (329) | |
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