| Schedule of Marketable Securities |
Marketable securities at June 30, 2023 consisted of the following: | | | | | | | | | | | | | | | | | | | | | | | | | (In thousands) | Amortized
Cost | | Unrealized
Gains | | Unrealized
Losses | | Fair
Value | | Current: | | | | | | | | | | | | | | | | | U.S. Treasuries | $ | 52,030 | | | $ | 1 | | | $ | (476) | | | $ | 51,555 | | | Government securities | 276,272 | | | — | | | (3,458) | | | 272,814 | | | Corporate debt securities | 295,725 | | | 4 | | | (2,285) | | | 293,444 | | | Total Current | 624,027 | | | 5 | | | (6,219) | | | 617,813 | | | | | | | | | | | Non-current: | | | | | | | | | | | | | | | | | U.S. Treasuries | — | | | — | | | — | | | — | | | Government securities | 100,512 | | | — | | | (1,230) | | | 99,282 | | | Corporate debt securities | 146,501 | | | 10 | | | (1,436) | | | 145,075 | | | Total Non-current | 247,013 | | | 10 | | | (2,666) | | | 244,357 | | | Total marketable securities | $ | 871,040 | | | $ | 15 | | | $ | (8,885) | | | $ | 862,170 | |
Marketable securities at December 31, 2022 consisted of the following: | | | | | | | | | | | | | | | | | | | | | | | | | (In thousands) | Amortized
Cost | | Unrealized
Gains | | Unrealized
Losses | | Fair
Value | | Current: | | | | | | | | | | | | | | | | | U.S. Treasuries | $ | 68,175 | | | $ | 3 | | | $ | (811) | | | $ | 67,367 | | | Government securities | 220,901 | | | 8 | | | (5,289) | | | 215,620 | | | Corporate debt securities | 363,263 | | | 1 | | | (2,391) | | | 360,873 | | | Total Current | 652,339 | | | 12 | | | (8,491) | | | 643,860 | | | | | | | | | | | Non-current: | | | | | | | | | | | | | | | | | U.S. Treasuries | 17,418 | | | 4 | | | (193) | | | 17,229 | | | Government securities | 117,475 | | | 7 | | | (1,659) | | | 115,823 | | | Corporate debt securities | 183,037 | | | 76 | | | (2,291) | | | 180,822 | | | Total Non-current | 317,930 | | | 87 | | | (4,143) | | | 313,874 | | | Total marketable securities | $ | 970,269 | | | $ | 99 | | | $ | (12,634) | | | $ | 957,734 | |
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