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Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 709,121 | $ 388,070
Gross Unrealized Gains |  |
Gross Unrealized Gains | 220 | 777
Gross Unrealized Losses |  |
Gross Unrealized Losses | (572) | (63)
Fair Value |  |
Fair Value | 708,769 | 388,784
U.S. government and municipal obligations |  |
Amortized Cost |  |
Maturing in one year or less | 139,787 | 132,459
Maturing after one year through three years | 93,179 | 26,009
Amortized Cost | 232,966 | 158,468
Gross Unrealized Gains |  |
Maturing in one year or less | 14 | 143
Maturing after one year through three years |  | 77
Gross Unrealized Gains | 14 | 220
Gross Unrealized Losses |  |
Maturing in one year or less | (62) | (53)
Maturing after one year through three years | (275) |
Gross Unrealized Losses | (337) | (53)
Fair Value |  |
Maturing in one year or less | 139,739 | 132,549
Maturing after one year through three years | 92,904 | 26,086
Fair Value | 232,643 | 158,635
Corporate debt securities |  |
Amortized Cost |  |
Maturing in one year or less | 371,025 | 183,625
Maturing after one year through three years | 105,130 | 45,977
Amortized Cost | 476,155 | 229,602
Gross Unrealized Gains |  |
Maturing in one year or less | 141 | 300
Maturing after one year through three years | 65 | 257
Gross Unrealized Gains | 206 | 557
Gross Unrealized Losses |  |
Maturing in one year or less | (142) | (10)
Maturing after one year through three years | (93) |
Gross Unrealized Losses | (235) | (10)
Fair Value |  |
Maturing in one year or less | 371,024 | 183,915
Maturing after one year through three years | 105,102 | 46,234
Fair Value | $ 476,126 | $ 230,149

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