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Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 369,809 | $ 150,593
Gross Unrealized Gains |  |
Gross Unrealized Gains |  | 5
Gross Unrealized Losses |  |
Gross Unrealized Losses | (702) | (12)
Fair Value |  |
Fair Value | 369,107 | 150,586
U.S. government and municipal obligations |  |
Amortized Cost |  |
Maturing in one year or less | 80,674 | 40,328
Maturing after one year through three years | 51,319 |
Amortized Cost | 131,993 | 40,328
Gross Unrealized Gains |  |
Maturing in one year or less |  | 3
Gross Unrealized Gains |  | 3
Gross Unrealized Losses |  |
Maturing in one year or less | (133) | (2)
Maturing after one year through three years | (184) |
Gross Unrealized Losses | (317) | (2)
Fair Value |  |
Maturing in one year or less | 80,541 | 40,329
Maturing after one year through three years | 51,135 |
Fair Value | 131,676 | 40,329
Corporate debt securities |  |
Amortized Cost |  |
Maturing in one year or less | 170,034 | 110,265
Maturing after one year through three years | 67,782 |
Amortized Cost | 237,816 | 110,265
Gross Unrealized Gains |  |
Maturing in one year or less |  | 2
Gross Unrealized Gains |  | 2
Gross Unrealized Losses |  |
Maturing in one year or less | (28) | (10)
Maturing after one year through three years | (357) |
Gross Unrealized Losses | (385) | (10)
Fair Value |  |
Maturing in one year or less | 170,006 | 110,257
Maturing after one year through three years | 67,425 |
Fair Value | $ 237,431 | $ 110,257

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