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Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 53,128 | $ 69,725
Gross Unrealized Gains |  |
Gross Unrealized Gains | 26 |
Gross Unrealized Losses |  |
Gross Unrealized Losses | (3) | (13)
Fair Value |  |
Fair Value | 53,151 | 69,712
U.S. government and municipal obligations |  |
Amortized Cost |  |
Maturing in one year or less | 18,509 | 27,355
Amortized Cost | 18,509 | 27,355
Gross Unrealized Gains |  |
Maturing in one year or less | 13 |
Gross Unrealized Gains | 13 |
Gross Unrealized Losses |  |
Maturing in one year or less |  | (4)
Gross Unrealized Losses |  | (4)
Fair Value |  |
Maturing in one year or less | 18,522 | 27,351
Fair Value | 18,522 | 27,351
Corporate debt securities |  |
Amortized Cost |  |
Maturing in one year or less | 34,619 | 42,370
Amortized Cost | 34,619 | 42,370
Gross Unrealized Gains |  |
Maturing in one year or less | 13 |
Gross Unrealized Gains | 13 |
Gross Unrealized Losses |  |
Maturing in one year or less | (3) | (9)
Gross Unrealized Losses | (3) | (9)
Fair Value |  |
Maturing in one year or less | 34,629 | 42,361
Fair Value | $ 34,629 | $ 42,361

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