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Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost |  |
Amortized cost | $ 69,725 | $ 99,171
Gross Unrealized Gains |  |
Gross Unrealized Gains |  | 4
Gross Unrealized Losses |  |
Gross Unrealized Losses | (13) | (36)
Fair Value |  |
Fair Value | 69,712 | 99,139
U.S. government and municipal obligations |  |
Amortized Cost |  |
Maturing in one year or less | 27,355 | 26,164
Amortized cost | 27,355 | 26,164
Gross Unrealized Gains |  |
Maturing in one year or less |  | 3
Gross Unrealized Gains |  | 3
Gross Unrealized Losses |  |
Maturing in one year or less | (4) | (9)
Gross Unrealized Losses | (4) | (9)
Fair Value |  |
Maturing in one year or less | 27,351 | 26,158
Fair Value | 27,351 | 26,158
Corporate debt securities |  |
Amortized Cost |  |
Maturing in one year or less | 42,370 | 73,007
Amortized cost | 42,370 | 73,007
Gross Unrealized Gains |  |
Maturing in one year or less |  | 1
Gross Unrealized Gains |  | 1
Gross Unrealized Losses |  |
Maturing in one year or less | (9) | (27)
Gross Unrealized Losses | (9) | (27)
Fair Value |  |
Maturing in one year or less | 42,361 | 72,981
Fair Value | $ 42,361 | $ 72,981

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