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Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized Cost |  |
Amortized cost | $ 99,171 | $ 147,370
Gross Unrealized Gains |  |
Gross Unrealized Gains | 4 | 13
Gross Unrealized Losses |  |
Gross Unrealized Losses | (36) | (68)
Fair Value |  |
Fair Value | 99,139 | 147,315
Other-than-temporarily impairment | 0 |
Accrued interest | 300 | 600
U.S. government and municipal obligations |  |
Amortized Cost |  |
Maturing in one year or less | 26,164 | 52,754
Maturing after one year through three years |  | 296
Amortized cost | 26,164 | 53,050
Gross Unrealized Gains |  |
Maturing in one year or less | 3 | 5
Maturing after one year through three years |  | 8
Gross Unrealized Gains | 3 | 13
Gross Unrealized Losses |  |
Maturing in one year or less | (9) | (12)
Gross Unrealized Losses | (9) | (12)
Fair Value |  |
Maturing in one year or less | 26,158 | 52,747
Maturing after one year through three years |  | 304
Fair Value | 26,158 | 53,051
Corporate debt securities |  |
Amortized Cost |  |
Maturing in one year or less | 73,007 | 94,320
Amortized cost | 73,007 | 94,320
Gross Unrealized Gains |  |
Maturing in one year or less | 1 |
Gross Unrealized Gains | 1 |
Gross Unrealized Losses |  |
Maturing in one year or less | (27) | (56)
Gross Unrealized Losses | (27) | (56)
Fair Value |  |
Maturing in one year or less | 72,981 | 94,264
Fair Value | $ 72,981 | $ 94,264

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