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Marketable Securities | 6 Months Ended
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Jun. 30, 2017
Marketable Securities |
Marketable Securities | (4) Marketable Securities The following tables summarize our marketable securities, classified as available-for-sale:
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
|  | (In thousands) |
June 30, 2017 |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |
U.S. government and municipal obligations |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 18,253 |  | $ | 7 |  | $ | (6 | ) | $ | 18,254 |
Maturing after one year through three years |  | — |  | — |  | — |  | — |
Total U.S. government and municipal obligations |  | $ | 18,253 |  | $ | 7 |  | $ | (6 | ) | $ | 18,254 |
Corporate debt securities |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 69,588 |  | $ | 2 |  | $ | (22 | ) | $ | 69,568 |
Maturing after one year through three years |  | — |  | — |  | — |  | — |
Total corporate debt securities |  | $ | 69,588 |  | $ | 2 |  | $ | (22 | ) | $ | 69,568 |
Total marketable securities |  | $ | 87,841 |  | $ | 9 |  | $ | (28 | ) | $ | 87,822 |
December 31, 2016 |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |
U.S. government and municipal obligations |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 52,754 |  | $ | 5 |  | $ | (12 | ) | $ | 52,747 |
Maturing after one year through three years |  | 296 |  | 8 |  | — |  | 304 |
Total U.S. government and municipal obligations |  | $ | 53,050 |  | $ | 13 |  | $ | (12 | ) | $ | 53,051 |
Corporate debt securities |  |  |  |  |  |  |  |  |
Maturing in one year or less |  | $ | 94,320 |  | $ | — |  | $ | (56 | ) | $ | 94,264 |
Maturing after one year through three years |  | — |  | — |  | — |  | — |
Total corporate debt securities |  | $ | 94,320 |  | $ | — |  | $ | (56 | ) | $ | 94,264 |
Total marketable securities |  | $ | 147,370 |  | $ | 13 |  | $ | (68 | ) | $ | 147,315 |
The marketable securities held by the Company were high investment grade and there were no marketable securities that the Company considered to be other-than-temporarily impaired as of June 30, 2017. Marketable securities include $0.4 million and $0.6 million in accrued interest at June 30, 2017 and December 31, 2016, respectively.

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