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Marketable Securities | 12 Months Ended
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Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities Available-for-sale marketable securities as of December 31, 2016 and 2015 were as follows (in thousands):
| December 31, 2016
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury securities | $ | 4,826 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 4,825 |
Government-sponsored enterprises | 29,764 |  |  | 5 |  |  | (10 | ) |  | 29,759 |
Corporate debt securities | 166,376 |  |  | 51 |  |  | (127 | ) |  | 166,300 |
Total | $ | 200,966 |  |  | $ | 56 |  |  | $ | (138 | ) |  | $ | 200,884 |
| December 31, 2015
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury securities | $ | 9,354 |  |  | $ | 1 |  |  | $ | (6 | ) |  | $ | 9,349 |
Government-sponsored enterprises | 22,055 |  |  | 1 |  |  | (9 | ) |  | 22,047 |
Corporate debt securities | 111,473 |  |  | 42 |  |  | (34 | ) |  | 111,481 |
Total | $ | 142,882 |  |  | $ | 44 |  |  | $ | (49 | ) |  | $ | 142,877 |
The contractual maturities of the available-for-sale marketable securities as of December 31, 2016 were as follows (in thousands):
| Amortized Cost |  | Fair Value
Mature in one year or less | $ | 192,985 |  |  | $ | 192,898 |
Mature between one and five years | 7,981 |  |  | 7,986 |
Total | 200,966 |  |  | 200,884 |
All of the Company's available-for-sale securities held at December 31, 2015 had maturity dates of less than one year. All available-for-sale securities in an unrealized loss position as of December 31, 2016 and 2015 were in a loss position for less than twelve months. There were no unrealized losses at December 31, 2016 or 2015 that the Company determined to be other-than-temporary.

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