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Investments | 12 Months Ended
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Dec. 31, 2015
Investments [Abstract] |
Investments | 3. Investments Available-for-sale investments as of December 31, 2015 were as follows (in thousands):
|  | 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 |
All of the Company's available-for-sale investments held at December 31, 2015 had maturity dates of less than one year, and all available-for-sale investments in an unrealized loss position as of December 31, 2015 were in a loss position for less than twelve months.

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