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Investments | 6 Months Ended
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Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract] |
Investments | Investments The amortized cost and estimated fair values of available-for-sale securities by balance sheet classification are as follows (dollar amounts in thousands):
As of June 30, 2016 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government securities funds | $ | 1,793 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 1,797 |
Total short-term investment securities | $ | 1,793 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 1,797 |
As of December 31, 2015 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government securities funds | $ | 1,794 |  |  | $ | — |  |  | $ | (22 | ) |  | $ | 1,772 |
Total short-term investment securities | $ | 1,794 |  |  | $ | — |  |  | $ | (22 | ) |  | $ | 1,772 |
There were no proceeds from the sales of available-for-sale securities during the six-month periods ended June 30, 2016 and 2015. The Company’s trading securities portfolio totaled $1.3 million at June 30, 2016, and $1.0 million at December 31, 2015, and generated gains of $35,000 and $21,000 for the six months ended June 30, 2016 and 2015, respectively. As of June 30, 2016 and December 31, 2015, the Company had an unrealized gain of $4,000 and an unrealized loss of $22,000, respectively, in its U.S. government securities funds. There were no securities that were in a loss position for more than 12 months.

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