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Investments and Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2016
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Schedule of Investments | The following table is a summary of the Company’s investments:
|  | March 31, 2016 |  |  | December 31, 2015 |
|  | Held-to- Maturity |  |  | Held-to- Maturity |
Federal agency debt instruments |  | $ | 22,581 |  |  | $ | 23,689 |
Schedule of Unrealized Gains, Losses and Fair Value of Investments | The following table summarizes unrealized gains, losses and fair value of investments:
|  | March 31, 2016 |  |  | December 31, 2015 |
|  | Held-to- Maturity |  |  | Held-to- Maturity |
Cost/amortized cost |  | $ | 22,581 |  |  | $ | 23,689 |
Gross unrealized gains |  |  | 150 |  |  |  | 82 |
Gross unrealized losses |  |  | (193 | ) |  |  | (609 | )
Fair value |  | $ | 22,538 |  |  | $ | 23,162 |
Schedule of Maturity Profile of Investments | The following table sets forth the maturity profile of investments; however, these investments may be called prior to the maturity date:
|  | March 31, 2016 |  |  | December 31, 2015 |
|  | Held-to- Maturity |  |  | Held-to- Maturity |
Due within one year |  | $ | — |  |  | $ | — |
Due one year through five years |  |  | 8,368 |  |  |  | 8,369 |
Due five years through ten years |  |  | 2,836 |  |  |  | 3,127 |
Due over ten years |  |  | 11,377 |  |  |  | 12,193 |
Total |  | $ | 22,581 |  |  | $ | 23,689 |

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