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Short-term Investments | 12 Months Ended
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Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Short-term Investments | Short-term Investments The following table summarizes the held-to-maturity securities held at December 31, 2016:
|  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
As of December 31, 2016 |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 22,930 |  |  | 31 |  |  | 62 |  |  | $ | 22,899 |
Total short-term investments |  | $ | 22,930 |  |  | 31 |  |  | 62 |  |  | $ | 22,899 |
As of December 31, 2016, the Company has $22,930 of held-to-maturity investments with contractual maturities less than one year.

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