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Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
Investments [Abstract] |
Investments of marketable debt securities | The following table sets forth our investments in marketable debt securities at January 2, 2016 (in thousands). We did not hold any marketable debt securities at December 31, 2016.
| January 2, 2016
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Corporate bonds | $ | 7,532 |  |  | $ | — |  |  | $ | (19 | ) |  | $ | 7,513 |
U.S. Agency bonds | 2,497 |  |  | — |  |  | (1 | ) |  | 2,496 |
Municipal bonds | 5,114 |  |  | — |  |  | (3 | ) |  | 5,111 |
| $ | 15,143 |  |  | $ | — |  |  | $ | (23 | ) |  | $ | 15,120 |
Maturities of marketable debt securities | Maturities of marketable debt securities were as follows (in thousands):
|  |  | January 2, 2016
|  |  |  |  | Amortized Cost |  | Fair Value
Marketable debt securities – current (due in less than one year) |  |  |  |  | $ | 6,575 |  |  | $ | 6,567 |
Marketable debt securities – non-current (due in one to two years) |  |  |  |  | 8,568 |  |  | 8,553 |
|  |  |  |  | $ | 15,143 |  |  | $ | 15,120 |

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