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Cash and Investments (Tables) | 9 Months Ended
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Sep. 26, 2015
Investments, Debt and Equity Securities [Abstract] |
Cash, cash equivalents and available-for-sale investments | The following tables present cash, cash equivalents, and available-for-sale investments as of the following dates (in thousands):
| September 26, 2015
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Market Value
Cash | $ | 34,485 |  |  | $ | — |  |  | $ | — |  |  | $ | 34,485 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 642 |  |  | — |  |  | — |  |  | 642 |
Commercial paper | 6,434 |  |  | — |  |  | — |  |  | 6,434 |
Marketable securities: |  |  |  |  |  |  |
Commercial paper | 1,498 |  |  | — |  |  | — |  |  | 1,498 |
U.S. Government agency securities | 21,668 |  |  | 17 |  |  | (1 | ) |  | 21,684 |
Municipal securities | 3,714 |  |  | 5 |  |  | (1 | ) |  | 3,718 |
Corporate debt securities | 16,168 |  |  | 3 |  |  | (6 | ) |  | 16,165 |
Total cash, cash equivalents, and marketable securities | $ | 84,609 |  |  | $ | 25 |  |  | $ | (8 | ) |  | $ | 84,626 |
| December 27, 2014
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Market Value
Cash | $ | 34,066 |  |  | $ | — |  |  | $ | — |  |  | $ | 34,066 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 610 |  |  | — |  |  | — |  |  | 610 |
Marketable securities: |  |  |  |  |  |  |
Commercial paper | 805 |  |  | — |  |  | — |  |  | 805 |
U.S. Treasury Securities | 2,498 |  |  | — |  |  | (1 | ) |  | 2,497 |
U.S. Government agency securities | 20,556 |  |  | 1 |  |  | (19 | ) |  | 20,538 |
Municipal securities | 3,755 |  |  | 1 |  |  | (7 | ) |  | 3,749 |
Corporate debt securities | 21,722 |  |  | 1 |  |  | (26 | ) |  | 21,697 |
Total cash, cash equivalents, and marketable securities | $ | 84,012 |  |  | $ | 3 |  |  | $ | (53 | ) |  | $ | 83,962 |

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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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