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Cash and Investments (Tables) | 9 Months Ended
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Sep. 28, 2013
Investments, Debt and Equity Securities [Abstract] |
Cash, Cash Equivalents and Available-for-sale Investments | The following table presents cash, cash equivalents, and available-for-sale investments as of September 28, 2013, and December 29, 2012 (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Market Value
September 28, 2013 |  |  |  |  |  |  |
Cash | $ | 43,085 |  |  | $ | — |  |  | $ | — |  |  | $ | 43,085 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 748 |  |  | — |  |  | — |  |  | 748 |
Marketable securities: |  |  |  |  |  |  |
Commercial paper | 950 |  |  | — |  |  | — |  |  | 950 |
U.S. Treasury securities | 5,048 |  |  | — |  |  | — |  |  | 5,048 |
U.S. Government agency securities | 15,685 |  |  | 8 |  |  | (4 | ) |  | 15,689 |
Municipal securities | 8,546 |  |  | 11 |  |  | — |  |  | 8,557 |
Corporate debt securities | 18,803 |  |  | 16 |  |  | (6 | ) |  | 18,813 |
Total cash, cash equivalents, and short-term investments | $ | 92,865 |  |  | $ | 35 |  |  | $ | (10 | ) |  | $ | 92,890 |
December 29, 2012 |  |  |  |  |  |  |
Cash | $ | 60,206 |  |  | $ | — |  |  | $ | — |  |  | $ | 60,206 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 109 |  |  | — |  |  | — |  |  | 109 |
Commercial paper | 2,600 |  |  | — |  |  | — |  |  | 2,600 |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | 3,199 |  |  | — |  |  | — |  |  | 3,199 |
U.S. Treasury Securities | 4,996 |  |  | 1 |  |  | — |  |  | 4,997 |
U.S. Government agency securities | 15,567 |  |  | 6 |  |  | (2 | ) |  | 15,571 |
Municipal securities | 5,396 |  |  | 1 |  |  | (1 | ) |  | 5,396 |
Corporate debt securities | 17,837 |  |  | 2 |  |  | (9 | ) |  | 17,830 |
Total cash, cash equivalents, and short-term investments | $ | 109,910 |  |  | $ | 10 |  |  | $ | (12 | ) |  | $ | 109,908 |

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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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