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Cash and Investments (Tables) | 3 Months Ended
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Mar. 29, 2014
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 March 29, 2014 and December 28, 2013 (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Market Value
March 29, 2014 |  |  |  |  |  |  |
Cash | $ | 38,247 |  |  | — |  |  | $ | — |  |  | $ | 38,247 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 586 |  |  | — |  |  | — |  |  | 586 |
Marketable securities: |  |  |  |  |  |  |
Commercial paper and corporate debt securities | 800 |  |  | — |  |  | — |  |  | 800 |
U.S. Treasury securities | 5,022 |  |  | 1 |  |  | — |  |  | 5,023 |
U.S. Government agency securities | 11,768 |  |  | 6 |  |  | (2 | ) |  | 11,772 |
Municipal securities | 10,367 |  |  | 7 |  |  | (1 | ) |  | 10,373 |
Corporate debt securities | 21,238 |  |  | 5 |  |  | (7 | ) |  | 21,236 |
Total cash, cash equivalents, and marketable securities | $ | 88,028 |  |  | $ | 19 |  |  | $ | (10 | ) |  | $ | 88,037 |
December 28, 2013 |  |  |  |  |  |  |
Cash | $ | 43,139 |  |  | $ | — |  |  | $ | — |  |  | $ | 43,139 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 876 |  |  | — |  |  | — |  |  | 876 |
Commercial paper | 750 |  |  | — |  |  | — |  |  | 750 |
Marketable securities: |  |  |  |  |  |  |
U.S. Treasury Securities | 5,036 |  |  | — |  |  | — |  |  | 5,036 |
U.S. Government agency securities | 11,980 |  |  | 4 |  |  | (4 | ) |  | 11,980 |
Municipal securities | 9,756 |  |  | 11 |  |  | (4 | ) |  | 9,763 |
Corporate debt securities | 21,316 |  |  | 7 |  |  | (5 | ) |  | 21,318 |
Total cash, cash equivalents, and marketable securities | $ | 92,853 |  |  | $ | 22 |  |  | $ | (13 | ) |  | $ | 92,862 |

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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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