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Cash and Investments (Tables) | 12 Months Ended
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Dec. 26, 2015
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 the following dates (in thousands):
|  | December 26, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash |  | $ | 32,996 |  |  | $ | — |  |  | $ | — |  |  | $ | 32,996 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 590 |  |  |  | — |  |  |  | — |  |  |  | 590 |
Commercial paper and corporate debt securities |  |  | 4,568 |  |  |  | — |  |  |  | — |  |  |  | 4,568 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | 1,884 |  |  |  | — |  |  |  | — |  |  |  | 1,884 |
U.S. Treasury securities |  |  | 4,411 |  |  |  | — |  |  |  | (10 | ) |  |  | 4,401 |
U.S. Government agency securities |  |  | 20,193 |  |  |  | 1 |  |  |  | (29 | ) |  |  | 20,165 |
Municipal securities |  |  | 3,747 |  |  |  | 1 |  |  |  | (3 | ) |  |  | 3,745 |
Corporate debt securities |  |  | 14,759 |  |  |  | — |  |  |  | (23 | ) |  |  | 14,736 |
Total cash, cash equivalents, and marketable securities |  | $ | 83,148 |  |  | $ | 2 |  |  | $ | (65 | ) |  | $ | 83,085 |
|  | 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 and corporate debt securities |  |  | 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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