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Cash and Investments (Tables) | 9 Months Ended
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Sep. 24, 2016
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 24, 2016 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash |  | $ | 32,337 |  |  | $ | — |  |  | $ | — |  |  |  | 32,337 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 840 |  |  |  | — |  |  |  | — |  |  |  | 840 |
Commercial paper and corporate debt securities |  |  | 4,245 |  |  |  | — |  |  |  | (1 | ) |  |  | 4,244 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | 6,935 |  |  |  | 9 |  |  |  | — |  |  |  | 6,944 |
U.S. Government agency securities |  |  | 14,301 |  |  |  | 11 |  |  |  | — |  |  |  | 14,312 |
Certificate of deposits |  |  | 15,997 |  |  |  | 11 |  |  |  | — |  |  |  | 16,008 |
Commercial paper |  |  | 23,845 |  |  |  | 3 |  |  |  | — |  |  |  | 23,848 |
Municipal securities |  |  | 765 |  |  |  | — |  |  |  | — |  |  |  | 765 |
Corporate debt securities |  |  | 11,762 |  |  |  | — |  |  |  | (1 | ) |  |  | 11,761 |
Asset-backed securities |  |  | 7,470 |  |  |  | — |  |  |  | (2 | ) |  |  | 7,468 |
Total cash, cash equivalents, and marketable securities |  | $ | 118,497 |  |  | $ | 34 |  |  | $ | (4 | ) |  | $ | 118,527 |
|  | 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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | 4,411 |  |  |  | — |  |  |  | (10 | ) |  |  | 4,401 |
U.S. Government agency securities |  |  | 20,193 |  |  |  | 1 |  |  |  | (29 | ) |  |  | 20,165 |
Commercial paper |  |  | 1,884 |  |  |  | — |  |  |  | — |  |  |  | 1,884 |
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 |

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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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