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Cash and Investments (Details) - USD ($) $ in Thousands | Mar. 26, 2016 | Dec. 26, 2015
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 83,354 | $ 83,148
Gross Unrealized Gains | 8 | 2
Gross Unrealized Losses | (17) | (65)
Estimated Fair Market Value | 83,345 | 83,085
Commercial paper [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 699 | 1,884
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 699 | 1,884
U.S. Government agency securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 23,231 | 20,193
Gross Unrealized Gains | 4 | 1
Gross Unrealized Losses | (8) | (29)
Estimated Fair Market Value | 23,227 | 20,165
Corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 11,147 | 14,759
Gross Unrealized Gains | 2 | 0
Gross Unrealized Losses | (6) | (23)
Estimated Fair Market Value | 11,143 | 14,736
Cash [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 33,145 | 32,996
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 33,145 | 32,996
Money market funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 1,075 | 590
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 1,075 | 590
U.S. Treasury securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 6,971 | 4,411
Gross Unrealized Gains | 2 | 0
Gross Unrealized Losses | 0 | (10)
Estimated Fair Market Value | 6,973 | 4,401
Commercial paper and corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 4,452 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Market Value | 4,452 |
Commercial paper and corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost |  | 4,568
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated Fair Market Value |  | 4,568
Municipal securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 2,634 | 3,747
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (3) | (3)
Estimated Fair Market Value | $ 2,631 | $ 3,745

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