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Cash and Investments (Details) - USD ($) $ in Thousands | Jun. 25, 2016 | Dec. 26, 2015
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 95,957 | $ 83,148
Gross Unrealized Gains | 30 | 2
Gross Unrealized Losses | (3) | (65)
Estimated Fair Market Value | 95,984 | 83,085
Commercial paper [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 0 | 1,884
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 0 | 1,884
U.S. Government agency securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 23,913 | 20,193
Gross Unrealized Gains | 25 | 1
Gross Unrealized Losses | (1) | (29)
Estimated Fair Market Value | 23,937 | 20,165
Corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 9,587 | 14,759
Gross Unrealized Gains | 4 | 0
Gross Unrealized Losses | (2) | (23)
Estimated Fair Market Value | 9,589 | 14,736
Cash [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 45,651 | 32,996
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 45,651 | 32,996
Money market funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 14,381 | 590
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 14,381 | 590
U.S. Treasury securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 0 | 4,411
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | (10)
Estimated Fair Market Value | 0 | 4,401
Commercial paper and corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 0 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Market Value | 0 |
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 | 2,425 | 3,747
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | 0 | (3)
Estimated Fair Market Value | $ 2,426 | $ 3,745

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